Antarctica

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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 citiesnone
UN M49 code 010

Antarctica ( /ænˈtɑːrtɪkə/ or /ænˈtɑːrktɪkə/ ( Loudspeaker.svg listen )) [note 1] is Earth's southernmost continent. It contains the geographic South Pole and is situated in the Antarctic region of the Southern Hemisphere, almost entirely south of the Antarctic Circle, and is surrounded by the Southern Ocean. At 14,200,000 square kilometres (5,500,000 square miles), it is the fifth-largest continent and nearly twice the size of Australia. It is by far the least populated continent, with people residing at research stations; around 5,000 people in the summer and around 1,000 in the winter. The vast majority of Antarctica is covered by ice that averages 1.9 km (1.2 mi; 6,200 ft) in thickness.

Contents

Antarctica, on average, is the coldest, driest, and windiest continent, and has the highest average elevation of all the continents. [4] Most of Antarctica is a polar desert, with annual precipitation of 200 mm (8 in) along the coast and far less inland; yet 70% of world freshwater reserves are frozen there, enough to raise global sea levels by about 60 metres (200 ft) if all of it melts. The temperature in Antarctica has dropped to −89.2 °C (−128.6 °F) (or even −94.7 °C or −138.5 °F, as measured from space), [5] though the average for the third quarter (the coldest part of the year) is −63 °C (−81 °F). Organisms native to Antarctica include many types of algae, bacteria, fungi, plants, protista, and certain animals, such as mites, nematodes, penguins, seals and tardigrades. Vegetation, where it occurs, is tundra.

Antarctica was the last major region on Earth to be discovered, likely unseen until 1820 when the Russian expedition of Fabian Gottlieb von Bellingshausen and Mikhail Lazarev on Vostok and Mirny sighted the Fimbul ice shelf. The continent remained largely neglected for the rest of the 19th century because of its harsh environment, lack of easily accessible resources, and isolation. In January 1840, land at Antarctica was discovered for the first time, almost simultaneously, by the United States Exploring Expedition, under Lieutenant Charles Wilkes; and a separate French expedition under Jules Dumont d'Urville. The latter made a temporary landing. The Wilkes expedition—though it did not make a landing—remained long enough in the region to survey and map some 1,300 kilometres (800 mi) of the continent. The first confirmed landing was by a team of Norwegians in 1895.

Antarctica is governed by about thirty countries that are parties to the 1959 Antarctic Treaty System. Some other countries are parties but do not yet do substantial research there. The treaty prohibits military activities, mineral mining, nuclear explosions and nuclear waste disposal. It supports scientific research and protects the continent's ecology.

Etymology

A speculative representation of Antarctica labelled as 'Terra Australis Incognito
' on Jan Janssonius's Zeekaart van het Zuidpoolgebied
(1657), Het Scheepvaartmuseum 1657 map Polus Antarcticus.jpg
A speculative representation of Antarctica labelled as 'Terra Australis Incognito' on Jan Janssonius's Zeekaart van het Zuidpoolgebied (1657), Het Scheepvaartmuseum

'Antarctica' comes from the word Antarctic, which originates from the Middle French antartique or antarctique ('opposite to the Arctic') and the Latin antarcticus ('opposite to the north'). Antarcticus is derived from the Greek ἀντι- ('anti-') and ἀρκτικός ('of the Bear', 'northern'). [6] The Greek philosopher Aristotle wrote in Meteorology about an "Antarctic region" in c.350 BCE. [7] The Greek geographer Marinus of Tyre reportedly used the name in his world map from the 2nd century CE, now lost. [8] The Roman authors Hyginus and Apuleius (1–2 centuries CE) used for the South Pole the romanised Greek name polus antarcticus, [9] from which derived the Old French pole antartike (modern pôle antarctique) attested in 1270, and from there the Middle English pol antartik in a 1391 technical treatise by Geoffrey Chaucer, A Treatise on the Astrolabe , referring to the modern Antarctic Pole. [10]

It was common practice among early modern European geographers to refer to a speculative antipodean continent as "Terra Australis". [11] During the early 19th century the explorer Matthew Flinders popularised the transfer of the name to Australia, justifying the titling of his book A Voyage to Terra Australis (1814) by stating that there was little chance another continent would be found south of Australia. [12] 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 had to make do with clumsy phrases such as "the Antarctic Continent". They searched for a more poetic replacement, suggesting various names such as Ultima and Antipodea. [13] Antarctica was adopted in the 1890s, with the first use of the name being attributed to the Scottish cartographer John George Bartholomew. [14]

History of exploration

Belief 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 prevailed among European thought since the time of the Ancient Greeks. [15] Belief in "Terra Australis" lasted until the early nineteenth century, though the traditional conception of the continent had largely been disabused by then. [16]

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. [17] Cook came within about 120 km (75 mi) of the Antarctic coast before retreating in the face of field ice in January 1773. [18] In 1775, Cook 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". [19]

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)

The first person to sight 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 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. [20] The American sealer Nathaniel Palmer, whose sealing ship was in the region at this time, may have spotted the Antarctic Peninsular before either men. [21]

The First Russian Antarctic Expedition led by Bellingshausen and Mikhail Lazarev on the 985-ton sloop-of-war Vostok ("East") and the 530-ton support vessel Mirny ("Peaceful") reached a point within 32 km (20 mi) of Queen Maud's Land and recorded the sight of an ice shelf at 69°21′28″S2°14′50″W / 69.35778°S 2.24722°W / -69.35778; -2.24722 , [22] on 27 January 1820, [23] which became known as the Fimbul ice shelf. This 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, near Cape Charles, in West Antarctica 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. [24] [25] The first recorded and confirmed landing was at Cape Adare in 1895 by the Norwegian-Swedish whaling ship Antarctic. [26]

The oldest known human remains in Antarctica was a skull that belonged to a young woman on Yamana Beach at the South Shetland Islands, which are dated as being from 1819 to 1825, who was likely part of a sealing expedition. She was found in 1985. [27]

On 22 January 1840, two days after the discovery of the coast west of the Balleny Islands, some members of the crew of the 1837–1840 expedition of 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. [28]

Explorer James Clark 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. Mount Erebus and Mount Terror are named after two ships from his expedition: HMS Erebus and Terror. [29] Mercator Cooper landed in East Antarctica on 26 January 1853. [30]

20th century

The Nimrod Expedition of 1907-1909 (left to right): Frank Wild, Ernest Shackleton, Eric Marshall and Jameson Adams TheSouthernParty.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 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, went on to lead several expeditions until retiring in 1931. [31] In addition, Shackleton and three other members of his expedition made several firsts in December 1908 – February 1909: they were the first humans to traverse the Ross Ice Shelf, the first to traverse the Transantarctic Mountains (via the Beardmore Glacier), and the first to set foot on the South Polar Plateau. An expedition led by Norwegian polar explorer Roald Amundsen from the ship Fram became the first to reach the geographic South Pole on 14 December 1911, using a route from the Bay of Whales and up the Axel Heiberg Glacier. [32] One month later, the doomed Scott Expedition reached the pole. [33]

The American explorer Richard E. Byrd led four expeditions to Antarctica during the 1920s, 1930sand 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. [34] In 1937, Ingrid Christensen became the first woman to step onto the Antarctic mainland. [35] [36] Caroline Mikkelsen had landed on an island of Antarctica, earlier in 1935. [37]

It was not until 31 October 1956, that anyone set foot on the South Pole again; on that day a U.S. Navy group led by Rear Admiral George J. Dufek successfully landed an aircraft there. [38] The next women to step onto the South Pole were Pam Young, Jean Pearson, Lois Jones, Eileen McSaveney, Kay Lindsay and Terry Tickhill in 1969. [39]

In the southern hemisphere summer of 1996–1997 the Norwegian explorer Børge Ousland became the first person to cross Antarctica alone from coast to coast, [40] helped by a kite on parts of the journey. All attempted crossings, with no kites or resupplies, that have tried to go from the true continental edges, where the ice meets the sea, have failed due to the great distance that needs to be covered. [41] For this crossing, Ousland also holds the record for the fastest unsupported journey to the South Pole, taking just 34 days. [42]

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, Antarctica is the southernmost continent and is surrounded by the Southern Ocean; alternatively, it may be considered to be surrounded by the southern Pacific, Atlantic, and Indian Oceans, or by the southern waters of the World Ocean. There are a number of rivers and lakes in Antarctica, the longest river being the Onyx. The largest lake, Vostok, is one of the largest sub-glacial lakes in the world. Antarctica covers more than 14 million km2 (5,400,000 sq mi), [1] making it the fifth-largest continent, slightly less than 1.5 times the area of the United States. The coastline is almost 18,000 km (11,200 mi) [1] long and is mostly ice:

Coastal types around Antarctica [43] [ needs update? ]
TypePortion
Ice shelf (floating ice front)44%
Ice walls (resting on ground)38%
Ice stream/outlet glacier (ice front or ice wall)13%
Rock5%
Total100%

Antarctica is divided in two by the Transantarctic Mountains close to the neck between the Ross Sea and the Weddell Sea. The portion west of the Weddell Sea and east of the Ross Sea is called West Antarctica and the remainder East Antarctica. [44]

The vast majority of Antarctica is covered by the Antarctic ice sheet, a sheet of ice that averages 1.9 km (1.2 mi; 6,200 ft) in thickness. [45] It extends to all but a few Antarctic oases, which, with the exception of the McMurdo Dry Valleys, are located in coastal areas. [46] [47] The continent has about 90% of the world's ice. If all of this ice were melted, sea levels would rise about 58 m (190 ft). [48] In most of the interior of the continent, precipitation is very low, down to 20 mm (0.8 in) per year; in a few "blue ice" areas precipitation is lower than mass loss by sublimation, and so the local mass balance is negative. In the dry valleys, the same effect occurs over a rock base, leading to a barren and desiccated landscape. [49]

West Antarctica is covered by the West Antarctic Ice Sheet. The sheet is of recent concern because of the small possibility of its collapse. If the sheet were to break down, ocean levels would rise by several metres in a relatively short geological period of time, perhaps a matter of centuries. [50] Several Antarctic ice streams flow to one of the many Antarctic ice shelves, a process known as ice-sheet dynamics. [51]

East Antarctica lies on the Indian Ocean side of the Transantarctic Mountains and comprises Coats Land, Queen Maud Land, Enderby Land, Mac. Robertson Land, Wilkes Land, and Victoria Land. All but a small portion of this region lies within the Eastern Hemisphere. East Antarctica is largely covered by the East Antarctic Ice Sheet. [52]

Mount Erebus, an active volcano on Ross Island Mount Erebus Aerial 2.jpg
Mount Erebus, an active volcano on Ross Island

Vinson Massif, in the Ellsworth Mountains, is the highest peak in Antarctica at 4,892 m (16,050 ft). [53] There are many other mountains, on both the main continent and the surrounding islands. Mount Erebus on Ross Island is the world's southernmost active volcano. Another well-known volcano is found on Deception Island, which is famous for a giant eruption in 1970. Minor eruptions are frequent, and lava flow has been observed in recent years. Other dormant volcanoes may potentially be active. [54] In 2004, a potentially active underwater volcano was found in the Antarctic Peninsula by American and Canadian researchers. [55]

More than 70 lakes lie at the base of the continental ice sheet. Lake Vostok, discovered beneath Russia's Vostok Station in 1996, is the largest of these subglacial lakes. It was once believed that the lake had been sealed off for 500,000 to one million years, but a recent survey suggests that, every so often, there are large flows of water from one lake to another. [56]

In September 2018, researchers at the National Geospatial-Intelligence Agency released a high resolution terrain map (detail down to the size of a car, and less in some areas) of Antarctica, named the "Reference Elevation Model of Antarctica" (REMA). [57] [58]

Geologic history

Gondwana, 420 million years ago Gondwana 420 Ma.png
Gondwana, 420 million years ago

From the end of the Neoproterozoic to the Cretaceous, Antarctica was part of the supercontinent Gondwana. [59] The supercontinent gradually broke apart, and Antarctica as we know it today was formed by separating from South America (forming the Drake Passage) and Australia during the late Paleogene. [60] [ better source needed ] Antarctica was not always cold, dry, and covered in ice sheets. For a large proportion of the Phanerozoic, Antarctica experienced a tropical or temperate climate, and was covered in forests. [61]

Palaeozoic era (540–250 Ma)

During the Cambrian period, Gondwana had a mild climate. [62] West Antarctica was partially in the Northern Hemisphere, and during this period 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 this time. 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. Antarctica drifted closer to the South Pole and the climate cooled, though flora remained. [63] 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 which is 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. [64] At the end of the Permian, the eruption of the Siberian Traps led to a dry, hot climate over much of Gondwana, and the collapse of the glossopterid forest ecosystems. [64] [65] There is no evidence of any tetrapods having lived in Antarctica during the Paleozoic. [66]

Mesozoic era (250–66 Ma)

The continued warming dried out much of Gondwana. During the Triassic, Antarctica was dominated by seed ferns or pteridosperms belonging to the genus Dicroidium, which grew as trees. Other associated Triassic flora includes ginkgophytes, cycadophytes, conifers and sphenopsids. [67] Tetrapods first appeared in Antarctica during the earliest Triassic, with the earliest known fossils found in the Fremouw Formation in the Transantarctic Mountains. [66] Synapsids, known as "mammal-like reptiles", included species such as Lystrosaurus , and were common in Antarctica during the Early Triassic. [68] [69] The Antarctic Peninsula began to form during the Jurassic period (206–146 Ma). [70] Ginkgo trees, conifers, Bennettitales, horsetails, ferns and cycads were plentiful during this period. [71] In West Antarctica, coniferous forests dominated through the entire Cretaceous period (146–66 Ma), though southern beech (Nothofagus) became prominent towards the end of the Cretaceous. [72] [73] 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, [74] and Antarctopelta , Trinisaura, Morrosaurus and Imperobator from Late Cretaceous of the Antarctic Peninsula) have been described to date. [75] [76] [77] [78] It was during this era that Gondwana began to break up.

Gondwana breakup (160–23 Ma)

Africa separated from Antarctica in the Jurassic, around 160 Ma, followed by the Indian subcontinent in the early Cretaceous (about 125 Ma). During the Eocene epoch, Antarctica remained connected to South America via the Isthmus of Scotia, which connected the Antarctic Peninsula with the southern Andes, as well as to Australia. A 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. [79] [80] Marsupials are thought to have dispersed into Australia via Antarctica by the early Eocene. [81] Around 40 Ma Australia-New Guinea separated from Antarctica, so that latitudinal currents could isolate Antarctica from Australia, and the first ice began to appear. During the Eocene–Oligocene extinction event about 34 million years ago, CO2 levels were about 760 ppm, [82] and had been decreasing from earlier levels in the thousands of ppm. [83] The Drake Passage opened between Antarctica and South America anywhere from 49 to 17 Ma, resulting in the creation of the Antarctic Circumpolar Current that completely isolated the continent. [84] Models of Antarctic geography suggest that this, as well as a feedback loop caused by lowering CO2 levels, caused the creation of small yet permanent polar ice caps. [85] As CO2 levels declined further the ice began to spread rapidly, replacing the forests that until then had covered the continent. [85] Since about 15 Ma, the continent has been mostly covered with ice. [86]

Pliocene and Pleistocene

Fossil Nothofagus leaves in the Meyer Desert Formation of the Sirius Group show that intermittent warm periods allowed Nothofagus shrubs to cling to the Dominion Range as late as 3–4 Ma (mid-late Pliocene). [87] After that, the cooling of temperatures during the Pleistocene covered the whole continent in ice and destroyed all major plant life on it. [88]

A study from 2014 estimated that during the Pleistocene, the East Antarctic Ice Sheet (EAIS) thinned by at least 500 m (1,600 ft), and that thinning since the Last Glacial Maximum for the EAIS area is less than 50 m (160 ft) and probably started after about 12,000 BC. [89]

About 2,200 years ago, a volcano erupted under Antarctica's ice sheet, as detected by an airborne survey with radar images. The biggest eruption in Antarctica in the last 10,000 years, the volcanic ash was found deposited on the ice surface under the Hudson Mountains, close to Pine Island Glacier. [90]

Present-day

The geological study of Antarctica has been greatly hindered by nearly all of the continent being permanently covered with a thick layer of ice. [91] However, techniques such as remote sensing, ground-penetrating radar and satellite imagery have begun to reveal the structures beneath the ice.

Geologically, West Antarctica closely resembles the Andes mountain range of South America. [65] The Antarctic Peninsula was formed by uplift and metamorphism of sea bed sediments. [92] Due to West Antarctica being formed from several different continental plates that merged there are a number of mountain ranges in the region, with the most prominent being the Ellsworth Mountains. [91] The presence of the West Antarctic Rift System has resulted in significant volcanism along the border between West and East Antarctica, along with the creation of the Transantarctic Mountains. [91]

East Antarctica is geologically varied, dating from the Precambrian era, with some rocks formed more than 3 billion years ago. It is composed of a metamorphic and igneous platform which is the basis of the continental shield. On top of this base are coal and various modern rocks, such as sandstones, limestones and shales laid down during the Devonian and Jurassic periods to form the Transantarctic Mountains. [93] In coastal areas such as the Shackleton Range and Victoria Land some faulting has occurred. [94] [95]

Coal was first recorded near the Beardmore Glacier by Frank Wild on the Nimrod Expedition, and now low-grade coal is known across many parts of the Transantarctic Mountains. [96] The Prince Charles Mountains contain significant deposits of iron ore. Oil and natural gas fields were found in the Ross Sea in 1973. Exploitation of all mineral resources is banned until 2048 by the Protocol on Environmental Protection to the Antarctic Treaty. [97]

Climate

AntarcticaSummer.jpg
Temperate conditions near the coast in December

Antarctica is the coldest, windiest and driest of Earth's continents. [1] It was ice-free until about 34 million years ago, when it became covered with ice. [98] 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. [99] 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 metres (7 ft) above the surface as required for official air temperature records. [100] 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. [101] Signy Island recorded a temperature of 19.8 °C (67.6 °F) in January 1982, the highest temperature ever recorded in the Antarctic region (including non-continental islands). [102]

Antarctica is a frozen desert with little precipitation; the South Pole receives less than 10 mm (0.4 in) per year, on average. Sunburn is often a health issue as the snow surface reflects almost all of the ultraviolet light falling on it. Given the latitude, long periods of constant darkness or constant sunlight create climates unfamiliar to human beings in much of the rest of the world. [103]

The aurora australis, commonly known as the southern lights, is a glow observed in the night sky near the South Pole created by the plasma-full solar winds that pass by the Earth. Diamond dust, a ground-level cloud composed of tiny ice crystals, generally forms under otherwise clear or nearly clear skies, so people sometimes also refer to it as clear-sky precipitation. A sun dog, a frequent atmospheric optical phenomenon, is a bright "spot" beside the true sun. [103]

Regional climate

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. Despite the lack of precipitation over the central portion of the continent, ice there lasts for extended periods. Heavy snowfalls are common on the coastal portion of the continent, where snowfalls of up to 1.22 metres (48 in) in 48 hours have been recorded. At the continent's edge, strong katabatic winds off the polar plateau often blow at storm force. In the interior, wind speeds are typically moderate. During clear days in summer, more solar radiation reaches the surface at the South Pole than at the equator because of the 24 hours of sunlight each day at the Pole. [1]

Antarctica is colder than the Arctic for three reasons. First, much of the continent is more than 3,000 m (9,800 ft) above sea level, and temperature decreases with elevation in the troposphere. Second, the Arctic Ocean covers the north polar zone: the ocean's relative warmth is transferred through the icepack and prevents temperatures in the Arctic regions from reaching the extremes typical of the land surface of Antarctica. Third, the Earth is at aphelion in July (i.e., the Earth is farthest from the Sun in the Antarctic winter), and the Earth is at perihelion in January (i.e., the Earth is closest to the Sun in the Antarctic summer). The orbital distance contributes to a colder Antarctic winter (and a warmer Antarctic summer) but the first two effects have more impact. [104]

Climate change

AntarcticaTemps 1957-2006.jpg
Warming trend from 1957 to 2006
Scale for chart (Antarctica warming 1957-2006).svg

Some of Antarctica has been warming up; particularly strong warming has been noted on the Antarctic Peninsula. A study by Eric Steig published in 2009 noted for the first time that the continent-wide average surface temperature trend of Antarctica was slightly positive from 1957 to 2006. [105] Over the second half of the 20th century, the Antarctic Peninsula was the fastest-warming place on Earth, closely followed by West Antarctica, but these trends weakened in the early 21st-century. [106] Conversely, the South Pole in East Antarctica barely warmed last century, but temperatures rose three times the global average between 1990 and 2020. [107] In February 2020, the continent recorded its highest temperature of 18.3 °C (64.9 °F), which was a degree higher than the previous record of 17.5 °C (63.5 °F) in March 2015. [108]

There is some evidence that surface warming in Antarctica is due to human greenhouse gas emissions, [109] but this is difficult to determine due to internal variability. [110] A main component of climate variability in Antarctica is the Southern Annular Mode, which showed strengthened winds around Antarctica in 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 this mode of variability is likely the depletion of ozone above the continent. [111]

In 2002 the Antarctic Peninsula's Larsen-B ice shelf collapsed. [112] Between 28 February and 8 March 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, [113] [114] prior to its collapse on 5 April 2009. [115] [116]

Ice loss and global sea level

An animation of Antarctic ice flow
AA bedrock bedmap2.4960.tif
The bedrock topography of the continent

Being at the South Pole, Antarctica receives relatively little solar radiation except during the southern summer, so it is a very cold continent where water is mostly in the form of ice. Precipitation is low (most of Antarctica is a desert) and almost always in the form of snow, which accumulates and forms the giant ice sheets which cover the continent. [117] Parts of this ice sheet form moving glaciers known as ice streams, which flow towards the edges of the continent. [118] Next to the continental shore are many ice shelves, which are floating extensions of outflowing glaciers from the continental ice mass. [119]

Sea ice and ice shelves

Sea ice extent expands annually in the Antarctic winter, but most of it melts in the summer. [120] This ice is formed from and floats in ocean water, and thus does not contribute to a rise in sea level. [121] The extent of sea ice around Antarctica, in terms of square kilometres of coverage, has seen no significant trend in the satellite era (1978–2018), with initial growth being reversed in the last years of the record. A possible explanation for the difference between the Antarctic and the Arctic, which has seen rapid sea ice loss, is that thermohaline circulation transports warmed water to deeper layers in the ocean. The amount of variation it has experienced in its thickness is unclear, with satellite techniques just emerging as of 2019. [122]

Melting of floating ice shelves (ice that originated on the land) does not in itself contribute much to sea-level rise, since the ice displaces only its own mass of water. However, ice sheets work as a stabilizer of the land ice, and are vulnerable to warming water. Recent decades have witnessed several dramatic collapses of large ice shelves around the coast of Antarctica, especially along the Antarctic Peninsula. [123] This 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. [124]

Ice sheet loss and sea level rise

Ice mass loss since 2002, as measured by NASA's GRACE and GRACE Follow-On satellite projects, averaged 152 billion metric tons per year. 20201210 Antarctica ice mass variation - NASA GRACE-en.svg
Ice mass loss since 2002, as measured by NASA's GRACE and GRACE Follow-On satellite projects, averaged 152 billion metric tons per year.

The Antarctic ice sheet is losing mass as ice flows faster into the ocean than before. This effect is partially offset by additional snow falling back onto the continent. [126] A 2018 systematic review study estimated that ice loss across the entire continent was 43 gigatonnes per year on average during the period from 1992 to 2002 but accelerated to an average of 220 gigatonnes per year during the five years from 2012 to 2017. [127] The total contribution to sea level rise has been estimated as 8 mm to 14 mm of sea level rise. [126] [128]

On the continent itself, the large volume of ice stores around 70% of the world's fresh water. [129] East Antarctica is a cold region with a ground base above sea level and occupies most of the continent. This area is dominated by small accumulations of snowfall which becomes ice and thus eventually seaward glacial flows. Estimates of the mass balance of the East Antarctic Ice Sheet as a whole range from slightly positive to slightly negative. [128] [130] Increased ice outflow has been observed in some regions. [128]

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 significantly faster and irreversibly. That is, even when temperatures come down again, the ice will not immediately regrow. [131] [132]

Ozone depletion

Image of the largest Antarctic ozone hole ever recorded due to CFCs accumulation (September 2006) NASA and NOAA Announce Ozone Hole is a Double Record Breaker.png
Image of the largest Antarctic ozone hole ever recorded due to CFCs accumulation (September 2006)

There is a large area of low ozone concentration or "ozone hole" over Antarctica. Such ozone depletion, reoccurring every spring since the 1970s, was detected by scientists in 1985. [134] This hole covers almost the whole continent and was at its largest in September 2006; [133] the longest-lasting event occurred in 2020. [135] The ozone hole is caused by emissions of CFCs (chlorofluorocarbons) into the atmosphere, which decompose the ozone into other gases. [136] In 2019, the ozone hole was at its smallest in the previous thirty years, due to the warmer polar stratosphere weakening the polar vortex. This reduced the formation of the 'polar stratospheric clouds' that enable the chemistry that leads to rapid ozone loss. [137]

Ozone depletion may have a dominant role in governing climatic change in Antarctica (and a wider area of the Southern Hemisphere). [134] Ozone absorbs large amounts of ultraviolet radiation in the stratosphere. Ozone depletion over Antarctica can cause a cooling of around 6 °C in the local stratosphere. This cooling has the effect of intensifying the westerly winds which flow around the continent (the polar vortex) and thus prevents outflow of the cold air near the South Pole. As a result, the continental mass of the East Antarctic ice sheet is held at lower temperatures, and the peripheral areas of Antarctica, especially the Antarctic Peninsula, are subject to higher temperatures, which promote accelerated melting. [134] Models suggest that ozone depletion and the enhanced polar vortex effect also account for the period, lasting from when observation started in the early 1970s till 2014, of increasing sea ice levels offshore of the continent. [138] [139] Since 2014, Antarctic sea ice levels have decreased rapidly. [139]

Biodiversity

The terrestrial and native year-round species appear to be the descendants of ancestors who lived in geothermally warmed environments during the last ice age, when these areas were the only places on the continent not covered by ice. [140]

Animals

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

Invertebrate life of Antarctica includes microscopic mites like Alaskozetes antarcticus , lice, nematodes, tardigrades, rotifers, krill and springtails. The flightless midge Belgica antarctica , up to 6 mm (14 in) in size, is the largest purely terrestrial animal in Antarctica. [141] Other members of Chironomidae, such as Parochlus steinenii , also inhabit the continent. [142] Antarctic krill, which congregate in large schools, is the keystone species of the ecosystem of the Southern Ocean, and is an important food organism for whales, seals, leopard seals, fur seals, squid, icefish, penguins, albatrosses and many other birds. [143]

Few terrestrial vertebrates live in Antarctica, and those that do are limited to the sub-Antarctic islands. [144] Some species of marine animals exist and rely, directly or indirectly, on the phytoplankton. Antarctic sea life includes penguins, blue whales, orcas, colossal squids and fur seals. 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. [145] The snow petrel is one of only three birds that breed exclusively in Antarctica. [146] The Antarctic fur seal was very heavily hunted in the 18th and 19th centuries for its pelt by sealers from the United States and the United Kingdom. [147] [148] The Weddell seal, a "true seal", is named after Sir James Weddell, commander of British sealing expeditions in the Weddell Sea. [149] Leopard seals are apex predators in the Antarctic ecosystem, and migrate across the Southern Ocean in search of food. [150]

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. More surprising are small forms of life such as sea cucumbers and free-swimming snails found in both polar oceans. Various factors may aid in their distribution—fairly uniform temperatures of the deep ocean at the poles and the equator which differ by no more than 5 °C, and the major current systems or marine conveyor belt which transport eggs and larval stages. [151]

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 from Antarctica, of which about 750 are non-lichen-forming and 400 are lichen-forming. [152] [153] Some of these species colonize structural cavities within porous rocks as a result of evolution under extreme conditions, and have significantly contributed to shaping the impressive rock formations of the McMurdo Dry Valleys and surrounding mountain ridges. The apparently simple morphology, scarcely differentiated structures, metabolic systems and enzymes still active at very low temperatures, and reduced life cycles shown by such fungi make them particularly suited to harsh environments such as the McMurdo Dry Valleys. In particular, their thick-walled and strongly melanised cells make them resistant to UV light. Those features can also be observed in algae and cyanobacteria, suggesting that these are adaptations to the conditions prevailing in Antarctica. This has led to speculation that, if life ever occurred on Mars, it might have looked similar to Antarctic fungi such as Cryomyces antarcticus , and Cryomyces minteri . [154] [155] Some of these fungi are also apparently endemic to Antarctica. Endemic Antarctic fungi also include certain dung-inhabiting species, which live in the dung of birds, and which have had to evolve in response to the double challenge of extreme cold while growing on dung, and the need to survive passage through the gut of warm-blooded animals. [156] [157]

Plants

About 300 million years ago Permian forests started to cover the continent, and tundra vegetation survived as late as 15 million years ago, [158] but the climate of present-day Antarctica does not allow extensive vegetation to form. A combination of freezing temperatures, poor soil quality, lack of moisture, and lack of sunlight inhibit plant growth. As a result, the diversity of plant life is very low and limited in distribution. The flora of the continent largely consists of bryophytes. There are about 100 species of mosses and 25 species of liverworts, but only 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). [159] Growth is restricted to a few weeks in the summer. [152] [160]

Other organisms

Seven hundred species of algae exist, most of which are phytoplankton. Multicoloured snow algae and diatoms are especially abundant in the coastal regions during the summer. [160] Bacteria have been found living in the cold and dark as deep as 800 m (0.50 mi; 2,600 ft) under the ice. [161] There is some evidence, in the form of ice cores drilled to about 400 m (1,300 ft) above the water line, that Lake Vostok's waters may contain microbial life. The frozen surface of the lake shares similarities with Jupiter's moon Europa. If life is discovered in Lake Vostok, it would strengthen the argument for the possibility of life on Europa. [162] [163] In 2008, a NASA team embarked on a mission to Lake Untersee, searching for extremophiles in its highly alkaline waters.[ needs update ] If found, highly resilient creatures could further bolster the argument for extraterrestrial life in extremely cold, methane-rich environments. [164]

Conservation

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 Protocol on Environmental Protection to the Antarctic Treaty (also known as the Environmental Protocol or Madrid Protocol) came into force in 1998, and is the main instrument concerned with conservation and management of biodiversity in Antarctica. The Antarctic Treaty Consultative Meeting is advised on environmental and conservation issues in Antarctica by the Committee for Environmental Protection. A major concern within this committee is the risk to Antarctica from unintentional introduction of non-native species from outside the region. [165]

The passing of the Antarctic Conservation Act (1978) in the U.S. brought several restrictions to U.S. activity on Antarctica. The introduction of alien plants or animals can bring a criminal penalty, as can the extraction of any indigenous species. The overfishing of krill, which 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 (CCAMLR), a treaty that came into force in 1980, requires that regulations managing all Southern Ocean fisheries consider potential effects on the entire Antarctic ecosystem. [1] Despite these regulations, unregulated, unreported and illegal fishing, particularly of the highly prized Patagonian toothfish (marketed as Chilean Sea Bass in the U.S.), remains a significant problem. [166]

The Southern Ocean Whale Sanctuary, established in 1994 by the International Whaling Commission and which covers 50 million square kilometers, completely surrounds the Antarctic continent. [167] All commercial whaling is banned in the zone, though Japan has continued to hunt whales in the area, ostensibly for research purposes. [167]

Population

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

Antarctica has no indigenous population. [168] Several governments maintain permanent, staffed research stations on the continent. 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, giving it a population density between 70 and 350 inhabitants per million square kilometres (180 and 900 per million square miles) at these times. Many of the stations are staffed year-round, the winter-over personnel typically arriving from their home countries for a one-year assignment. An Orthodox churchTrinity Church, opened in 2004 at the Russian Bellingshausen Station—is manned year-round by one or two priests, who are similarly rotated every year. [169] [170]

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 that 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 of Britons. The 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]

The first child born in the southern polar region was a Norwegian girl, Solveig Gunbjørg Jacobsen, born in Grytviken on 8 October 1913, and her birth was registered by the resident British Magistrate of South Georgia. She was a daughter of Fridthjof Jacobsen, the assistant manager of the whaling station, and Klara Olette Jacobsen. Fridthjof Jacobsen arrived on the island in 1904 and became the manager of Grytviken, serving from 1914 to 1921; two of his children were born on the island. [172]

Emilio Marcos Palma was the first person born south of the 60th parallel south, the first born on the Antarctic mainland, and the only living human to be the first born on any continent. [173] He was born in 1978 at Esperanza Base, on the tip of the Antarctic Peninsula; [174] [175] his parents were sent there along with seven other families by the Argentine government to determine if the continent was suitable for family life. In 1984, Juan Pablo Camacho was born at the Frei Montalva Station, becoming the first Chilean born in Antarctica. Several bases are now home to families with children attending schools at the station. [176] As of 2009, eleven children have been born in Antarctica (south of the 60th parallel south): eight at the Argentine Esperanza Base [177] and three at the Chilean Frei Montalva Station. [178]

Politics

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

Sovereignty over regions of Antarctica is claimed by seven countries. [1] While a few of these countries have mutually recognised each other's claims, [179] the validity of these 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. [180] 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. The treaty was signed by twelve countries including the Soviet Union (and later Russia), the United Kingdom, Argentina, Chile, Australia, and the United States. [181] It set aside Antarctica as a scientific preserve, and established freedom of scientific investigation and environmental protection.

Military activities

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. [182] The only documented military land manoeuvre has been the small Operation NINETY by the Argentine military in 1965. [183]

Environmental protection

In the mid-1970s, a coalition of international environmental protection organisations launched a public campaign to pressure governments to prevent any minerals development in Antarctica. [184] Greenpeace International operated its own scientific station—World Park Base—in the Ross Sea region from 1987 until 1991, [185] and conducted annual expeditions to document environmental effects of humans on Antarctica. [186]

In 1983 the Antarctic Treaty Parties began negotiations on a convention to regulate mining in Antarctica. [187] In 1988, the Convention on the Regulation of Antarctic Mineral Resources (CRAMRA) was adopted. [188] The following year, however, Australia and France announced that they would not ratify the convention, rendering it dead for all intents and purposes. They proposed instead that a comprehensive regime to protect the Antarctic environment be negotiated in its place. [189] The Protocol on Environmental Protection to the Antarctic Treaty (the "Madrid Protocol") was negotiated as other countries followed suit and on 14 January 1998 it entered into force. [189] [190] The Madrid Protocol bans all mining in Antarctica, designating the continent as a "natural reserve devoted to peace and science". [191] To protect the marine environment in Antarctica, all ships over 500 tonnes are subject to mandatory regulations under the International Code for Ships Operating in Polar Waters, adopted by the International Maritime Organization in 2017. [192] [193]

Antarctic territories

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
including overlaps:
  • 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
including overlaps:
  • 90°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
including overlaps:
  • 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) Flag of Antarctica.svg Marie Byrd Land 150°00′W to 090°00′W
(except Peter I Island)
Antarctica, unclaimed.svg

The Argentine, British and Chilean sovereignty claims overlap, and have caused friction. In 2012, the British Foreign and Commonwealth Office designated a previously unnamed area Queen Elizabeth Land in tribute to Queen Elizabeth II's Diamond Jubilee. [194] The UK ambassador to Argentina, John Freeman, was summoned to the Argentine government as a protest against the claim. [195] Argentine–UK relations had previously been damaged throughout 2012 due to disputes over the sovereignty of the nearby Falkland Islands, and the 30th anniversary of the Falklands War. [196]

The areas shown as Australia's and New Zealand's claims were British territory until they were handed over following the countries' independence. Australia currently claims the largest area. The claims of Britain, Australia, New Zealand, France and Norway are all recognised by each other. [179]

Other countries participating as members of the Antarctic Treaty have a territorial interest in Antarctica, but the provisions of the Treaty do not allow them to make their claims while it is in force. [197] [198]

Economy

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

Although coal, hydrocarbons, iron ore, platinum, copper, chromium, nickel, gold and other minerals have been found, they have not been in large enough quantities to exploit. [201] The Protocol on Environmental Protection to the Antarctic Treaty further restricts the exploitation of Antarctic resources. The agreement came into effect in 1998 and is due to be reviewed in 2048. [202] There is no current economic activity in Antarctica outside of fishing off the coast and small-scale tourism. [203]

Small-scale "expedition tourism" has existed since 1957 and is currently subject to Antarctic Treaty and Environmental Protocol provisions, but in effect self-regulated by the International Association of Antarctica Tour Operators (IAATO). Not all vessels associated with Antarctic tourism are members of IAATO, but IAATO members account for 95% of the tourist activity. Travel is largely by small or medium ship, focusing on specific scenic locations with accessible concentrations of iconic wildlife. During the early 21st century over 30,000 tourists typically visited during each Austral summer, [204] [205] [206] but Antarctic tourism experienced a severe downturn due to the COVID-19 pandemic. [203]

There has been some concern over the potential adverse environmental and ecosystem effects caused by the influx of visitors. Some environmentalists and scientists have called for stricter regulations for ships and a tourism quota. [207] The primary response by Antarctic Treaty Parties has been to develop, through their Committee for Environmental Protection and in partnership with IAATO, "site use guidelines" setting landing limits and closed or restricted zones on the more frequently visited sites. Antarctic sightseeing flights (which did not land) operated out of Australia and New Zealand until the fatal crash of Air New Zealand Flight 901 in the Mount Erebus disaster in 1979, which killed all 257 people aboard. [208] Qantas resumed commercial overflights to Antarctica from Australia in the mid-1990s. [209]

The ISO country code 3166-1 alpha-2 "AQ" is assigned to the entire continent regardless of jurisdiction. [210] Different country calling codes and currencies are used for different settlements, depending on the administrating country. [211] [ citation needed ] The Antarctican dollar, a souvenir item sold in the United States and Canada, is not legal tender. [1] [212]

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

As of 2022, 29 countries maintain 70 research stations in Antarctica, though most of these only fully operate in the summer. [213] In the summer more than 4,000 scientists operate research stations; this number decreases to just over 1,000 in the winter. [1] McMurdo Station, which is the largest research station in Antarctica, is capable of housing more than 1,000 scientists, visitors, and tourists. [214]

Researchers include biologists, geologists, oceanographers, physicists, astronomers, glaciologists, and meteorologists. Geologists tend to study plate tectonics, meteorites from outer space, and the breakup of the supercontinent Gondwana. Glaciologists in Antarctica study the history and dynamics of floating ice, seasonal snow, glaciers, and ice sheets. Biologists, in addition to examining the wildlife, are interested in how harsh temperatures and the presence of people affect adaptation and survival strategies in a wide variety of organisms. [215] Medical physicians have made discoveries concerning the spreading of viruses and the body's response to extreme seasonal temperatures. [216]

Since the 1970s an important focus of study has been the ozone layer in the atmosphere above Antarctica. In 1985, three British scientists working on data they had gathered at Halley Station on the Brunt Ice Shelf discovered the existence of a hole in this layer. It was eventually determined that the destruction of the ozone was caused by CFCs emitted by human products. [217] With the ban of CFCs in the Montreal Protocol of 1989, climate projections indicate that the ozone layer will return to 1980 levels between 2050 and 2070. [218]

In 2007, the Polar Geospatial Center (PGC) was founded. PGC uses geospatial and remote sensing technology to provide mapping services to American federally funded research teams, with the center being capable of imaging all of Antarctica at 500 mm (20 in) resolution every 45 days. [219] In 2007 the Belgian-based International Polar Foundation unveiled the Princess Elisabeth station, the world's first zero-emissions polar science station in Antarctica, to research climate change. The prefabricated station was shipped to the South Pole from Belgium by the end of 2008 to monitor the health of the polar regions. The project includes research in climatology, glaciology and microbiology. [220]

Astrophysics

A full moon allowed sufficient light for this photo at Amundsen-Scott South Pole Station. The station can be seen at far left, the power plant in the centre and the mechanic's garage in the lower right. The green light in the background is the aurora australis. Amundsen-Scott marsstation ray h edit.jpg
A full moon allowed sufficient light for this photo at Amundsen–Scott South Pole Station. The station can be seen at far left, the power plant in the centre and the mechanic's garage in the lower right. The green light in the background is the aurora australis.

Many astronomical observations are better made from the interior of Antarctica than from most surface locations because of the high elevation, which results in a thin atmosphere; low temperature, which minimises the amount of water vapour in the atmosphere; and the polar night resulting in minimal temperature change over the course of the day, thus allowing for a view of space clearer than anywhere else on Earth. [221] Astrophysicists at Amundsen–Scott South Pole Station study cosmic microwave background radiation. [222] Antarctica is home to the largest neutrino telescope in the world, the IceCube Neutrino Observatory built 2 km (1.2 mi) below Amundsen–Scott station. [223]

Meteorites from Antarctica are important for studying material formed early in the Solar System; most are thought to come from asteroids, but some may have originated on larger planets. The first meteorite was found in 1912 and named the Adelie Land meteorite. In 1969, a Japanese expedition discovered nine meteorites. Most of these meteorites have fallen onto the ice sheet in the last million years. The motion of the ice sheet tends to concentrate the meteorites at blocking locations such as mountain ranges, with wind erosion bringing them to the surface after centuries beneath accumulated snowfall. Compared with meteorites collected in more temperate regions on Earth, the Antarctic meteorites are well-preserved. [224]

This large collection of meteorites allows a better understanding of the abundance of meteorite types in the solar system and how meteorites relate to asteroids and comets. New types of meteorites and rare meteorites have been found. Among these are pieces blasted off the Moon and Mars by impacts. These specimens, particularly ALH84001 discovered by ANSMET, were at the centre of the controversy about possible evidence of microbial life on Mars. Because meteorites in space absorb and record cosmic radiation, the time elapsed since the meteorite hit the Earth can be determined from laboratory studies. The elapsed time since fall, or terrestrial residence age, of a meteorite represents more information that might be useful in environmental studies of Antarctic ice sheets. [224]

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. The pronunciation with a silent c, and even with the first t silent as well, is however 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.

Related Research Articles

Geography of Antarctica Geographic features of Antarctica

The geography of Antarctica is dominated by its south polar location and, thus, by ice. The Antarctic continent, located in the Earth's southern hemisphere, is centered asymmetrically around the South Pole and largely south of the Antarctic Circle. It is washed by the Southern Ocean or, depending on definition, the southern Pacific, Atlantic, and Indian Oceans. It has an area of more than 14 million km2.

Climate of Antarctica 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.

Ross Ice Shelf Ice shelf in Antarctica

The Ross Ice Shelf is the largest ice shelf of Antarctica. It is several hundred metres thick. The nearly vertical ice front to the open sea is more than 600 kilometres (370 mi) long, and between 15 and 50 metres high above the water surface. Ninety percent of the floating ice, however, is below the water surface.

Ice shelf Large floating platform of ice caused by glacier flowing onto ocean surface

An ice shelf is a large floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface. Ice shelves are only found in Antarctica, Greenland, Northern Canada, and the Russian Arctic. The boundary between the floating ice shelf and the anchor ice that feeds it is the grounding line. The thickness of ice shelves can range from about 100 m (330 ft) to 1,000 m (3,300 ft).

Ice sheet Large mass of glacial ice

In glaciology, an ice sheet, also known as a continental glacier, is a mass of glacial ice that covers surrounding terrain and is greater than 50,000 km2 (19,000 sq mi). The only current ice sheets are in Antarctica and Greenland; during the last glacial period at Last Glacial Maximum (LGM) the Laurentide Ice Sheet covered much of North America, the Weichselian ice sheet covered northern Europe and the Patagonian Ice Sheet covered southern South America.

Antarctic Peninsula Peninsula located in northern Antarctica

The Antarctic Peninsula, known as O'Higgins Land in Chile and Tierra de San Martin in Argentina, and originally as Graham Land in the United Kingdom and the Palmer Peninsula in the United States, is the northernmost part of the mainland Antarctica.

West Antarctic Ice Sheet 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.

Antarctic ice sheet Polar ice cap

The Antarctic ice sheet is one of the two polar ice caps of the Earth. It covers about 98% of the Antarctic continent and is the largest single mass of ice on Earth. 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 one metric gigaton, meaning that the ice sheet weighs 26,500,000 gigatons. Approximately 61 percent of all fresh water on the Earth is held in the Antarctic ice sheet, an amount equivalent to about 58 m of sea-level rise. 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.

United States Antarctic Program U.S. Government agency which maintains U.S. presence and research in Antarctica

The United States Antarctic Program is an organization of the United States government which has presence in the Antarctica continent. Founded in 1959, the USAP manages all U.S. scientific research and related logistics in Antarctica as well as aboard ships in the Southern Ocean.

This is a list of extreme points in Antarctica.

Polar vortex 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.

Pine Island Glacier Large ice stream, fastest melting glacier in Antarctica

Pine Island Glacier (PIG) is a large ice stream, and the fastest melting glacier in Antarctica, responsible for about 25% of Antarctica's ice loss. The glacier ice streams flow west-northwest along the south side of the Hudson Mountains into Pine Island Bay, Amundsen Sea, Antarctica. It was mapped by the United States Geological Survey (USGS) from surveys and United States Navy (USN) air photos, 1960–66, and named by the Advisory Committee on Antarctic Names (US-ACAN) in association with Pine Island Bay.

Nordenskjöld Coast 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.

Troll (research station) Antarctic base

Troll is a Norwegian research station located at Jutulsessen, 235 kilometres (146 mi) from the coast in the eastern part of Princess Martha Coast in Queen Maud Land, Antarctica. It is Norway's only all-year research station in Antarctica, and is supplemented by the summer-only station Tor. Troll is operated by the Norwegian Polar Institute and also features facilities for the Norwegian Meteorological Institute and the Norwegian Institute for Air Research.

Tim Naish New Zealand scientist (born 1951)

Timothy Raymond Naish is a New Zealand glaciologist and climate scientist who has been a researcher and lecturer at Victoria University of Wellington and the Director of the Antarctic Research Centre, and in 2020 became a programme leader at the Antarctic Science Platform. Naish has researched and written about the possible effect of melting ice sheets in Antarctica on global sea levels due to high CO2 emissions causing warming in the Southern Ocean. He was instrumental in establishing and leading the Antarctica Drilling Project (ANDRILL), and a Lead Author on the Intergovernmental Panel on Climate Change (IPCC) 5th Assessment Report (2014).

Antarctica cooling controversy 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 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 contradict 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.

East Antarctic Ice Sheet 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.

South Pole Southern point where the Earths axis of rotation intersects its surface

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

Polar seas 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.

Climate change in Antarctica Impacts of climate change on Antarctica

Climate change in Antarctica is resulting in rising temperatures and increasing snowmelt and ice loss. A summary study in 2018 incorporating calculations and data from many other studies estimated that total ice loss in Antarctica due to climate change was 43 gigatons per year on average during the period from 1992 to 2002 but has accelerated to an average of 220 gigatons per year during the five years from 2012 to 2017.

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Bibliography

Further reading