Antarctica

Last updated

Antarctica
Antarctica (orthographic projection).svg
Area14,200,000 km2
5,500,000 sq mi [1]
Population1,000 to 5,000 (seasonal)
Population density<0.01/km2
<0.03/sq mi
Demonym Antarctic
Internet TLD .aq
Largest settlements
UN M49 code 010
Composite satellite image of Antarctica (2002) Antarctica 6400px from Blue Marble.jpg
Composite satellite image of Antarctica (2002)

Antarctica ( /ænˈtɑːrktɪkə/ ( Loudspeaker.svg listen )) [note 1] is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole. Antarctica is the fifth-largest continent, being about 40% larger than Europe, and has an area of 14,200,000 km2 (5,500,000 sq mi). Most of Antarctica is covered by the Antarctic ice sheet, with an average thickness of 1.9 km (1.2 mi).

Contents

Antarctica is, on average, the coldest, driest, and windiest of the continents, and it has the highest average elevation. It is mainly a polar desert, with annual precipitation of over 200 mm (8 in) along the coast and far less inland. About 70% of the world's freshwater reserves are frozen in Antarctica, which, if melted, would raise global sea levels by almost 60 metres (200 ft). Antarctica holds the record for the lowest measured temperature on Earth, −89.2 °C (−128.6 °F). The coastal regions can reach temperatures over 10 °C (50 °F) in summer. Native species of animals include mites, nematodes, penguins, seals and tardigrades. Where vegetation occurs, it is mostly in the form of lichen or moss.

The ice shelves of Antarctica were probably first seen in 1820, during a Russian expedition led by Fabian Gottlieb von Bellingshausen and Mikhail Lazarev. The decades that followed saw further exploration in French, American, and British expeditions. The first confirmed landing was by a Norwegian team in 1895. In the early 20th century, there were a few expeditions into the interior of the continent. British explorers were the first to reach the magnetic South Pole in 1909, and the geographic South Pole was first reached in 1911 by Norwegian explorers.

Antarctica is governed by about 30 countries, all of which are parties of the 1959 Antarctic Treaty System. According to the terms of the treaty, military activity, mining, nuclear explosions, and nuclear waste disposal are all prohibited in Antarctica. Tourism, fishing and research are the main human activities in and around Antarctica. During the summer months, about 5,000 people reside at research stations, a figure that drops to around 1,000 in the winter. Despite its remoteness, human activity has a significant impact on the continent via pollution, ozone depletion, and climate change.

Etymology

A speculative representation of Antarctica labelled as 'Terra Australis Incognita
' on Jan Janssonius's Zeekaart van het Zuidpoolgebied
(1657), Het Scheepvaartmuseum
code: nld promoted to code: nl 1657 map Polus Antarcticus.jpg
A speculative representation of Antarctica labelled as 'Terra Australis Incognita' on Jan Janssonius's Zeekaart van het Zuidpoolgebied (1657), Het Scheepvaartmuseum

The name given to the continent originates from the word antarctic, which comes from Middle French antartique or antarctique ('opposite to the Arctic') and, in turn, the Latin antarcticus ('opposite to the north'). Antarcticus is derived from the Greek ἀντι- ('anti-') and ἀρκτικός ('of the Bear', 'northern'). [4] The Greek philosopher Aristotle wrote in Meteorology about an "Antarctic region" in c.350 BCE. [5] The Greek geographer Marinus of Tyre reportedly used the name in his world map from the second century CE, now lost. The Roman authors Gaius Julius Hyginus and Apuleius used for the South Pole the romanised Greek name polus antarcticus, [6] from which derived the Old French pole antartike (modern pôle antarctique) attested in 1270, and from there the Middle English pol antartik, found first in a treatise written by the English author Geoffrey Chaucer. [4]

Until the discovery, belief by Europeans in the existence of a Terra Australis —a vast continent in the far south of the globe to balance the northern lands of Europe, Asia, and North Africa—had existed as an intellectual concept since classical antiquity. The belief of such a land lasted until the discovery of Australia. [7]

During the early 19th century, explorer Matthew Flinders doubted the existence of a detached continent south of Australia (then called New Holland) and thus advocated for the "Terra Australis" name to be used for Australia instead. [8] [9] In 1824, the colonial authorities in Sydney officially renamed the continent of New Holland to Australia, leaving the term "Terra Australis" unavailable as a reference to Antarctica. Over the following decades, geographers used phrases such as "the Antarctic Continent". They searched for a more poetic replacement, suggesting names such as Ultima and Antipodea. [10] Antarctica was adopted in the 1890s, with the first use of the name being attributed to the Scottish cartographer John George Bartholomew. [11]

Geography

Eastern Antarctica is to the right of the Transantarctic Mountains and Western Antarctica is to the left. Antarctica.svg
Eastern Antarctica is to the right of the Transantarctic Mountains and Western Antarctica is to the left.

Positioned asymmetrically around the South Pole and largely south of the Antarctic Circle (one of the five major circles of latitude that mark maps of the world), Antarctica is surrounded by the Southern Ocean. [note 2] Rivers exist in Antarctica, the longest being the Onyx. Antarctica covers more than 14.2 million km2 (5,500,000 sq mi), making it the fifth-largest continent, slightly less than 1.5 times the area of the United States. Its coastline is almost 18,000 km (11,200 mi) long: [1] as of 1983, of the four coastal types, 44% of the coast is floating ice in the form of an ice shelf, 38% consists of ice walls that rest on rock, 13% is ice streams or the edge of glaciers, and the remaining 5% is exposed rock. [13]

The lakes that lie at the base of the continental ice sheet occur mainly in the McMurdo Dry Valleys or various oases. [14] Lake Vostok, discovered beneath Russia's Vostok Station, is the largest subglacial lake globally and one of the largest lakes in the world. It was once believed that the lake had been sealed off for millions of years, but scientists now estimate its water is replaced by the slow melting and freezing of ice caps every 13,000 years. [15] During the summer, the ice at the edges of the lakes can melt, and liquid moats temporarily form. Antarctica has both saline and freshwater lakes. [14]

Antarctica is divided into West Antarctica and East Antarctica by the Transantarctic Mountains, which stretch from Victoria Land to the Ross Sea. [16] [17] The vast majority of Antarctica is covered by the Antarctic ice sheet, which averages 1.9 km (1.2 mi) in thickness. [18] The ice sheet extends to all but a few oases, which, with the exception of the McMurdo Dry Valleys, are located in coastal areas. [19] Several Antarctic ice streams flow to one of the many Antarctic ice shelves, a process described by ice-sheet dynamics. [20]

Vinson Massif from the northwest, the highest peak in Antarctica Mount Vinson from NW at Vinson Plateau by Christian Stangl (flickr).jpg
Vinson Massif from the northwest, the highest peak in Antarctica

East Antarctica comprises Coats Land, Queen Maud Land, Enderby Land, Mac. Robertson Land, Wilkes Land, and Victoria Land. All but a small portion of the region lies within the Eastern Hemisphere. East Antarctica is largely covered by the East Antarctic Ice Sheet. [21] There are numerous islands surrounding Antarctica, most of which are volcanic and very young by geological standards. [22] The most prominent exceptions to this are the islands of the Kerguelen Plateau, the earliest of which formed around 40 Ma. [22] [23]

Vinson Massif, in the Ellsworth Mountains, is the highest peak in Antarctica at 4,892 m (16,050 ft). [24] Mount Erebus on Ross Island is the world's southernmost active volcano and erupts around 10 times each day. Ash from eruptions has been found 300 kilometres (190 mi) from the volcanic crater. [25] There is evidence of a large number of volcanoes under the ice, which could pose a risk to the ice sheet if activity levels were to rise. [26] The ice dome known as Dome Argus in East Antarctica is the highest Antarctic ice feature, at 4,091 metres (13,422 ft). It is one of the world's coldest and driest places—temperatures there may reach as low as −90 °C (−130 °F), and the annual precipitation is 1–3 cm (0.39–1.18 in). [27]

Geologic history

From the end of the Neoproterozoic era to the Cretaceous, Antarctica was part of the supercontinent Gondwana. [28] Modern Antarctica was formed as Gondwana gradually broke apart beginning around 183 Ma. [29] For a large proportion of the Phanerozoic, Antarctica had a tropical or temperate climate, and it was covered in forests. [30]

Palaeozoic era (540–250 Ma)

Glossopteris sp. leaf from the Permian of Antarctica Glossopteris sp. (fossil leaf) (Permian; Antarctica) 1 (49063572172) (cropped).jpg
Glossopteris sp. leaf from the Permian of Antarctica

During the Cambrian period, Gondwana had a mild climate. [31] West Antarctica was partially in the Northern Hemisphere, and during the time, large amounts of sandstones, limestones, and shales were deposited. East Antarctica was at the equator, where seafloor invertebrates and trilobites flourished in the tropical seas. By the start of the Devonian period (416  Ma), Gondwana was in more southern latitudes, and the climate was cooler, though fossils of land plants are known from then. Sand and silts were laid down in what is now the Ellsworth, Horlick and Pensacola Mountains.

Antarctica became glaciated during the Late Paleozoic icehouse beginning at the end of the Devonian period (360 Ma), though glaciation would substantially increase during the late Carboniferous. It drifted closer to the South Pole, and the climate cooled, though flora remained. [32] After deglaciation during the latter half of the Early Permian, the land became dominated by glossopterids (an extinct group of seed plants with no close living relatives), most prominently Glossopteris, a tree interpreted as growing in waterlogged soils, which formed extensive coal deposits. Other plants found in Antarctica during the Permian include Cordaitales, sphenopsids, ferns, and lycophytes. [33] At the end of the Permian, the climate became drier and hotter over much of Gondwana, and the glossopterid forest ecosystems collapsed, as part of the End-Permian mass extinction. [33] [34] There is no evidence of any tetrapods having lived in Antarctica during the Paleozoic. [35]

Mesozoic era (250–66 Ma)

The continued warming dried out much of Gondwana. During the Triassic, Antarctica was dominated by seed ferns (pteridosperms) belonging to the genus Dicroidium, which grew as trees. Other associated Triassic flora included ginkgophytes, cycadophytes, conifers, and sphenopsids. [36] Tetrapods first appeared in Antarctica during the early Triassic, with the earliest known fossils found in the Fremouw Formation of the Transantarctic Mountains. [35] Synapsids (also known as "mammal-like reptiles") included species such as Lystrosaurus , and were common during the Early Triassic. [37]

The Antarctic Peninsula began to form during the Jurassic period (206–146 Ma). [38] Ginkgo trees, conifers, Bennettitales, horsetails, ferns and cycads were plentiful during the time. [39] In West Antarctica, coniferous forests dominated throughout the Cretaceous period (146–66 Ma), though southern beech trees ( Nothofagus ) became prominent towards the end of the Cretaceous. [40] [41] Ammonites were common in the seas around Antarctica, and dinosaurs were also present, though only a few Antarctic dinosaur genera ( Cryolophosaurus and Glacialisaurus , from the Early Jurassic Hanson Formation of the Transantarctic Mountains, [42] and Antarctopelta , Trinisaura, Morrosaurus and Imperobator from Late Cretaceous of the Antarctic Peninsula) have been described. [43] [44] [45] [46]

Gondwana breakup (160–15 Ma)

Opening of western Indian Ocean 150 Ma.png
Opening of South Atlantic 126 Ma.png
Opening of South Atlantic 83 Ma.png
Breakup of Gondwana at c.150  Ma (left), c. 126 Ma (centre) and at c. 83 Ma (right) [note 3]

Africa separated from Antarctica in the Jurassic around 160 Ma, followed by the Indian subcontinent in the early Cretaceous (about 125 Ma). [47] During the early Paleogene, Antarctica remained connected to South America via the Isthmus of Scotia as well as to southeastern Australia. Fauna from the La Meseta Formation in the Antarctic Peninsula, dating to the Eocene, is very similar to equivalent South American faunas; with marsupials, xenarthrans, litoptern, and astrapotherian ungulates, as well as gondwanatheres and meridiolestidans. [48] [49] Marsupials are thought to have dispersed into Australia via Antarctica by the early Eocene. [50]

Around 53 Ma, Australia-New Guinea separated from Antarctica, opening the Tasmanian Passage. [51] The Drake Passage opened between Antarctica and South America around 30 Ma, resulting in the creation of the Antarctic Circumpolar Current that completely isolated the continent. [52] Models of Antarctic geography suggest that this current, as well as a feedback loop caused by lowering CO2 levels, caused the creation of small yet permanent polar ice caps. As CO2 levels declined further the ice began to spread rapidly, replacing the forests that until then had covered Antarctica. [53] Since about 15 Ma, the continent has been mostly covered with ice. [54]

Present day

The Antarctic Plate The Antarctic tectonic plate.svg
The Antarctic Plate

The geology of Antarctica, largely obscured by the continental ice sheet, [55] is being revealed by techniques such as remote sensing, ground-penetrating radar, and satellite imagery. [56] Geologically, West Antarctica closely resembles the South American Andes. [57] The Antarctic Peninsula was formed by geologic uplift and the transformation of sea bed sediments into metamorphic rocks. [58]

West Antarctica was formed by the merging of several continental plates, which created a number of mountain ranges in the region, the most prominent being the Ellsworth Mountains. The presence of the West Antarctic Rift System has resulted in volcanism along the border between West and East Antarctica, as well as the creation of the Transantarctic Mountains. [59]

East Antarctica is geologically varied. Its formation began during the Archean Eon (4,000 Ma2,500 Ma), and stopped during the Cambrian Period. [60] It is built on a craton of rock, which is the basis of the Precambrian Shield. [61] On top of the base are coal and sandstones, limestones, and shales that were laid down during the Devonian and Jurassic periods to form the Transantarctic Mountains. [62] In coastal areas such as the Shackleton Range and Victoria Land, some faulting has occurred. [63] [64]

Coal was first recorded in Antarctica near the Beardmore Glacier by Frank Wild on the Nimrod Expedition in 1907, and low-grade coal is known to exist across many parts of the Transantarctic Mountains. [65] The Prince Charles Mountains contain deposits of iron ore. [66] There are oil and natural gas fields in the Ross Sea. [67]

Climate

AntarcticaSummer.jpg
Temperate conditions near the coast in December

Antarctica is the coldest, windiest, and driest of Earth's continents. [1] The lowest natural air temperature ever recorded on Earth was −89.2 °C (−128.6 °F) at the Russian Vostok Station in Antarctica on 21 July 1983. [68] A lower air temperature of −94.7 °C (−138.5 °F) was recorded in 2010 by satellite—however, it may have been influenced by ground temperatures and was not recorded at a height of 2 m (7 ft) above the surface as required for official air temperature records. [69] Average temperatures can reach a minimum of between −80 °C (−112 °F) in the interior of the continent during winter and a maximum of over 10 °C (50 °F) near the coast in summer. [70]

Antarctica is a polar desert with little precipitation; the continent receives an average equivalent to about 150 mm (6 in) of water per year, mostly in the form of snow. The interior is dryer and receives less than 50 mm (2 in) per year, whereas the coastal regions typically receive more than 200 mm (8 in). [71] In a few blue-ice areas, the wind and sublimation remove more snow than is accumulated by precipitation. [72] In the dry valleys, the same effect occurs over a rock base, leading to a barren and desiccated landscape. [73] Antarctica is colder than the Arctic region, as much of Antarctica is over 3,000 m (9,800 ft) above sea level, where air temperatures are colder. The relative warmth of the Arctic Ocean is transferred through the Arctic sea ice and moderates temperatures in the Arctic region. [74]

Regional differences

East Antarctica is colder than its western counterpart because of its higher elevation. Weather fronts rarely penetrate far into the continent, leaving the centre cold and dry, with moderate wind speeds. Heavy snowfalls are common on the coastal portion of Antarctica, where snowfalls of up to 1.22 m (48 in) in 48 hours have been recorded. At the continent's edge, strong katabatic winds off of the polar plateau often blow at storm force. During the summer, more solar radiation reaches the surface at the South Pole than at the equator because of the 24 hours of sunlight received there each day. [1]

Climate change

AntarcticaTemps 1957-2006.jpg
The warming trend for Antarctica from 1957 to 2006, based on the analysis of weather station and satellite data; dark tints over West Antarctica indicate that the region warmed most per decade.
Scale for chart (Antarctica warming 1957-2006).svg

Over the second half of the 20th century, the Antarctic Peninsula was the fastest-warming place on Earth, closely followed by West Antarctica, but temperatures rose less rapidly during the early 21st century. [75] Conversely, the South Pole, located in East Antarctica, barely warmed during much of the 20th century, but temperatures rose three times the global average between 1990 and 2020. [76] In February 2020, the continent recorded its highest temperature of 18.3 °C (64.9 °F), which was 0.8 °C (1.4 °F) higher than the previous record attained in March 2015. [77]

There is some evidence that surface warming in Antarctica is due to human greenhouse gas emissions, [78] but it is difficult to determine due to internal variability. [79] A main component of climate variability in Antarctica is the Southern Annular Mode (a low-frequency mode of atmospheric variability of the Southern Hemisphere), which showed strengthened winds around Antarctica in the summer of the later decades of the 20th century, associated with cooler temperatures over the continent. The trend was at a scale unprecedented over the last 600 years; the most dominant driver of the mode of variability is likely the depletion of ozone above the continent. [80]

Glaciers and floating ice

Pine Island Glacier, photographed in November 2011 Pine Island Glacier - NASA satellite image Nov 2011.jpg
Pine Island Glacier, photographed in November 2011

Precipitation in Antarctica occurs in the form of snow, which accumulates and forms the giant ice sheet that covers the continent. [81] Under the force of gravity, the ice flows towards the coast. The ice then moves into the ocean, often forming vast floating ice shelves. These shelves can melt or form icebergs that eventually disintegrate when they reach warmer ocean waters. [82]

Sea ice and ice shelves

Sea ice extent expands annually during the Antarctic winter, but most of it melts in the summer. [83] The ice is formed from the ocean, and does not contribute to changes in sea level. [84] The average extent of sea ice around Antarctica has changed little since satellites began to observe the Earth's surface in 1978; which is in contrast with the Arctic, where there has been rapid sea ice loss. A possible explanation is that thermohaline circulation transports warmed water to deeper layers in the Southern Ocean so that the surface remains relatively cool. [85]

The melting of the ice shelves does not contribute much to sea level rise, as the floating ice displaces its own mass of water, but the ice shelves act to stabilize the land ice. They are vulnerable to warming water, which has caused large ice shelves to collapse into the ocean. [86] The loss of ice shelf "buttressing" has been identified as the major cause of ice loss on the West Antarctic ice sheet, but has also been observed around the East Antarctic ice sheet. [87]

In 2002 the Antarctic Peninsula's Larsen-B ice shelf collapsed. [88] In early 2008, about 570 km2 (220 sq mi) of ice from the Wilkins Ice Shelf on the southwest part of the peninsula collapsed, putting the remaining 15,000 km2 (5,800 sq mi) of the ice shelf at risk. The ice was being held back by a "thread" of ice about 6 km (4 mi) wide, [89] [90] prior to its collapse in 2009. [91] As of 2022, the two most rapidly thinning ice shelves are those in front of the Pine Island and Thwaites glaciers. Both ice shelves act to stabilise the glaciers that feed into them. [92]

Ice sheet loss and sea level rise

Ice mass loss since 2002 20201210 Antarctica ice mass variation - NASA GRACE-en.svg
Ice mass loss since 2002

Antarctica contains about 90% of the world's ice. If all of this ice were melted, global sea levels would rise about 58 m (190 ft). [93] In addition, Antarctica stores around 70% of global freshwater as ice. [94] The continent is losing mass due to the increased flow of its glaciers toward the ocean. [95] The loss of mass from Antarctica's ice sheets is partially offset by additional snow falling back onto it. [96] A 2018 systematic review study estimated that ice loss across the entire continent was 43 gigatonnes (Gt) per year on average during the period from 1992 to 2002, but accelerated to an average of 220 Gt per year during the five years from 2012 to 2017. [97] Antarctica's total contribution to sea level rise has been estimated to be 8 to 14 mm (0.31 to 0.55 in). [96] [95]

Most of the ice loss has taken place on the Antarctic Peninsula and West Antarctica. [98] Estimates of the mass balance of the East Antarctic Ice Sheet as a whole range from slightly positive to slightly negative. [95] [99] Increased ice outflow has been observed in some regions of East Antarctica, particularly at Wilkes Land. [95]

Future projections of ice loss depend on the speed of climate change mitigation and are uncertain. Tipping points have been identified in some regions; when a certain threshold warming is reached, these regions may start melting at a significantly faster rate. If average temperatures were to begin to fall, the ice would not immediately be restored. [100] A tipping point for the West Antarctic ice sheet is estimated to be between 1.5 and 2.0 °C (2.7 and 3.6 °F) of global warming. A full collapse would likely not take place unless warming reaches between 2 and 3 °C (3.6 and 5.4 °F), and may occur within centuries under pessimistic assumptions. This full collapse would lead to 2 to 5 meters (6.6 to 16.4 feet) of sea level rise. At 3 °C, parts of the East Antarctic ice sheet are also projected to be fully lost, and total ice loss would lead to around 6 to 12 meters (20 to 39 feet) or more of sea level rise. [101]

Ozone depletion

Image of the largest hole in the ozone layer recorded, in September 2006 NASA and NOAA Announce Ozone Hole is a Double Record Breaker.png
Image of the largest hole in the ozone layer recorded, in September 2006

Scientists have studied the ozone layer in the atmosphere above Antarctica since the 1970s. In 1985, British scientists, working on data they had gathered at Halley Research Station on the Brunt Ice Shelf, discovered a large area of low ozone concentration over Antarctica. [102] [103] The 'ozone hole' covers almost the whole continent and was at its largest in September 2006; [104] the longest-lasting event occurred in 2020. [105] The depletion is caused by the emission of chlorofluorocarbons and halons into the atmosphere, which causes ozone to break down into other gases. [106] The extreme cold conditions of Antarctica allow polar stratospheric clouds to form. The clouds act as catalysts for chemical reactions, which eventually lead to the destruction of ozone. [107] The 1987 Montreal Protocol has restricted the emissions of ozone-depleting substances. The ozone hole above Antarctica is predicted to slowly disappear; by the 2060s, levels of ozone are expected to have returned to values last recorded in the 1980s. [108]

The ozone depletion can cause a cooling of around 6 °C (11 °F) in the stratosphere. The cooling strengthens the polar vortex and so prevents the outflow of the cold air near the South Pole, which in turn cools the continental mass of the East Antarctic ice sheet. The peripheral areas of Antarctica, especially the Antarctic Peninsula, are then subjected to higher temperatures, which accelerate the melting of the ice. [103] Models suggest that ozone depletion and the enhanced polar vortex effect may also account for the period of increasing sea ice extent, lasting from when observation started in the late 1970s until 2014. Since then, the coverage of Antarctic sea ice has decreased rapidly. [109] [110]

Biodiversity

Most species in Antarctica seem to be the descendants of species that lived there millions of years ago. As such, they must have survived multiple glacial cycles. The species survived the periods of extremely cold climate in isolated warmer areas, such as those with geothermal heat or areas that remained ice-free throughout the colder climate. [111]

Animals

Emperor penguins with juveniles Kaiserpinguine mit Jungen.jpg
Emperor penguins with juveniles

Invertebrate life of Antarctica includes species of microscopic mites such as Alaskozetes antarcticus , lice, nematodes, tardigrades, rotifers, krill and springtails. The few terrestrial vertebrates are limited to the sub-Antarctic islands. [112] The flightless midge Belgica antarctica , the largest purely terrestrial animal in Antarctica, reaches 6 mm (14 in) in size. [113]

Antarctic krill, which congregates in large schools, is the keystone species of the ecosystem of the Southern Ocean, being an important food organism for whales, seals, leopard seals, fur seals, squid, icefish, and many bird species, such as penguins and albatrosses. [114] Some species of marine animals exist and rely, directly or indirectly, on phytoplankton. Antarctic sea life includes penguins, blue whales, orcas, colossal squids and fur seals. [115] The Antarctic fur seal was very heavily hunted in the 18th and 19th centuries for its pelt by seal hunters from the United States and the United Kingdom. [116] Leopard seals are apex predators in the Antarctic ecosystem and migrate across the Southern Ocean in search of food. [117]

There are approximately 40 bird species that breed on or close to Antarctica, including species of petrels, penguins, cormorants, and gulls. Various other bird species visit the ocean around Antarctica, including some that normally reside in the Arctic. [118] The emperor penguin is the only penguin that breeds during the winter in Antarctica; it and the Adélie penguin breed farther south than any other penguin. [115]

A Census of Marine Life by some 500 researchers during the International Polar Year was released in 2010. The research found that more than 235 marine organisms live in both polar regions, having bridged the gap of 12,000 km (7,456 mi). Large animals such as some cetaceans and birds make the round trip annually. Smaller forms of life, such as sea cucumbers and free-swimming snails also found in both polar oceans. Factors that may aid in their distribution include temperature differences between the deep ocean at the poles and the equator of no more than 5 °C (9 °F) and the major current systems or marine conveyor belts which are able to transport eggs and larva. [119]

Fungi

Orange lichen (Caloplaca) growing on the Yalour Islands, Wilhelm Archipelago Islas Yalour 7, liquen.jpg
Orange lichen (Caloplaca) growing on the Yalour Islands, Wilhelm Archipelago

About 1,150 species of fungi have been recorded in the Antarctic region, of which about 750 are non-lichen-forming. [120] [121] Some of the species, having evolved under extreme conditions, have colonized structural cavities within porous rocks and have contributed to shaping the rock formations of the McMurdo Dry Valleys and surrounding mountain ridges. [122]

The simplified morphology of such fungi, along with their similar biological structures, metabolism systems capable of remaining active at very low temperatures, and reduced life cycles, make them well suited to such environments. Their thick-walled and strongly melanised cells make them resistant to UV radiation. [122]

The same features can be observed in algae and cyanobacteria, suggesting that they are adaptations to the conditions prevailing in Antarctica. This has led to speculation that life on Mars might have been similar to Antarctic fungi, such as Cryomyces antarcticus and Cryomyces minteri . [122] Some of the species of fungi, which are apparently endemic to Antarctica, live in bird dung, and have evolved so they can grow inside extremely cold dung, but can also pass through the intestines of warm-blooded animals. [123] [124]

Plants

Throughout its history, Antarctica has seen a wide variety of plant life. In the Cretaceous, it was dominated by a fern-conifer ecosystem, which changed into a temperate rainforest by the end of that period. During the colder Neogene (17–2.5 Ma), a tundra ecosystem replaced the rainforests. The climate of present-day Antarctica does not allow extensive vegetation to form. [125] A combination of freezing temperatures, poor soil quality, and a lack of moisture and sunlight inhibit plant growth, causing low species diversity and limited distribution. The flora largely consists of bryophytes (25 species of liverworts and 100 species of mosses). There are three species of flowering plants, all of which are found in the Antarctic Peninsula: Deschampsia antarctica (Antarctic hair grass), Colobanthus quitensis (Antarctic pearlwort) and the non-native Poa annua (annual bluegrass). [126]

Other organisms

Of the 700 species of algae in Antarctica, around half are marine phytoplankton. Multicoloured snow algae are especially abundant in the coastal regions during the summer. [127] Bacteria have been found as deep as 800 m (0.50 mi) under the ice. [128] It is thought to be likely that there exists a native bacterial community within the subterranean water body of Lake Vostok. [129] The existence of life there is thought to strengthen the argument for the possibility of life on Jupiter's moon Europa, which may have water beneath its water-ice crust. [130] There exists a community of extremophile bacteria in the highly alkaline waters of Lake Untersee. [131] [132] The prevalence of highly resilient creatures in such inhospitable areas could further bolster the argument for extraterrestrial life in cold, methane-rich environments. [133]

Conservation and environmental protection

Refuse littering the shoreline at Bellingshausen Station on King George Island, photographed in 1992 Antarctica, pollution, environment, Russia, Bellingshausen 1.JPG
Refuse littering the shoreline at Bellingshausen Station on King George Island, photographed in 1992
A whale in the Southern Ocean Whale Sanctuary Wilhelmina Bay Antarctica Humpback Whale 6 (46421727295).jpg
A whale in the Southern Ocean Whale Sanctuary

The first international agreement to protect Antarctica's biodiversity was adopted in 1964. [134] The overfishing of krill (an animal that plays a large role in the Antarctic ecosystem) led officials to enact regulations on fishing. The Convention for the Conservation of Antarctic Marine Living Resources, an international treaty that came into force in 1980, regulates fisheries, aiming to preserve ecological relationships. [1] Despite these regulations, illegal fishing—particularly of the highly prized Patagonian toothfish which is marketed as Chilean sea bass in the U.S.—remains a problem. [135]

In analogy to the 1980 treaty on sustainable fishing, countries led by New Zealand and the United States negotiated a treaty on mining. This Convention on the Regulation of Antarctic Mineral Resource Activities was adopted in 1988. After a strong campaign from environmental organisations, first Australia and then France decided not to ratify the treaty. [136] Instead, countries adopted the Protocol on Environmental Protection to the Antarctic Treaty (the Madrid Protocol), which entered into force in 1998. [137] The Madrid Protocol bans all mining, designating the continent as a "natural reserve devoted to peace and science". [138]

The pressure group Greenpeace established a base on Ross Island from 1987 to 1992 as part of its attempt to establish the continent as a World Park. [139] The Southern Ocean Whale Sanctuary was established in 1994 by the International Whaling Commission. It covers 50 million km2 (19 million sq mi) and completely surrounds the Antarctic continent. All commercial whaling is banned in the zone, though Japan has continued to hunt whales in the area, ostensibly for research purposes. [140]

Despite these protections, the biodiversity in Antarctica is still at risk from human activities. Specially protected areas cover less than 2% of the area and provide better protection for animals with popular appeal than for less visible animals. [134] There are more terrestrial protected areas than marine protected areas. [141] Ecosystems are impacted by local and global threats, notably pollution, the invasion of non-native species, and the various effects of climate change. [134]

History of exploration

Captain James Cook's ships, HMS Resolution and Adventure, crossed the Antarctic Circle on 17 January 1773, in December 1773, and again in January 1774. [142] Cook came within about 120 km (75 mi) of the Antarctic coast before retreating in the face of field ice in January 1773. [143] In 1775, he called the existence of a polar continent "probable," and in another copy of his journal he wrote: "[I] firmly believe it and it's more than probable that we have seen a part of it". [144]

19th century

Adelie Land, depicted by Jules Dumont d'Urville in his Voyage au Pole Sud (1846) Atlas pittoresque pl 169.jpg
Adélie Land, depicted by Jules Dumont d'Urville in his Voyage au Pôle Sud (1846)

Sealers were among the earliest to go closer to the Antarctic landmass, perhaps in the earlier part of the 19th century. The oldest known human remains in the Antarctic region was a skull, dated from 1819 to 1825, that belonged to a young woman on Yamana Beach at the South Shetland Islands. The woman, who was likely to have been part of a sealing expedition, was found in 1985. [145]

The first person to see Antarctica or its ice shelf was long thought to have been the British sailor Edward Bransfield, a captain in the Royal Navy, who discovered the tip of the Antarctic peninsula on 30 January 1820. However, a captain in the Imperial Russian Navy, Fabian Gottlieb von Bellingshausen, recorded seeing an ice shelf on 27 January. [146] The American sealer Nathaniel Palmer, whose sealing ship was in the region at this time, may also have been the first to sight the Antarctic Peninsula. [147]

The First Russian Antarctic Expedition, led by Bellingshausen and Mikhail Lazarev on the 985-ton sloop-of-war Vostok and the 530-ton support vessel Mirny, reached a point within 32 km (20 mi) of Queen Maud Land and recorded sighting an ice shelf at 69°21′28″S2°14′50″W / 69.35778°S 2.24722°W / -69.35778; -2.24722 . [148] on 27 January 1820, [149] [note 4] The sighting happened three days before Bransfield sighted the land of the Trinity Peninsula of Antarctica, as opposed to the ice of an ice shelf, and 10 months before Palmer did so in November 1820. The first documented landing on Antarctica was by the American sealer John Davis, apparently at Hughes Bay on 7 February 1821, although some historians dispute this claim, as there is no evidence Davis landed on the Antarctic continent rather than an offshore island. [150] [151]

On 22 January 1840, two days after the discovery of the coast west of the Balleny Islands, some members of the crew of the 18371840 expedition of the French explorer Jules Dumont d'Urville disembarked on the Dumoulin Islands, off the coast of Adélie Land, where they took some mineral, algae, and animal samples erected the French flag and claimed French sovereignty over the territory. [152] The American captain Charles Wilkes led an expedition in 1838–1839 and was the first to claim he had discovered the continent. [153] The British naval officer James Clark Ross failed to realise that what he referred to as "the various patches of land recently discovered by the American, French and English navigators on the verge of the Antarctic Circle" were connected to form a single continent. [154] [155] [156] [note 5] The American explorer Mercator Cooper landed on East Antarctica on 26 January 1853. [159]

The first confirmed landing on the continental mass of Antarctica occurred in 1895 when the Norwegian-Swedish whaling ship Antarctic reached Cape Adare. [160]

20th century

The Nimrod Expedition of 1907-1909 (left to right): Frank Wild, Ernest Shackleton, Eric Marshall and Jameson Adams TheSouthernParty (cropped).jpg
The Nimrod Expedition of 1907–1909 (left to right): Frank Wild, Ernest Shackleton, Eric Marshall and Jameson Adams

During the Nimrod Expedition led by the British explorer Ernest Shackleton in 1907, parties led by Edgeworth David became the first to climb Mount Erebus and to reach the south magnetic pole. Douglas Mawson, who assumed the leadership of the Magnetic Pole party on their perilous return, retired in 1931. [161] Between December 1908 and February 1909: Shackleton and three members of his expedition became the first humans to traverse the Ross Ice Shelf, the first to cross the Transantarctic Mountains (via the Beardmore Glacier), and the first to set foot on the south Polar Plateau. On 14 December 1911, an expedition led by Norwegian explorer Roald Amundsen from the ship Fram became the first to reach the geographic South Pole, using a route from the Bay of Whales and up the Axel Heiberg Glacier. [162] One month later, the doomed Terra Nova Expedition reached the pole. [163]

The American explorer Richard E. Byrd led four expeditions to Antarctica during the 1920s, 1930s, and 1940s, using the first mechanised tractors. His expeditions conducted extensive geographical and scientific research, and he is credited with surveying a larger region of the continent than any other explorer. [164] In 1937, Ingrid Christensen became the first woman to step onto the Antarctic mainland. [165] Caroline Mikkelsen had landed on an island of Antarctica, earlier in 1935. [166]

The South Pole was next reached on 31 October 1956, when a U.S. Navy group led by Rear Admiral George J. Dufek successfully landed an aircraft there. [167] Six women were flown to the South Pole as a publicity stunt in 1969. [168] [note 6] In the summer of 19961997, Norwegian explorer Børge Ousland became the first person to cross Antarctica alone from coast to coast, helped by a kite on parts of the journey. [169] Ousland holds the record for the fastest unsupported journey to the South Pole, taking 34 days. [170]

Population

The first semi-permanent inhabitants of regions near Antarctica (areas situated south of the Antarctic Convergence) were British and American sealers who used to spend a year or more on South Georgia, from 1786 onward. During the whaling era, which lasted until 1966, the population of the island varied from over 1,000 in the summer (over 2,000 in some years) to some 200 in the winter. Most of the whalers were Norwegian, with an increasing proportion from Britain. [171] [note 7]

The "ceremonial" South Pole, at Amundsen-Scott Station AmundsenScottSuedpolStation.jpg
The "ceremonial" South Pole, at Amundsen–Scott Station

The continent of Antarctica has never had a permanent resident population, although staffed research stations are continuously maintained. [172] The number of people conducting and supporting scientific research and other work on the continent and its nearby islands varies from about 1,000 in winter to about 5,000 in the summer. Some of the research stations are staffed year-round, the winter-over personnel typically arriving from their home countries for a one-year assignment. The Russian Orthodox Holy Trinity Church at the Bellingshausen Station on King George Island opened in 2004; it is manned year-round by one or two priests, who are similarly rotated every year. [173] [174]

The first child born in the southern polar region was a Norwegian girl, Solveig Gunbjørg Jacobsen, born in Grytviken on 8 October 1913. [175] Emilio Marcos Palma was the first person born south of the 60th parallel south and the first to be born on the Antarctic mainland at the Esperanza Base of the Argentine Army. [176]

The Antarctic Treaty prohibits any military activity in Antarctica, including the establishment of military bases and fortifications, military manoeuvres, and weapons testing. Military personnel or equipment are permitted only for scientific research or other peaceful purposes. [177] Operation 90 by the Argentine military in 1965 was conducted to strengthen Argentina's claim in Antarctica. [178] [ better source needed ]

Politics

The U.S. delegate Herman Phleger signs the Antarctic Treaty in December 1959. Senate 1960-img1.jpg
The U.S. delegate Herman Phleger signs the Antarctic Treaty in December 1959.

In 1539, the King of Spain, Charles V, created the Governorate of Terra Australis, which encompassed lands south of the Strait of Magellan and thus theoretically Antarctica, [179] granting this Govenorate to Pedro Sancho de la Hoz, [180] [181] who in 1540 transferred the title to the conquistador Pedro de Valdivia. [182] Spain claimed all the territories to the south of the Strait of Magellan until the South Pole, with eastern and western borders to these claims specified in the Treaty of Tordesillas and Zaragoza respectively. In 1555 the claim was incorporated to Chile. [183]

Antarctica's status is regulated by the 1959 Antarctic Treaty and other related agreements, collectively called the Antarctic Treaty System. Antarctica is defined as all land and ice shelves south of 60° S for the purposes of the Treaty System. [1] The treaty was signed by twelve countries, including the Soviet Union, the United Kingdom, Argentina, Chile, Australia, and the United States. Since 1959, a further 42 countries have acceeded to the treaty. Countries can participate in decision-making if they can demonstrate that they do significant research on Antarctica; as of 2022, 29 countries have this 'consultative status'. [184] Decisions are based on consensus, instead of a vote. The treaty set aside Antarctica as a scientific preserve and established freedom of scientific investigation and environmental protection. [185]

Territorial claims

Map of the Spanish Governorate of Terra Australis (1539-1555), the first territorial claim over the lands near the South Pole; later it was incorporated into the Governorate of Chile. Governorate of Terra Australis (1539-1555), Spain.svg
Map of the Spanish Governorate of Terra Australis (1539-1555), the first territorial claim over the lands near the South Pole; later it was incorporated into the Governorate of Chile.

Sovereignty over regions of Antarctica is claimed by seven countries. [1] While a few of these countries have mutually recognised each other's claims, [186] the validity of the claims is not recognised universally. [1] New claims on Antarctica have been suspended since 1959, although in 2015, Norway formally defined Queen Maud Land as including the unclaimed area between it and the South Pole. [187]

The Argentine, British, and Chilean claims overlap and have caused friction. In 2012, after the British Foreign & Commonwealth Office designated a previously unnamed area Queen Elizabeth Land in tribute to Queen Elizabeth II's Diamond Jubilee, [188] the Argentinean government formally protested against the claim. [189] The UK passed some of the areas it claimed to Australia and New Zealand after they achieved independence. The claims by Britain, Australia, New Zealand, France, and Norway do not overlap and are recognised by each other. [186] Other member nations of the Antarctic Treaty do not recognize any claim, yet have shown some form of territorial interest in the past. [190]

DateClaimantTerritoryClaim limitsMap
1840Flag of France.svg  France Flag of the French Southern and Antarctic Lands.svg  Adélie Land 142°02′E to 136°11′E Antarctica, France territorial claim.svg
1908 Flag of the United Kingdom.svg United KingdomFlag of the British Antarctic Territory.svg  British Antarctic Territory 080°00′W to 020°00′W
  • 80°00′W to 74°00′W claimed by Chile (1940)
  • 74°00′W to 53°00′W claimed by Chile (1940) and Argentina (1943)
  • 53°00′W to 25°00′W claimed by Argentina (1943)
Antarctica, United Kingdom territorial claim.svg
1923 Flag of New Zealand.svg New Zealand Flag of the Ross Dependency (unofficial).svg Ross Dependency 160°00′E to 150°00′W Antarctica, New Zealand territorial claim.svg
1931Flag of Norway.svg  Norway Flag of Norway.svg  Peter I Island 68°50′S90°35′W / 68.833°S 90.583°W / -68.833; -90.583 (Peter I Island) Antarctica, Norway territorial claim (Peter I Island).svg
1933Flag of Australia (converted).svg  Australia Flag of Australia (converted).svg  Australian Antarctic Territory 044°38′E to 136°11′E, and 142°02′E to 160°00′E Antarctica, Australia territorial claim.svg
1939Flag of Norway.svg  Norway Flag of Norway.svg  Queen Maud Land 020°00′W to 044°38′E Antarctica, Norway territorial claim (Queen Maud Land, 2015).svg
1940Flag of Chile.svg  Chile Flag of Magallanes, Chile.svg  Chilean Antarctic Territory 090°00′W to 053°00′W
  • 80°00′W to 74°00′W claimed by the United Kingdom (1908)
  • 74°00′W to 53°00′W claimed by the United Kingdom (1908) and Argentina (1943)
Antarctica, Chile territorial claim.svg
1943Flag of Argentina.svg  Argentina Flag of Tierra del Fuego province in Argentina.svg  Argentine Antarctica 074°00′W to 025°00′W
  • 74°00′W to 53°00′W claimed by the United Kingdom (1908) and Chile (1940)
  • 53°00′W to 25°00′W claimed by the United Kingdom (1908)
Antarctica, Argentina territorial claim.svg
(Unclaimed territory) Blank flag.svg Marie Byrd Land 150°00′W to 090°00′W
(except Peter I Island)
Antarctica, unclaimed.svg

Human activity

Economic activity and tourism

The cruise ship Silver Cloud in Wilhelmina Bay Silversea Silver Cloud Wilhelmina Bay Antarctica 2 (47284124562).jpg
The cruise ship Silver Cloud in Wilhelmina Bay

Deposits of coal, hydrocarbons, iron ore, platinum, copper, chromium, nickel, gold, and other minerals have been found in Antarctica, but not in large enough quantities to extract. [193] The Protocol on Environmental Protection to the Antarctic Treaty, which came into effect in 1998 and is due to be reviewed in 2048, restricts the exploitation of Antarctic resources, including minerals. [194]

Tourists have been visiting Antarctica since 1957. [195] Tourism is subject to the provisions of the Antarctic Treaty and Environmental Protocol; [196] the self-regulatory body for the industry is the International Association of Antarctica Tour Operators. [197] Tourists arrive by small or medium ship at specific scenic locations with accessible concentrations of iconic wildlife. [195] Over 74,000 tourists visited the region during the 2019/2020 season, of which 18,500 travelled on cruise ships but did not leave them to explore on land. [198] The numbers of tourists fell rapidly after the start of the COVID-19 pandemic. Some nature conservation groups have expressed concern over the potential adverse effects caused by the influx of visitors and have called for limits on the size of visiting cruise ships and a tourism quota. [199] The primary response by Antarctic Treaty parties has been to develop guidelines that set landing limits and closed or restricted zones on the more frequently visited sites. [200]

Overland sightseeing flights operated out of Australia and New Zealand until the Mount Erebus disaster in 1979, when an Air New Zealand plane crashed into Mount Erebus, killing all of the 257 people onboard. Qantas resumed commercial overflights to Antarctica from Australia in the mid-1990s. [201]

Research

An aerial view of McMurdo Station, the largest research station in Antarctica McMurdo-Station aus der Vogelperspektive (16481391425).jpg
An aerial view of McMurdo Station, the largest research station in Antarctica

In 2017, there were more than 4,400 scientists undertaking research in Antarctica, a number that fell to just over 1,100 in the winter. [1] There are over 70 permanent and seasonal research stations on the continent; the largest, United States McMurdo Station, is capable of housing more than 1,000 people. [202] [203] The British Antarctic Survey has five major research stations on Antarctica, one of which is completely portable. The Belgian Princess Elisabeth station is one of the most modern stations and the first to be carbon-neutral. [204] Argentina, Australia, Chile, and Russia also have a large scientific presence on Antarctica. [1]

Geologists primarily study plate tectonics, meteorites, and the breakup of Gondwana. Glaciologists study the history and dynamics of floating ice, seasonal snow, glaciers, and ice sheets. Biologists, in addition to researching wildlife, are interested in how low temperatures and the presence of humans affect adaptation and survival strategies in organisms. [205] Biomedical scientists have made discoveries concerning the spreading of viruses and the body's response to extreme seasonal temperatures. [206]

An Antarctic meteorite, Allan Hills 84001 on display at the Smithsonian Museum of Natural History ALH84001 meteorite Smithsonian.jpg
An Antarctic meteorite, Allan Hills 84001 on display at the Smithsonian Museum of Natural History

The high elevation of the interior, the low temperatures, and the length of polar nights during the winter months all allow for better astronomical observations at Antarctica than anywhere else on Earth. The view of space from Earth is improved by a thinner atmosphere at higher elevations and a lack of water vapour in the atmosphere caused by freezing temperatures. [207] Astrophysicists at the Amundsen–Scott South Pole Station study cosmic microwave background radiation and neutrinos from space. [208] The largest neutrino detector in the world, the IceCube Neutrino Observatory, is at the Amundsen-Scott Station. It consists of around 5,500 digital optical modules, some of which reach a depth of 2,450 m (8,040 ft), that are held in 1 km3 (0.24 cu mi) of ice. [209]

Antarctica provides a unique environment for the study of meteorites: the dry polar desert preserves them well, and meteorites older than a million years have been found. They are relatively easy to find, as the dark stone meteorites stand out in a landscape of ice and snow, and the flow of ice accumulates them in certain areas. The Adelie Land meteorite, discovered in 1912, was the first to be found. Meteorites contain clues about the composition of the Solar System and its early development. [210] Most meteorites come from asteroids, but a few meteorites found in Antarctica came from the Moon and Mars. [211] [note 8]

Notes

  1. The word was originally pronounced with the first c silent in English, but the spelling pronunciation has become common and is often considered more correct. However, the pronunciation with a silent c, and even with the first t silent as well, is widespread and typical of many similar English words. [2] The c had ceased to be pronounced in Medieval Latin and was dropped from the spelling in Old French, but it was added back for etymological reasons in English in the 17th century and thereafter began to be pronounced, but (as with other spelling pronunciations) at first only by less educated people. [3] For those who pronounce the first t, there is also variation between the pronunciations Ant-ar(c)tica and An-tar(c)tica.
  2. Before the Southern Ocean was recognised as a separate ocean, it was considered to be surrounded by the southern Pacific, Atlantic, and Indian Oceans. [12]
  3. Geographical features, such as ice caps, are shown as they are today for identification purposes, not as how they appeared at these times.
  4. The feature discovered by the Russians was the Fimbul ice shelf.
  5. Ross passed through what is now known as the Ross Sea and discovered Ross Island (both of which were named after him) in 1841. He sailed along a huge wall of ice that was later named the Ross Ice Shelf. [157] Mount Erebus and Mount Terror are named after two ships from his expedition: HMS Erebus and Terror. [158]
  6. The women were Pam Young, Jean Pearson, Lois Jones, Eileen McSaveney, Kay Lindsay and Terry Tickhill. [168]
  7. The first settlements included Grytviken, Leith Harbour, King Edward Point, Stromness, Husvik, Prince Olav Harbour, Ocean Harbour and Godthul. Managers and other senior officers of the whaling stations often lived together with their families. Among them was the founder of Grytviken, Captain Carl Anton Larsen, a prominent Norwegian whaler and explorer who, along with his family, adopted British citizenship in 1910. [171]
  8. Antarctician meteorites, particularly ALH84001 discovered by ANSMET, were at the centre of the controversy about possible evidence of life on Mars. Because meteorites in space absorb and record cosmic radiation, the time elapsed since the meteorite hit the Earth can be calculated. [212]

Related Research Articles

<span class="mw-page-title-main">Antarctic Circumpolar Current</span> Ocean current that flows clockwise from west to east around Antarctica

The Antarctic Circumpolar Current (ACC) is an ocean current that flows clockwise from west to east around Antarctica. An alternative name for the ACC is the West Wind Drift. The ACC is the dominant circulation feature of the Southern Ocean and has a mean transport estimated at 100–150 Sverdrups, or possibly even higher, making it the largest ocean current. The current is circumpolar due to the lack of any landmass connecting with Antarctica and this keeps warm ocean waters away from Antarctica, enabling that continent to maintain its huge ice sheet.

<span class="mw-page-title-main">Antarctic</span> Polar region around Earths South Pole

The Antarctic is a polar region around Earth's South Pole, opposite the Arctic region around the North Pole. The Antarctic comprises the continent of Antarctica, the Kerguelen Plateau and other island territories located on the Antarctic Plate or south of the Antarctic Convergence. The Antarctic region includes the ice shelves, waters, and all the island territories in the Southern Ocean situated south of the Antarctic Convergence, a zone approximately 32 to 48 km wide varying in latitude seasonally. The region covers some 20 percent of the Southern Hemisphere, of which 5.5 percent is the surface area of the Antarctica continent itself. All of the land and ice shelves south of 60°S latitude are administered under the Antarctic Treaty System. Biogeographically, the Antarctic realm is one of eight biogeographic realms of Earth's land surface.

<span class="mw-page-title-main">Eocene</span> Second epoch of the Paleogene Period

The Eocene Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name Eocene comes from the Ancient Greek ἠώς and καινός and refers to the "dawn" of modern ('new') fauna that appeared during the epoch.

<span class="mw-page-title-main">Climate of Antarctica</span> Overview of the climate of Antarctica

The climate of Antarctica is the coldest on Earth. The continent is also extremely dry, averaging 166 mm (6.5 in) of precipitation per year. Snow rarely melts on most parts of the continent, and, after being compressed, becomes the glacier ice that makes up the ice sheet. Weather fronts rarely penetrate far into the continent, because of the katabatic winds. Most of Antarctica has an ice-cap climate with very cold, generally extremely dry weather.

<span class="mw-page-title-main">Vostok Station</span> Russian research station in Antarctica

Vostok Station is a Russian research station in inland Princess Elizabeth Land, Antarctica. Founded by the Soviet Union in 1957, the station lies at the southern Pole of Cold, with the lowest reliably measured natural temperature on Earth of −89.2 °C. Research includes ice core drilling and magnetometry. Vostok was named after Vostok, the lead ship of the First Russian Antarctic Expedition captained by Fabian von Bellingshausen. The Bellingshausen Station was named after this captain.

<span class="mw-page-title-main">West Antarctic Ice Sheet</span> Segment of the continental ice sheet that covers West (or Lesser) Antarctica

The Western Antarctic Ice Sheet (WAIS) is the segment of the continental ice sheet that covers West Antarctica, the portion of Antarctica on the side of the Transantarctic Mountains that lies in the Western Hemisphere. The WAIS is classified as a marine-based ice sheet, meaning that its bed lies well below sea level and its edges flow into floating ice shelves. The WAIS is bounded by the Ross Ice Shelf, the Ronne Ice Shelf, and outlet glaciers that drain into the Amundsen Sea.

<span class="mw-page-title-main">Marie Byrd Land</span> Unclaimed West Antarctic region

Marie Byrd Land (MBL) is an unclaimed region of Antarctica. With an area of 1,610,000 km2 (620,000 sq mi), it is the largest unclaimed territory on Earth. It was named after the wife of American naval officer Richard E. Byrd, who explored the region in the early 20th century.

<span class="mw-page-title-main">Antarctic ice sheet</span> Earths southern polar ice cap

The Antarctic ice sheet is one of the two polar ice caps of Earth. It covers about 98% of the Antarctic continent and is the largest single mass of ice on Earth, with an average thickness of over 2 kilometers. It covers an area of almost 14 million square kilometres and contains 26.5 million cubic kilometres of ice. A cubic kilometer of ice weighs approximately 0.92 metric gigatonnes, meaning that the ice sheet weighs about 24,380,000 gigatonnes. It holds approximately 61% of all fresh water on Earth, equivalent to about 58 meters of sea level rise if all the ice were above sea level. In East Antarctica, the ice sheet rests on a major land mass, while in West Antarctica the bed can extend to more than 2,500 m below sea level.

This is a list of extreme points in Antarctica.

<span class="mw-page-title-main">Polar vortex</span> Persistent cold-core low-pressure area that circles one of the poles

A circumpolar vortex, or simply polar vortex, is a large region of cold, rotating air that encircles both of Earth's polar regions. Polar vortices also exist on other rotating, low-obliquity planetary bodies. The term polar vortex can be used to describe two distinct phenomena; the stratospheric polar vortex, and the tropospheric polar vortex. The stratospheric and tropospheric polar vortices both rotate in the direction of the Earth's spin, but they are distinct phenomena that have different sizes, structures, seasonal cycles, and impacts on weather.

Polar ecology is the relationship between plants and animals in a polar environment. Polar environments are in the Arctic and Antarctic regions. Arctic regions are in the Northern Hemisphere, and it contains land and the islands that surrounds it. Antarctica is in the Southern Hemisphere and it also contains the land mass, surrounding islands and the ocean. Polar regions also contain the subantarctic and subarctic zone which separate the polar regions from the temperate regions. Antarctica and the Arctic lie in the polar circles. The polar circles are imaginary lines shown on maps to be the areas that receives less sunlight due to less radiation. These areas either receive sunlight or shade 24 hours a day because of the earth's tilt. Plants and animals in the polar regions are able to withstand living in harsh weather conditions but are facing environmental threats that limit their survival.

<span class="mw-page-title-main">Nordenskjöld Coast</span> Coast in Antarctica

The Nordenskjöld Coast is located on the Antarctic Peninsula, more specifically Graham Land, which is the top region of the Peninsula. The Peninsula is a thin, long ice sheet with an Alpine-style mountain chain. The coast consists of 15m tall ice cliffs with ice shelves.

<span class="mw-page-title-main">Antarctica cooling controversy</span> Part of the public debate in the global warming controversy

The Antarctica cooling controversy was the result of an apparent contradiction in the observed cooling behavior of Antarctica between 1966 and 2000, which became part of the public debate in the global warming controversy, particularly between advocacy groups of both sides in the public arena including politicians, as well as the popular media. In his novel State of Fear, Michael Crichton asserted that the Antarctic data contradicted global warming. The few scientists who have commented on the supposed controversy state that there is no contradiction, while the author of the paper whose work inspired Crichton's remarks has said that Crichton misused his results. There is no similar controversy within the scientific community, as the small observed changes in Antarctica are consistent with the small changes predicted by climate models, and because the overall trend since comprehensive observations began is now known to be one of warming.

<span class="mw-page-title-main">East Antarctic Ice Sheet</span> Segment of the continental ice sheet that covers East Antarctica

The East Antarctic Ice Sheet (EAIS) is one of two large ice sheets in Antarctica, and the largest on the entire planet. The EAIS lies between 45° west and 168° east longitudinally.

<span class="mw-page-title-main">South Pole</span> Southernmost point on Earth

The South Pole, also known as the Geographic South Pole, Terrestrial South Pole or 90th Parallel South, is the southernmost point on Earth and lies antipodally on the opposite side of Earth from the North Pole, at a distance of 12,430 miles in all directions. It is one of the two points where Earth's axis of rotation intersects its surface.

<span class="mw-page-title-main">Polar seas</span> Collective term for the Arctic Ocean and the southern part of the Southern Ocean

Polar seas is a collective term for the Arctic Ocean and the southern part of the Southern Ocean. In the coldest years, sea ice can cover around 13 percent of the Earth's total surface at its maximum, but out of phase in the two hemispheres. The polar seas contain a huge biome with many organisms.

<span class="mw-page-title-main">Ice–albedo feedback</span>

Ice–albedo feedback is a positive feedback climate process where a change in the area of ice caps, glaciers, and sea ice alters the albedo and surface temperature of a planet. Ice is very reflective, therefore it reflects far more solar energy back to space than the other types of land area or open water. Ice–albedo feedback plays an important role in global climate change. For instance, at higher latitudes, warmer temperatures melt the ice sheets. However, if warm temperatures decrease the ice cover and the area is replaced by water or land, the albedo would decrease. This increases the amount of solar energy absorbed, leading to more warming. The change in albedo acts to reinforce the initial alteration in ice area leading to more warming. Warming tends to decrease ice cover and hence decrease the albedo, increasing the amount of solar energy absorbed and leading to more warming. In the geologically recent past, the ice–albedo positive feedback has played a major role in the advances and retreats of the Pleistocene ice sheets. Inversely, cooler temperatures increase ice, which increases albedo, leading to more cooling.

<span class="mw-page-title-main">Ice cap climate</span> Polar climate where no mean monthly temperature exceeds 0 °C (32 °F)

An ice cap climate is a polar climate where no mean monthly temperature exceeds 0 °C (32 °F). The climate covers areas in or near the high latitudes to polar regions, such as Antarctica, some of the northernmost islands of Canada and Russia. Most of Greenland is covered of Ice cap climate, only the coasts are mostly ET climate. Some regions and islands of Norway's Svalbard Archipelago that have vast deserts of snow and ice. Areas with ice cap climates are normally covered by a permanent layer of ice and have no vegetation. There is limited animal life in most ice cap climates, usually found near the oceanic margins. Although ice cap climates are inhospitable to human life, there are some small research stations scattered in Antarctica and interior Greenland.

<span class="mw-page-title-main">Antarctic sea ice</span> Sea ice of the Southern Ocean

Antarctic sea ice is the sea ice of the Southern Ocean. It extends from the far north in the winter and retreats to almost the coastline every summer, getting closer and closer to the coastline every year due to sea ice melting. Sea ice is frozen seawater that is usually less than a few meters thick. This is the opposite of ice shelves, which are formed by glaciers, they float in the sea, and are up to a kilometre thick. There are two subdivisions of sea ice: fast ice, which are attached to land; and ice floes, which are not.

<span class="mw-page-title-main">Climate change in Antarctica</span> Impacts of climate change on Antarctica

Temperature change due to climate change in Antarctica is not stable over the whole continent. West Antarctica is warming rapidly, while the inland regions are cooled by the winds in Antarctica. Water in the West Antarctic has warmed by 1 °C since year 1955. Further increase in temperature in water and on land will affect the climate, ice mass and life on the continent and have global implications. Present-day greenhouse gas concentrations are higher than ever according to ice cores from Antarctica, which indicates that warming on this continent is not part of a natural cycle and attributable to anthropogenic climate change.

References

  1. 1 2 3 4 5 6 7 8 9 10 "Antarctica". The World Factbook. Central Intelligence Agency. 3 May 2022. Archived from the original on 9 May 2022. Retrieved 9 May 2022.
  2. Antarctica Archived 8 December 2015 at the Wayback Machine . American Heritage Dictionary .
  3. Crystal 2006, p. 172
  4. 1 2 "Antarctic" . Oxford English Dictionary (3rd ed.). Oxford University Press. December 2021. Retrieved 17 January 2022. (Subscription or participating institution membership required.)
  5. Lettinck 2021, p. 158.
  6. Hyginus 1992, p. 176.
  7. Scott, Hiatt & McIlroy 2012, pp. 2–3.
  8. Cawley 2015, p. 130.
  9. McCrone & McPherson 2009, p. 75.
  10. Cameron-Ash 2018, p. 20.
  11. "Highlights from the Bartholomew Archive: The naming of Antarctica". The Bartholomew Archive. National Library of Scotland . Retrieved 23 February 2022.
  12. "How many oceans are there?". National Oceanic and Atmospheric Administration. Retrieved 11 May 2022.
  13. Drewry 1983.
  14. 1 2 Trewby 2002, p. 115.
  15. Day 2019, Is all of Antarctica snow-covered?.
  16. Carroll & Lopes 2019, p. 99.
  17. Ji, Fei; Gao, Jinyao; Li, Fei; Shen, Zhongyan; Zhang, Qiao; Li, Yongdong (2017). "Variations of the effective elastic thickness over the Ross Sea and Transantarctic Mountains and implications for their structure and tectonics". Tectonophysics. 717: 127–138. Bibcode:2017Tectp.717..127J. doi:10.1016/j.tecto.2017.07.011.
  18. Fretwell, P.; et al. (28 February 2013). "Bedmap2: improved ice bed, surface and thickness datasets for Antarctica" (PDF). The Cryosphere. 7 (1): 390. Bibcode:2013TCry....7..375F. doi:10.5194/tc-7-375-2013. S2CID   13129041 . Retrieved 6 January 2014.
  19. Lucibella, Michael (21 October 2015). "The Lost Dry Valleys of the Polar Plateau". The Antarctic Sun. United States Antarctic Program . Retrieved 16 January 2022.
  20. Hallberg, Robert; Sergienko, Olga (2019). "Ice Sheet Dynamics". Geophysical Fluid Dynamics Laboratory. Retrieved 7 February 2021.
  21. Siegert & Florindo 2008, p. 532.
  22. 1 2 Quilty, Patrick G. (2007). "Origin and Evolution of the Sub-Antarctic Islands" (PDF). Papers and Proceedings of the Royal Society of Tasmania. Hobart, Tasmania: University of Tasmania. 141 (1): 35. doi:10.26749/rstpp.141.1.35. ISSN   0080-4703.
  23. Olierook, Hugo K.H.; Jourdan, Fred; Merle, Renaud E.; Timms, Nicholas E.; et al. (15 April 2016). "Bunbury Basalt: Gondwana breakup products or earliest vestiges of the Kerguelen mantle plume?". Earth and Planetary Science Letters. 440: 20–32. Bibcode:2016E&PSL.440...20O. doi: 10.1016/j.epsl.2016.02.008 . ISSN   0012-821X.
  24. Monteath 1997, p. 135.
  25. Trewby 2002, p. 75.
  26. Carroll & Lopes 2019, p. 38.
  27. Hund 2014, pp. 362–363.
  28. Browne, Malcolm W.; et al. (1995). Antarctic News Clips. National Science Foundation. p. 109. Retrieved 2 February 2021.
  29. Trewby 2002, p. 92.
  30. Klages, Johann P.; et al. (April 2020). "Temperate rainforests near the South Pole during peak Cretaceous warmth". Nature. 580 (7801): 81–86. Bibcode:2020Natur.580...81K. doi:10.1038/s41586-020-2148-5. ISSN   1476-4687. PMID   32238944. S2CID   214736648.
  31. Cantrill & Poole 2012, p. 31.
  32. Rolland, Yann; et al. (15 January 2019). "Late Paleozoic Ice Age glaciers shaped East Antarctica landscape". Earth and Planetary Science Letters. Elsevier. 506: 125–126. Bibcode:2019E&PSL.506..123R. doi:10.1016/j.epsl.2018.10.044. S2CID   134360219.
  33. 1 2 Cantrill & Poole 2012, pp. 57–104, "Collapsing ice sheets and evolving polar forests of the middle to late Paleozoic". doi:10.1017/cbo9781139024990.003
  34. Vega, Greta; Ángel Olalla-Tárraga, Miguel (2020). "Past changes on fauna and flora distribution". In Oliva, Marc; Ruiz Fernandez, Jesus (eds.). Past Antarctica : paleoclimatology and climate change. London. p. 170. ISBN   978-0-12-817925-3.
  35. 1 2 Collinson, James; William R., Hammer (2007). "Migration of Triassic tetrapods to Antarctica". United States Geological Survey . Retrieved 13 February 2022.
  36. Cantrill & Poole 2012, pp. 105–160, "Icehouse to hothouse: floral turnover, the Permian–Triassic crisis and Triassic vegetation". doi:10.1017/cbo9781139024990.004
  37. Jasinoski 2013, p. 139.
  38. Birkenmajer, Krzysztof (1994). "Evolution of the Pacific margin of the northern Antarctic Peninsula: An overview". International Journal of Earth Sciences. 83 (2): 309–321. Bibcode:1994GeoRu..83..309B. doi:10.1007/BF00210547. S2CID   129700054.
  39. Cantrill & Poole 2012, pp. 9, 35, 56, 71, 185, 314.
  40. Crame, James Alistair (1989). "Origins and Evolution of the Antarctic Biota". Special Publications. Geological Society of London. 47: 90. doi:10.1144/GSL.SP.1989.047.01.01. S2CID   131433262.
  41. Riffenburgh 2007, p. 413.
  42. Smith, Nathan D.; Pol, Diego (2007). "Anatomy of a basal sauropodomorph dinosaur from the Early Jurassic Hanson Formation of Antarctica" (PDF). Acta Palaeontologica Polonica. 52 (4): 657–674.
  43. Coria, R. A.; Moly, J. J.; Reguero, M.; Santillana, S.; Marenssi, S. (2013). "A new ornithopod (Dinosauria; Ornithischia) from Antarctica". Cretaceous Research. 41: 186–193. doi:10.1016/j.cretres.2012.12.004.
  44. Rozadilla, Sebastián; Agnolin, Federico L.; Novas, Novas; Rolando, Alexis M. Aranciaga; et al. (2016). "A new ornithopod (Dinosauria, Ornithischia) from the Upper Cretaceous of Antarctica and its palaeobiogeographical implications". Cretaceous Research. 57: 311–324. doi:10.1016/j.cretres.2015.09.009.
  45. Ely, Ricardo C.; Case, Judd A. (April 2019). "Phylogeny of A New Gigantic Paravian (Theropoda; Coelurosauria; Maniraptora) From The Upper Cretaceous Of James Ross Island, Antarctica". Cretaceous Research. 101: 1–16. doi:10.1016/j.cretres.2019.04.003. S2CID   146325060.
  46. Leslie, Mitch (December 2007). "The Strange Lives of Polar Dinosaurs". Smithsonian Magazine. Archived from the original on 30 January 2008. Retrieved 24 January 2008.
  47. Gaina, Carmen; Müller, R. Dietmar; Brown, Belinda; Ishihara, Takemi; Ivanov, Sergey (July 2007). "Breakup and early seafloor spreading between India and Antarctica". Geophysical Journal International. 170 (1): 151–169. Bibcode:2007GeoJI.170..151G. doi: 10.1111/j.1365-246X.2007.03450.x .
  48. Defler 2019 , pp. 185–198
  49. Gelfo, Javier N.; Goin, Francisco J.; Bauzá, Nicolás; Reguero, Marcelo (30 September 2019). "The fossil record of Antarctic land mammals: Commented review and hypotheses for future research". Advances in Polar Science: 274–292. doi:10.13679/j.advps.2019.0021. Archived from the original on 6 January 2022. Retrieved 15 January 2022.
  50. Eldridge, Mark D B; Beck, Robin M D; Croft, Darin A; Travouillon, Kenny J; Fox, Barry J (23 May 2019). "An emerging consensus in the evolution, phylogeny, and systematics of marsupials and their fossil relatives (Metatheria)". Journal of Mammalogy. 100 (3): 802–837. doi:10.1093/jmammal/gyz018. ISSN   0022-2372.
  51. Ball, Philip; Eagles, Graeme; Ebinger, Cynthia; McClay, Ken; Totterdell, Jennifer (2013). "The spatial and temporal evolution of strain during the separation of Australia and Antarctica". Geochemistry, Geophysics, Geosystems. 14 (8): 2771–2799. Bibcode:2013GGG....14.2771B. doi:10.1002/ggge.20160. ISSN   1525-2027. S2CID   11271131.
  52. England, Matthew H.; Hutchinson, David K.; Santoso, Agus; Sijp, Willem P. (1 August 2017). "Ice–Atmosphere Feedbacks Dominate the Response of the Climate System to Drake Passage Closure". Journal of Climate . American Meteorological Society. 30 (15): 5775. Bibcode:2017JCli...30.5775E. doi:10.1175/JCLI-D-15-0554.1. JSTOR   26388506. S2CID   133542067 . Retrieved 30 January 2022.
  53. DeConto, Robert M.; Pollard, David (16 January 2003). "Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2" (PDF). Nature. 421 (6920): 245–9. Bibcode:2003Natur.421..245D. doi:10.1038/nature01290. PMID   12529638. S2CID   4326971.
  54. Trewby 2002, p. 102.
  55. Trewby 2002, p. 88.
  56. Poura, Amin Beiranvand; et al. (2018). "Regional geology mapping using satellite-based remote sensing approach in Northern Victoria Land, Antarctica". Polar Science . 16: 23–46. Bibcode:2018PolSc..16...23P. doi:10.1016/j.polar.2018.02.004. ISSN   1873-9652. OCLC   655039871 via ScienceDirect.
  57. Stonehouse 2002, p. 116.
  58. Feldmann, Michael O.; Woodburne, Rodney M., eds. (1988). "Geology and Paleontology of Seymour Island, Antarctic Peninsula". Geological Society of America Bulletin . Boulder, Colorado: Geological Society of America (169): 551. ISBN   9780813711690. ISSN   0016-7606.
  59. Trewby 2002, pp. 144, 197–198.
  60. Anderson 2010, p. 28.
  61. Trewby 2002, p. 71.
  62. Campbell & Claridge 1987.
  63. Paxman, Guy J. G.; et al. (27 February 2017). "Uplift and tilting of the Shackleton Range in East Antarctica driven by glacial erosion and normal faulting". Solid Earth. Journal of Geophysical Research. 122 (3): 2390–2408. Bibcode:2017JGRB..122.2390P. doi:10.1002/2016JB013841. S2CID   56243069. Archived from the original on 27 November 2020. Retrieved 4 February 2021.
  64. Salvini, Francesco; et al. (10 November 1997). "Cenozoic geodynamics of the Ross Sea region, Antarctica: Crustal extension, intraplate strike‐slip faulting, and tectonic inheritance". Journal of Geophysical Research: Solid Earth. 102 (B11): 24669–24696. Bibcode:1997JGR...10224669S. doi:10.1029/97JB01643. Archived from the original on 4 May 2021. Retrieved 4 February 2021.
  65. Trewby 2002, p. 124.
  66. Sullivan, Walter (19 December 1976). "Soviet Team Finds a 'Mountain of Iron' in Antarctica". New York Times . Retrieved 14 March 2022.
  67. Kingston, John (1991). "The Undiscovered Oil and Gas of Antarctica" (PDF). United States Geographical Survey . Santa Barbara, California: United States Department of the Interior. p. 12. Retrieved 5 March 2022.
  68. Turner, John; et al. (2009). "Record low surface air temperature at Vostok station, Antarctica". Journal of Geophysical Research: Atmospheres. 114 (D24): D24102. Bibcode:2009JGRD..11424102T. doi: 10.1029/2009JD012104 . ISSN   2156-2202.
  69. Rice, Doyle (10 December 2013). "Antarctica records unofficial coldest temperature ever". USA Today . Gannett . Retrieved 20 February 2022.
  70. "Antarctic Weather". Australian Antarctic Program . Government of Australia. 18 February 2019. Retrieved 13 January 2021.
  71. "Antarctic weather". Australian Antarctic Program. 18 February 2019. Retrieved 2 April 2022.
  72. Hui, Fengming; Ci, Tianyu; Cheng, Xiao; Scambo, Ted A.; Liu, Yan; Zhang, Yanmei; Chi, Zhaohui; Huang, Huabing; Wang, Xianwei; Wang, Fang; Zhao, Chen (2014). "Mapping blue-ice areas in Antarctica using ETM+ and MODIS data". Annals of Glaciology. 55 (66): 129–137. Bibcode:2014AnGla..55..129H. doi:10.3189/2014AoG66A069. ISSN   0260-3055. S2CID   22195720.
  73. Fountain, Andrew G.; Nylen, Thomas H.; Monaghan, Andrew; Basagic, Hassan J.; Bromwich, David (7 May 2009). "Snow in the McMurdo Dry Valleys, Antarctica". International Journal of Climatology. Royal Meteorological Society. 30 (5): 633–642. doi:10.1002/joc.1933. S2CID   13190037. Archived from the original on 7 May 2021. Retrieved 12 October 2020 via Wiley Online Library.
  74. Rohli & Vega 2018, p. 241.
  75. Stammerjohn, Sharon E.; Scambos, Ted A. (2020). "Warming reaches the South Pole". Nature Climate Change . 10 (8): 710–711. Bibcode:2020NatCC..10..710S. doi:10.1038/s41558-020-0827-8. ISSN   1758-6798. S2CID   220260051.
  76. Clem, Kyle R.; Fogt, Ryan L.; Turner, John; Lintner, Benjamin R.; Marshall, Gareth J.; Miller, James R.; Renwick, James A. (2020). "Record warming at the South Pole during the past three decades". Nature Climate Change. 10 (8): 762–770. Bibcode:2020NatCC..10..762C. doi:10.1038/s41558-020-0815-z. ISSN   1758-6798. S2CID   220261150.
  77. "Antarctica logs highest temperature on record of 18.3C". BBC News . 7 February 2020. Retrieved 20 February 2022.
  78. Gillett, N. P.; Stone, D.I.A.; Stott, P.A.; Nozawa, T.; Karpechko, A.Y.; Hegerl, G.C.; Wehner, M.F.; Jones, P.D. (2008). "Attribution of polar warming to human influence". Nature Geoscience . 1 (11): 750. Bibcode:2008NatGe...1..750G. doi:10.1038/ngeo338. S2CID   129243936.
  79. Steig, E.J.; et al. (2013). "Recent climate and ice-sheet changes in West Antarctica compared with the past 2,000 years". Nature Geoscience. 6 (5): 372–375. Bibcode:2013NatGe...6..372S. doi:10.1038/ngeo1778. hdl: 2060/20150001452 . S2CID   49324916.
  80. Meredith, M.; et al. (2019). "Chapter 3: Polar Regions" (PDF). IPCC Special Report on the Ocean and Cryosphere in a Changing Climate. p. 212.
  81. Thomas 2007, p. 24.
  82. Thomas 2007, p. 26.
  83. Vaughan, D. G.; Comiso, J. C.; Allison, I.; Carrasco, J.; et al. (2013). "Chapter 4: Observations: Cryosphere" (PDF). Intergovernmental Panel on Climate Change Fifth Assessment Report; Working Group 1. p. 330.
  84. Scott, Michon (28 April 2020). "Understanding climate: Antarctic sea ice extent". NOAA Climate.gov. Retrieved 1 February 2021.
  85. Meredith, M.; Sommerkorn, M.; Cassotta, S.; Derksen, C.; et al. (2019). "Chapter 3: Polar Regions" (PDF). IPCC Special Report on the Ocean and Cryosphere in a Changing Climate. p. 214.
  86. Rignot, E.; Casassa, G.; Gogineni, P.; Krabill, W.; Rivera, A.; Thomas, R. (2004). "Accelerated ice discharge from the Antarctic Peninsula following the collapse of Larsen B ice shelf" (PDF). Geophysical Research Letters . 31 (18): L18401. Bibcode:2004GeoRL..3118401R. doi:10.1029/2004GL020697. S2CID   12081378. Archived from the original (PDF) on 23 November 2011. Retrieved 22 October 2011.
  87. Oppenheimer, M.; et al. (2019). "Chapter 4: Sea Level Rise and Implications for Low Lying Islands, Coasts and Communities" (PDF). IPCC Special Report on the Ocean and Cryosphere in a Changing Climate. Intergovernmental Panel on Climate Change. pp. 346–347.
  88. Jones, Nicola (19 March 2002). "Giant Antarctic ice sheet breaks off". New Scientist . Retrieved 20 February 2022.
  89. "Huge Antarctic ice chunk collapses". CNN. Associated Press. 25 March 2008. Archived from the original on 29 March 2008. Retrieved 25 March 2008.
  90. Walton, Marsha (25 March 2008). "Massive ice shelf on verge of breakup". CNN. Archived from the original on 29 March 2008. Retrieved 26 March 2008.
  91. "Ice bridge ruptures in Antarctic". BBC News. 5 April 2009. Archived from the original on 6 April 2009. Retrieved 5 April 2009.
  92. Larter, Robert D. (28 February 2022). "Basal Melting, Roughness and Structural Integrity of Ice Shelves". Geophysical Research Letters. 49 (4). Bibcode:2022GeoRL..4997421L. doi:10.1029/2021GL097421. ISSN   0094-8276. S2CID   247660520.
  93. Slater, Thomas; Hogg, Anna E.; Mottram, Ruth (October 2020). "Ice-sheet losses track high-end sea-level rise projections". Nature Climate Change. 10 (10): 879–881. Bibcode:2020NatCC..10..879S. doi:10.1038/s41558-020-0893-y. ISSN   1758-6798. S2CID   221381924.
  94. Riffenburgh 2007, p. 128.
  95. 1 2 3 4 Rignot, Eric; Mouginot, Jérémie; Scheuchl, Bernd; van den Broeke, Michiel; van Wessem, Melchior J.; Morlighem, Mathieu (2019). "Four decades of Antarctic Ice Sheet mass balance from 1979–2017". Proceedings of the National Academy of Sciences. 116 (4): 1095–1103. Bibcode:2019PNAS..116.1095R. doi: 10.1073/pnas.1812883116 . ISSN   0027-8424. PMC   6347714 . PMID   30642972.
  96. 1 2 Bell, Robin E.; Seroussi, Helene (20 March 2020). "History, mass loss, structure, and dynamic behavior of the Antarctic Ice Sheet". Science. 367 (6484): 1321–1325. Bibcode:2020Sci...367.1321B. doi:10.1126/science.aaz5489. ISSN   0036-8075. PMID   32193319. S2CID   213191762.
  97. Shepherd, Andrew; Ivins, Erik; et al. (IMBIE team) (13 June 2018). "Mass balance of the Antarctic Ice Sheet from 1992 to 2017" (PDF). Nature . 558 (7709): 219–222. Bibcode:2018Natur.558..219I. doi:10.1038/s41586-018-0179-y. hdl:2268/225208. PMID   29899482. S2CID   49188002. Archived from the original (PDF) on 27 January 2019. Retrieved 27 January 2019.
  98. Fox-Kemper, Baylor; Hewitt, Helene T.; Xiao, Cunde; et al. (2021). "Chapter 9: Ocean, Cryosphere, and Sea Level Change" (PDF). Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate. Cambridge University Press. Section 9.4.2.1.
  99. Martin‐Español, Alba; Bamber, Jonathan L.; Zammit‐Mangion, Andrew (2017). "Constraining the mass balance of East Antarctica". Geophysical Research Letters. 44 (9): 4168–4175. Bibcode:2017GeoRL..44.4168M. doi:10.1002/2017GL072937. ISSN   1944-8007. S2CID   55221083. Archived from the original on 11 November 2020. Retrieved 3 February 2021.
  100. Pattyn, Frank; Morlighem, Mathieu (20 March 2020). "The uncertain future of the Antarctic Ice Sheet". Science. 367 (6484): 1331–1335. Bibcode:2020Sci...367.1331P. doi:10.1126/science.aaz5487. ISSN   0036-8075. PMID   32193321. S2CID   213191697.
  101. Fox-Kemper, Baylor; Hewitt, Helene T.; Xiao, Cunde; Aðalgeirsdóttir, Guðfinna; et al. (2021). "Chapter 9: Ocean, cryosphere, and sea level change" (PDF). Climate Change 2021: The Physical Science Basis. Section 9.4.2.6.
  102. Douglass, Anne R.; Newman, Paul A.; Solomon, Susan (1 July 2014). "The Antarctic ozone hole: An update". Physics Today . American Institute of Physics. 67 (7): 42–48. Bibcode:2014PhT....67g..42D. doi:10.1063/PT.3.2449. hdl:1721.1/99159 via MIT Open Access Articles.
  103. 1 2 Schiermeier, Quirin (12 August 2009). "Atmospheric science: Fixing the sky". Nature. 460 (7257): 792–795. doi: 10.1038/460792a . PMID   19675624.
  104. Bates, Sofie (30 October 2020). "Large, Deep Antarctic Ozone Hole Persisting into November". NASA . Retrieved 6 February 2021.
  105. "Record-breaking 2020 ozone hole closes". World Meteorological Organization . 6 January 2021. Retrieved 6 February 2021.
  106. "The Ozone Hole". British Antarctic Survey. 1 April 2017. Archived from the original on 4 March 2022. Retrieved 7 May 2022.
  107. "Q10: Why has an "ozone hole" appeared over Antarctica when ozone-depleting substances are present throughout the stratosphere?" (PDF). 20 Questions: 2010 Update. NOAA. 2010. Retrieved 2 April 2022.
  108. "World Meteorological Organization Global Ozone Research and Monitoring Project—Report No. 58: Scientific Assessment of Ozone Depletion 2018" (PDF). Scientific Assessment Panel (SAP). ES.3: World Meteorological Organization . Retrieved 20 February 2022.{{cite web}}: CS1 maint: location (link)
  109. Parkinson, Claire L. (2019). "A 40-y record reveals gradual Antarctic sea ice increases followed by decreases at rates far exceeding the rates seen in the Arctic". Proceedings of the National Academy of Sciences of the United States of America . 116 (29): 14414–14423. Bibcode:2019PNAS..11614414P. doi: 10.1073/pnas.1906556116 . PMC   6642375 . PMID   31262810.
  110. Chung, Eui-Seok; Kim, Seong-Joong; Timmermann, Axel; Ha, Kyung-Ja; et al. (2022). "Antarctic sea-ice expansion and Southern Ocean cooling linked to tropical variability". Nature Climate Change. 12 (5): 461–468. Bibcode:2022NatCC..12..461C. doi:10.1038/s41558-022-01339-z. ISSN   1758-6798. S2CID   248151959.
  111. Convey, Peter; Biersma, Elisabeth; Casanova-Katny, Angelica; Maturana, Claudia S. (2020). "Refuges of Antarctic diversity". In Oliva, Marc; Ruiz Fernandez, Jesus (eds.). Past Antarctica : paleoclimatology and climate change. London. pp. 182, 187–188. ISBN   978-0-12-817925-3.
  112. "Land Animals of Antarctica". British Antarctic Survey. Natural Environment Research Council. Archived from the original on 7 October 2008. Retrieved 25 April 2017.
  113. Sandro, Luke; Constible, Juanita. "Antarctic Bestiary – Terrestrial Animals". Laboratory for Ecophysiological Cryobiology. Miami University . Retrieved 22 October 2011.
  114. Trewby 2002, p. 114.
  115. 1 2 Ancel, André; Beaulieu, Michaël; Gilbert, Caroline (2013). "The different breeding strategies of penguins: a review". Comptes rendus de l'Académie des Sciences . 336 (1): 1–12. doi:10.1016/j.crvi.2013.02.002. ISSN   0001-4036. PMID   23537764 . Retrieved 12 October 2020 via Elsevier Science Direct.
  116. Stromberg 1991 , p. 247
  117. Staniland, Iain J.; Ratcliffe, Norman; Trathan, Philip N.; Forcada, Jaume (2018). "Long term movements and activity patterns of an Antarctic marine apex predator: The leopard seal". PLOS ONE . 13 (6): e0197767. Bibcode:2018PLoSO..1397767S. doi: 10.1371/journal.pone.0197767 . PMC   5988266 . PMID   29870541.
  118. Woods, R.; Jones, H. I.; Watts, J.; Miller, G. D.; Shellam, G. R. (2009). "Diseases of Antarctic Seabirds". Health of Antarctic Wildlife: A Challenge for Science and Policy. Springer. pp. 35–55. doi:10.1007/978-3-540-93923-8_3. ISBN   978-3-540-93922-1.
  119. Kinver, Mark (15 February 2009). "Ice oceans 'are not poles apart'". BBC News. Retrieved 22 October 2011.
  120. "Plants of Antarctica". British Antarctic Survey. Natural Environment Research Council. Archived from the original on 7 June 2011. Retrieved 12 July 2011.
  121. Bridge, Paul D.; Spooner, Brian M.; Roberts, Peter J. (2008). "Non-lichenized fungi from the Antarctic region". Mycotaxon. 106: 485–490. Archived from the original on 11 August 2013. Retrieved 22 October 2011.
  122. 1 2 3 Selbmann, L; de Hoog, G S; Mazzaglia, A; Friedmann, E. I.; Onofri, S (2005). "Fungi at the edge of life: cryptoendolithic black fungi from Antarctic desert" (PDF). Studies in Mycology. 51: 1–32.
  123. de Hoog 2005, p. vii.
  124. Godinho, Valeria M. (July 2013). "Diversity and bioprospecting of fungal communities associated with endemic and cold-adapted macroalgae in Antarctica". The ISME Journal . Nature Publishing Group. 7 (7): 1434–1451. doi:10.1038/ismej.2013.77. PMC   3695302 . PMID   23702515.
  125. Rees-Owen, Rhian L.; Gill, Fiona L.; Newton, Robert J.; Ivanović, Ruza F.; Francis, Jane E.; Riding, James B.; Vane, Christopher H.; Lopes dos Santos, Raquel A. (2018). "The last forests on Antarctica: Reconstructing flora and temperature from the Neogene Sirius Group, Transantarctic Mountains". Organic Geochemistry. 118: 4–14. doi:10.1016/j.orggeochem.2018.01.001. ISSN   0146-6380. S2CID   46651929.
  126. Chwedorzewska, K.J. (2015). "Poa annua L. in the maritime Antarctic: an overview". Polar Record. 51 (6): 637–643. doi:10.1017/S0032247414000916. S2CID   84747627.
  127. "Algae". Australian Antarctic Program . Government of Australia . Retrieved 24 April 2022.
  128. Gorman, James (6 February 2013). "Bacteria Found Deep Under Antarctic Ice, Scientists Say". The New York Times . Retrieved 6 February 2013.
  129. Bulat, Sergey A. (28 January 2016). "Microbiology of the subglacial Lake Vostok: first results of borehole-frozen lake water analysis and prospects for searching for lake inhabitants". Philosophical Transactions of the Royal Society. Abstract: The Royal Society. 374 (2059). Bibcode:2016RSPTA.37440292B. doi:10.1098/rsta.2014.0292. PMID   26667905. S2CID   8399775.
  130. Raha, Bipasa (2013). "The Search for Earth-Like Habitable Planet: Antarctica Lake Vostok May be Jupiter's Europa". Science and Culture (79): 120–122. ISSN   0036-8156.
  131. Weisleitner, Klemens; et al. (10 May 2019). Pierre Amato (ed.). "Source Environments of the Microbiome in Perennially Ice-Covered Lake Untersee, Antarctica". Frontiers in Microbiology. 10: 1019. doi: 10.3389/fmicb.2019.01019 . PMC   6524460 . PMID   31134036.
  132. Hoover, Richard Brice; Pikuta, Elena V. (January 2010). "Psychrophilic and Psychrotolerant Microbial Extremophiles in Polar Environments" (PDF). National Space Science and Technology Center. Microbial Extremophiles from Lake Untersee: NASA: 25–26. Retrieved 30 January 2022.
  133. Coulter, Dana. Tony Phillips (ed.). "Extremophile Hunt Begins". Science News. NASA. Archived from the original on 23 March 2010. Retrieved 22 October 2011.
  134. 1 2 3 Wauchope, Hannah S.; Shaw, Justine D.; Terauds, Aleks (2019). "A snapshot of biodiversity protection in Antarctica". Nature Communications. 10 (1): 946. Bibcode:2019NatCo..10..946W. doi:10.1038/s41467-019-08915-6. ISSN   2041-1723. PMC   6391489 . PMID   30808907.
  135. "Toothfish fisheries". Convention for the Conservation of Antarctic Marine Living Resources . 2 July 2021. Retrieved 13 January 2021.
  136. Day 2019, The Antarctic Treaty of 1959.
  137. "The Madrid Protocol". Australian Antarctic Division. Retrieved 20 February 2022.
  138. "Protocol on Environmental Protection To The Antarctic Treaty (The Madrid Protocol)". Australian Antarctic Programme. 17 May 2019. Retrieved 8 February 2021.
  139. "Now you see it now you don't!" (PDF). ECO. Vol. 82, no. 3. November 1992. p. 5. Archived from the original (PDF) on 20 February 2022. Retrieved 20 February 2022.
  140. "Southern Ocean Whale Sanctuary". Antarctic and Southern Coalition. Archived from the original on 13 January 2022. Retrieved 13 January 2022.
  141. Coetzee, Bernard W.T.; Convey, Peter; Chown, Steven L. (2017). "Expanding the Protected Area Network in Antarctica is Urgent and Readily Achievable: Expanding Antarctica's protected areas". Conservation Letters. 10 (6): 670–680. doi:10.1111/conl.12342. S2CID   89943276.
  142. Riffenburgh 2007, p. 296.
  143. Edwards 1999, p. 250.
  144. Beaglehole 1968, p. 643.
  145. Henriques, Martha (22 October 2018). "The bones that could shape Antarctica's fate". BBC Future. Retrieved 22 July 2021.
  146. Trewby 2002, p. 39.
  147. Trewby 2002, p. 139.
  148. Tammiksaar, Erki (14 December 2013). "Punane Bellingshausen" [Red Bellingshausen]. Postimees (in Estonian).
  149. Armstrong, Terence E. (September 1971). "Bellingshausen and the discovery of Antarctica". Polar Record. 15 (99): 887–889. doi:10.1017/S0032247400062112. S2CID   129664580.
  150. Baughmann 1994 , p. 133
  151. Joyner 1992, p. 5.
  152. Trewby 2002, p. 67.
  153. Tammiksaar, E. (2016). "The Russian Antarctic Expedition under the command of Fabian Gottlieb von Bellingshausen and its reception in Russia and the world". Polar Record. 52 (5): 578–600. doi:10.1017/S0032247416000449. ISSN   0032-2474. S2CID   132425113.
  154. Cawley 2015, p. 131.
  155. Ainsworth 1847, p. 479.
  156. Hobbs, William H. (October 1932). "Wilkes Land Rediscovered". Geographical Review. 22 (4): 640. doi:10.2307/208819. JSTOR   208819 via JSTOR.
  157. Trewby 2002, p. 154.
  158. Trewby 2002, pp. 154, 185.
  159. Day 2013, p. 88.
  160. Pyne 2017 , p. 85
  161. "Tannatt William Edgeworth David". Australian Antarctic Division. Archived from the original on 29 September 2010. Retrieved 27 September 2010.
  162. Riffenburgh 2007, pp. 30–32.
  163. Trewby 2002, p. 159.
  164. Trewby 2002, p. 44.
  165. Blackadder, Jesse (December 2012). "The first woman in Antarctica". Australian Antarctic Program. Australian Antarctic Division . Retrieved 27 June 2016.
  166. Norman, F. I.; Gibson, J. A. E.; Burgess, J. S. (1998). "Klarius Mikkelsen's 1935 landing in the Vestfold Hills, East Antarctica: some fiction and some facts". Polar Record. Cambridge University Press. 34 (191): 293–304. doi:10.1017/S0032247400025985. S2CID   131433193 . Retrieved 21 February 2022.
  167. "Dates in American Naval History: October". Naval History and Heritage Command. United States Navy. Archived from the original on 26 June 2004. Retrieved 12 February 2006.
  168. 1 2 "Pamela Young". Royal Society Te Apārangi . Retrieved 21 February 2022.
  169. Ousland, Børge (13 December 2013). "Børge Ousland: How I crossed Antarctica alone". The Guardian. ISSN   0261-3077 . Retrieved 30 December 2018.
  170. "Fastest unsupported (kite assisted) journey to the South Pole taking just 34 days". Guinness World Records.
  171. 1 2 Headland 1984, p. 238.
  172. "Antarctica". Resource Library. National Geographic. 4 January 2012. Retrieved 31 August 2020.
  173. "Flock of Antarctica's Orthodox temple celebrates Holy Trinity Day". Serbian Orthodox Church. 24 May 2004. Archived from the original on 26 August 2016. Retrieved 7 February 2009.
  174. Владимир Петраков: 'Антарктика – это особая атмосфера, где живут очень интересные люди' [Vladimir Petrakov: "Antarctic is a special world, full of very interesting people"]. Pravoslavye (in Russian). 28 April 2021.
  175. Headland 1984, pp. 12, 130.
  176. Russell 1986 , p. 17
  177. "Antarctic Treaty". Scientific Committee on Antarctic Research. Archived from the original on 6 February 2006. Retrieved 9 February 2006.
  178. "Argentina in Antarctica". Antarctica Institute of Argentina. Archived from the original on 6 March 2006. Retrieved 9 February 2006.
  179. Pinochet de la Barra, Óscar (November 1944). La Antártica Chilena. Editorial Andrés Bello.
  180. Calamari, Andrea (June 2022). "El conjurado que gobernó la Antártida" (in Spanish). Jot Down.
  181. "Pedro Sancho de la Hoz" (in Spanish). Real Academia de la Historia. Retrieved 25 August 2022.
  182. "1544" (in Spanish). Biografía de Chile.
  183. Francisco Orrego Vicuña; Augusto Salinas Araya (1977). Desarrollo de la Antártica (in Spanish). Santiago de Chile: Instituto de Estudios Internacionales, Universidad de Chile; Editorial Universitaria.{{cite book}}: CS1 maint: multiple names: authors list (link)
  184. "Parties". Secretariat of the Antarctic Treaty. Archived from the original on 23 February 2022. Retrieved 2 April 2022.
  185. Yermakova, Yelena (3 July 2021). "Legitimacy of the Antarctic Treaty System: is it time for a reform?". The Polar Journal. 11 (2): 342–359. doi:10.1080/2154896X.2021.1977048. ISSN   2154-896X. S2CID   239218549.
  186. 1 2 Von Tigerstrom & Leane 2005, p. 204.
  187. Rapp, Ole Magnus (21 September 2015). "Norge utvider Dronning Maud Land helt frem til Sydpolen". Aftenposten (in Norwegian). Oslo. Retrieved 21 February 2022.
  188. "The Foreign Secretary has announced that the southern part of British Antarctic Territory has been named Queen Elizabeth Land". Foreign & Commonwealth Office. HM Government. 18 December 2012. Retrieved 22 December 2012.
  189. "Argentina angry after Antarctic territory named after Queen". BBC News. 22 December 2012. Retrieved 22 December 2012.
  190. 1 2 3 Ribadeneira, Diego (1988). "La Antartida" (PDF). AFESE (in Spanish). Archived from the original (PDF) on 7 July 2011. Retrieved 19 July 2011.
  191. Morris 1988 , p. 219
  192. 1 2 "Disputes – international". The World Factbook. Central Intelligence Agency. 2011. Archived from the original on 15 September 2020. Retrieved 22 October 2011. ... the US and Russia reserve the right to make claims ...
  193. "Natural Resources". The World Factbook . Central Intelligence Agency. Archived from the original on 3 April 2022. Retrieved 7 May 2022.
  194. Press, Tony (5 October 2016). "Antarctica: The Madrid Protocol 25 Years On". Australian Institute of International Affairs . Retrieved 19 January 2022.
  195. 1 2 Trewby 2002, pp. 187–188.
  196. "During Your Visit". International Association of Antarctica Tour Operators . Retrieved 14 February 2022.
  197. Trewby 2002, p. 107.
  198. "IAATO Antarctic visitor figures 2019–2020". Data & Statistics. International Association of Antarctica Tour Operators. July 2020. Retrieved 14 February 2022.
  199. Rowe, Mark (11 February 2006). "Tourism threatens the Antarctic". The Daily Telegraph . Archived from the original on 24 February 2008. Retrieved 5 February 2006.
  200. "Tourism and Non-Governmental Activities". Secretariat of the Antarctic Treaty. Retrieved 7 February 2022.
  201. Day 2013, pp. 507–509.
  202. Hund 2014, p. 41.
  203. Davis, Georgina (30 January 2017). "A history of McMurdo Station through its architecture". Polar Record. Cambridge University Press. 53 (2): 167–185. doi:10.1017/S0032247416000747. S2CID   132258248 via Cambridge Core.
  204. Carroll & Lopes 2019, p. 160.
  205. Stoddart, Michael (August 2010). "'Antarctic biology in the 21st century – Advances in, and beyond the international polar year 2007–2008'". Polar Science. 4 (2): 97–101. Bibcode:2010PolSc...4...97S. doi:10.1016/j.polar.2010.04.004 via Elsevier Science Direct.
  206. "Human Biology and Medicine". Australian Antarctic Programme. 16 September 2020. Retrieved 8 February 2021.
  207. Burton, Michael G. (2010). "Astronomy in Antarctica". The Astronomy & Astrophysics Review . 18 (4): 417–469. arXiv: 1007.2225 . Bibcode:2010A&ARv..18..417B. doi:10.1007/s00159-010-0032-2. ISSN   0935-4956. S2CID   16843819.
  208. "Science Goals: Celebrating a Century of Science and Exploration". National Science Foundation. 2011. Retrieved 19 January 2022.
  209. "IceCube Quick Facts". IceCube Neutrino Observatory . Retrieved 6 February 2022.
  210. "Finding Meteorite Hotspots in Antarctica". Earth Observatory. NASA. 9 March 2022. Retrieved 2 April 2022.
  211. Talbert, Tricia (14 November 2016). "Science from the Sky: NASA Renews Search for Antarctic Meteorites". NASA. Retrieved 2 April 2022.
  212. "Meteorites from Antarctica". NASA. Archived from the original on 6 March 2006. Retrieved 9 February 2006.

Bibliography

Further reading