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Scotia Sea

Coordinates:57°30′S40°00′W / 57.500°S 40.000°W /-57.500; -40.000
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Sea in the Southern Ocean
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Scotia Sea
Tabular iceberg in the Scotia Sea, 1996
Scotia Sea is located in South Atlantic
Scotia Sea
Scotia Sea
Location of the Scotia Sea
Bathymetric map of the Scotia Sea
Coordinates57°30′S40°00′W / 57.500°S 40.000°W /-57.500; -40.000
TypeSea
Ocean/sea sourcesSouthern Ocean
Surface area900,000 km2 (347,500 sq mi)
Max. depth6,022 m (19,757 ft)

TheScotia Sea is asea located at the northern edge of theSouthern Ocean at its boundary with theSouth Atlantic Ocean. It is bounded on the west by theDrake Passage and on the north, east, and south by theScotia Arc, anundersea ridge andisland arc system supporting various islands. The sea sits atop theScotia Plate. It is named after the expedition shipScotia. Manyicebergs melt there.[1]

Location and description

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Approximate area of the Scotia Sea in theSouthern Hemisphere

The Scotia Sea is the area of water between the Drake Passage,Tierra del Fuego,South Georgia, theSouth Sandwich Islands, theSouth Orkney Islands, and theAntarctic Peninsula. These island groups all sit atop the Scotia Arc, which frames the sea on the north, east, and south. The Scotia Sea covers an area around 900,000 km2 (347,500 sq mi). About half of the sea stands above thecontinental shelf.

History

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The sea was named about 1932 after theScotia, the expedition ship used in these waters by the Scottish National Antarctic Expedition (1902–1904) underWilliam S. Bruce. The most famous traverse of this frigid sea was made near the end of theImperial Trans-Antarctic Expedition in 1916 by SirErnest Shackleton and five others in the adapted lifeboatJames Caird. They leftElephant Island, just off the tip of the Antarctic Peninsula, and reachedSouth Georgia Island two weeks later. It was a distance of nearly 900 miles and the sun was only sighted for navigational fixes four times during the entire journey.

InArgentina, the Scotia Sea is considered part of an area known as theMar Argentino, and several territories claimed but not occupied by Argentina, such as South Georgia and the Falkland Islands, lie within this region.

Flora and fauna

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The islands bordering the Scotia Sea are rocky and partly covered in ice and snow year round. Despite these harsh conditions, however, the islands do support vegetation. They have been described as theScotia Sea Islands tundraecoregion, which includes South Georgia, the volcanic South Sandwich Islands, and the South Orkneys in the Scotia Sea, as well as the remoteSouth Shetland Islands near the Antarctic Peninsula and the small isolated volcano calledBouvet Island. All these islands lie in the cold seas below theAntarctic Convergence. These areas supporttundra vegetation consisting ofmosses,lichens, andalgae, while seabirds, penguins, and seals feed in the surrounding waters.

Seabirds include four main species of albatross: black-browed albatross(Thalassarche melanophris), grey-headed albatross(Thalassarche chrysostoma), light-mantled albatross(Phoebetria palpebrata), and snowy albatross(Diomedea exulans). Only five species of land birds remain on the islands, and these include an endemic race of the yellow-billed pintail duck(Anas georgica) and the endemic South Georgia pipit(Anthus antarcticus). Other birds include thesouthern giant petrel, with sizeable colonies onBird Island.

Penguin species found here include large numbers ofking penguins on South Georgia especially, as well aschinstrap penguin,macaroni penguin,gentoo penguin,Adelie penguin, and rockhopper penguin(Eudyptes chrysocome).

Seals include the Antarctic fur seal(Arctocephalus gazella) and sub-Antarctic fur seal(Arctocephalus tropicalis) in large numbers,leopard seal(Hydrurga leptonyx),Weddell seal(Leptonychotes weddellii), the hugesouthern elephant seal(Mirounga leonina), andcrabeater seal(Lobodon carcinophagus).[2]

Threats and preservation

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Map of the Scotia Sea. Toponyms: Undersea relief, maritime, nearby lands, countries and cities. Isobath interval: 2000 m

Although theScotia Arc islands have a harsh climate and have never been permanently occupied, they have long been used as a base for fishing and seal hunting. Wildlife on these remote islands is threatened byintroduced species, especially on South Georgia, where even large animals, including (now removed)reindeer, have been brought to the islands. Further damage to ecosystems results from overfishing. South Georgia, the South Sandwich Islands, and Bouvet Island are protected as nature reserves, withBird Island, South Georgia, being asite of special scientific interest. The seals are further protected by international agreements, and fur seal populations are recovering.

See also

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References

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  1. ^"Antarctica's iceberg graveyard could reveal the ice sheet's future".Science News. 2019-04-09. Retrieved2020-02-28.
  2. ^"Marielandia Antarctic tundra".Terrestrial Ecoregions. World Wildlife Fund.

Public Domain This article incorporatespublic domain material from"Scotia Sea".Geographic Names Information System.United States Geological Survey. Edit this at Wikidata

Antarctic/Southern Ocean
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