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An iceberg is a piece of freshwater ice more than 15 m long that has broken off a glacier or an ice shelf and is floating freely in open (salt) water. Smaller chunks of floating glacially-derived ice are called "growlers" or "bergy bits". Both are generally spawned from disintegrating icebergs. Iceberg size classes, as established by the International Ice Patrol, are summarized in Table 1. The 1912 loss of the RMS Titanic led to the formation of the International Ice Patrol in 1914. Much of an iceberg is below the surface, which led to the expression "tip of the iceberg" to illustrate a small part of a larger unseen issue. Icebergs are considered a serious maritime hazard.
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).
The Filchner-Ronne Ice Shelf, also known as Ronne-Filchner Ice Shelf, is an Antarctic ice shelf bordering the Weddell Sea.
South Georgia is an island in the South Atlantic Ocean that is part of the British Overseas Territory of South Georgia and the South Sandwich Islands. It lies around 1,400 kilometres (870 mi) east of the Falkland Islands. Stretching in the east–west direction, South Georgia is around 170 kilometres (106 mi) long and has a maximum width of 35 kilometres (22 mi). The terrain is mountainous, with the central ridge rising to 2,935 metres (9,629 ft) at Mount Paget. The northern coast is indented with numerous bays and fjords, serving as good harbours.
The Larsen Ice Shelf is a long ice shelf in the northwest part of the Weddell Sea, extending along the east coast of the Antarctic Peninsula from Cape Longing to Smith Peninsula. It is named after Captain Carl Anton Larsen, the master of the Norwegian whaling vessel Jason, who sailed along the ice front as far as 68°10' South during December 1893. In finer detail, the Larsen Ice Shelf is a series of shelves that occupy distinct embayments along the coast. From north to south, the segments are called Larsen A, Larsen B, and Larsen C by researchers who work in the area. Further south, Larsen D and the much smaller Larsen E, F and G are also named.
Iceberg B-15 was the largest recorded iceberg by area. It measured around 295 by 37 kilometres, with a surface area of 11,000 square kilometres. Calved from the Ross Ice Shelf of Antarctica in March 2000, Iceberg B-15 broke up into smaller icebergs, the largest of which was named Iceberg B-15-A. In 2003, B-15A drifted away from Ross Island into the Ross Sea and headed north, eventually breaking up into several smaller icebergs in October 2005. In 2018, a large piece of the original iceberg was steadily moving northward, located between the Falkland Islands and South Georgia Island. As of 2021, the U.S. National Ice Center (USNIC) still lists one extant piece of B-15 that meets the minimum threshold for tracking. This iceberg, B-15ab, measures 20 km × 7 km ; it is currently grounded off the coast of Antarctica in the western sector of the Amery region.
Mertz Glacier is a heavily crevassed glacier in George V Coast of East Antarctica. It is the source of a glacial prominence that historically has extended northward into the Southern Ocean, the Mertz Glacial Tongue. It is named in honor of the Swiss explorer Xavier Mertz.
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.
Thwaites Glacier, also known as the Doomsday Glacier, is an unusually broad and vast Antarctic glacier flowing into Pine Island Bay, part of the Amundsen Sea, east of Mount Murphy, on the Walgreen Coast of Marie Byrd Land. Its surface speeds exceed 2 kilometres per year near its grounding line. Its fastest flowing grounded ice is centered between 50 and 100 kilometres east of Mount Murphy. In 1967, the Advisory Committee on Antarctic Names named the glacier after Fredrik T. Thwaites (1883–1961), a glacial geologist, geomorphologist and professor emeritus at the University of Wisconsin–Madison. The historian Reuben Gold Thwaites was his father.
Jakobshavn Glacier, also known as Ilulissat Glacier, is a large outlet glacier in West Greenland. It is located near the Greenlandic town of Ilulissat and ends at the sea in the Ilulissat Icefjord.
An ice tongue is a long and narrow sheet of ice projecting out from the coastline. An ice tongue forms when a valley glacier moves very rapidly out into the ocean or a lake. They can gain mass from water freezing at their base, or by snow falling on top of them. Mass is then lost by calving or by melting. Ice tongues can range in length from .5 kilometres to 69 kilometres. Icebergs are often formed when ice tongues break off in part or wholly from the main glacier. Two examples of ice tongues are the Erebus Ice Tongue and the Drygalski Ice Tongue.
Jorge Montt Glacier is a tidewater glacier located in the Aisén Region of Chile, south of the town of Caleta Tortel. It lies at the north end of the Southern Patagonian Ice Field, within Bernardo O'Higgins National Park. The mouth of Pascua River is located in the vicinity of the glacier calving front.
Grey Glacier is a glacier in the Southern Patagonian Ice Field, just west of the Cordillera del Paine. It flows southward into the lake of the same name. Before dividing in two at its front end, the glacier is 6 kilometers wide and over 30 meters high. In 1996, it occupied a total area of 270 km2 (100 sq mi) and a length of 28 km (17 mi). In November 2017 a large iceberg broke off the glacier.
The Erebus Ice Tongue is a mountain outlet glacier and the seaward extension of Erebus Glacier from Ross Island. It projects 11 kilometres (6.8 mi) into McMurdo Sound from the Ross Island coastline near Cape Evans, Antarctica. The glacier tongue varies in thickness from 50 metres (160 ft) at the snout to 300 metres (980 ft) at the point where it is grounded on the shoreline. Explorers from Robert F. Scott's Discovery Expedition (1901–1904) named and charted the ice tongue.
Eric J. Rignot is a Chancellor Professor of Earth system science at the University of California, Irvine, and Senior Research Scientist for the Radar Science and Engineering Section at NASA's Jet Propulsion Laboratory.
Ice calving, also known as glacier calving or iceberg calving, is the breaking of ice chunks from the edge of a glacier. It is a form of ice ablation or ice disruption. It is the sudden release and breaking away of a mass of ice from a glacier, iceberg, ice front, ice shelf, or crevasse. The ice that breaks away can be classified as an iceberg, but may also be a growler, bergy bit, or a crevasse wall breakaway.
Petermann Glacier is a large glacier located in North-West Greenland to the east of Nares Strait. It connects the Greenland ice sheet to the Arctic Ocean at 81°10' north latitude, near Hans Island.
Ilulissat Icefjord is a fjord in western Greenland. Located 250 km north of the Arctic Circle, the Ilulissat Icefjord runs west 40 km (25 mi) from the Greenland ice sheet to Disko Bay just south of Ilulissat town. Ilulissat Icefjord was declared a UNESCO World Heritage Site in 2004 because of its natural beauty and the importance of the fast-moving Jakobshavn Glacier in developing the current scientific understanding of anthropogenic climate change.
Iceberg B-31 is a large iceberg that formed in November 2013, when it separated from the Pine Island Glacier. B-31 is heading into the Antarctic ocean, which may have possible repercussions for international shipping. Soon it would not be possible to track the iceberg as the winter darkness completely hides it. The ice island is 20 miles by 12 miles and 500 m of height. It was first observed by Moderate Resolution Imaging Spectroradiometer (MODIS), an instrument on NASA's Terra and Aqua satellites of NASA.
References
- 1 2 "Antarctic: Nasa shares close-up photos of big PIG iceberg". BBC News. 9 November 2018. Retrieved 2018-11-10.
- ↑ "Pine Island Glacier Quickly Drops Another Iceberg". Nasa Earth Observatory. NASA. 8 November 2018. Retrieved 12 November 2018.
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