Cook Ice Cap | |
---|---|
Calotte Glaciaire Cook | |
Type | Ice cap |
Location | Kerguelen, Southern Indian Ocean |
Coordinates | 49°18′50″S69°02′29″E / 49.31389°S 69.04139°E |
Area | 400 km2 (150 sq mi) |
Length | 28 kilometres (17 mi) |
Thickness | 400 m (1,300 ft) average |
Terminus | Outlet glaciers |
Status | Retreating |
The Cook Ice Cap or Cook Glacier (French : Calotte Glaciaire Cook [1] or Glacier Cook) is a large ice cap in the Kerguelen Islands in the French Southern Territories zone of the far Southern Indian Ocean.
The Cook Ice Cap reaches a maximum elevation of 1,049 metres (3,442 ft) in its central area. [2] It had a surface of approximately 500 km2 (190 sq mi) in 1963, having shrunk to about 400 km2 (150 sq mi) in recent times. [3]
Named after British explorer James Cook (1728–1779), on French navigational charts of the early 20th century this ice cap appears as 'Glacier Richthofen' [4]
About sixty glaciers flow from the inner ice cap in a roughly radial pattern. At the feet of the snout of these outlet glaciers there are often terminal moraines with dammed lakes of varying sizes. Further down the glacial meltwaters have formed numerous outwash plains at certain, mostly inland, locations. Of the glaciers originating in the Cook Ice Cap, only the Pasteur and Mariotte Glaciers have their termini in the Indian Ocean at the Anse des Glaçons in southwestern Kerguelen's deeply indented coastline.<ref name="IPFPEV">Institut polaire français Paul Émile Victor : La fonte spectaculaire du plus gros glacier français <{Citation
| author1=Institut geographique national (France). | author2=Terres australes et antarctiques francaises. | title=Terres australes et antarctiques francaises | year=1968 | scale=Scale 1:200 000 ; | section=1 map : col. ; 90 x 100 cm. | location=Paris | publisher=L'Institut | url=http://nla.gov.au/nla.obj-2549274089 | id=nla.obj-2549274089 | access-date=15 December 202 | via=Trove}>
The following are the main glaciers listed clockwise:
The French Southern and Antarctic Lands is an overseas territory of France. It consists of:
The Kerguelen Islands, also known as the Desolation Islands, are a group of islands in the sub-Antarctic region. They are among the most isolated places on Earth, with the closest territory being the Heard Island and McDonald Islands territory of Australia located at roughly 450 km (240 nmi), and the nearest inhabited territory being Madagascar at more than 3,300 kilometres in distance. The islands, along with Adélie Land, the Crozet Islands, Amsterdam and Saint Paul islands, and France's Scattered Islands in the Indian Ocean, are part of the French Southern and Antarctic Lands and are administered as a separate district.
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The French Antarctic Expedition is any of several French expeditions in Antarctica.
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Antarctica is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern 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).
Louis Francois Marie Aleno de Saint Aloüarn was a French Navy officer and explorer who claimed French Western Australia.
The era of European and American voyages of scientific exploration followed the Age of Discovery and were inspired by a new confidence in science and reason that arose in the Age of Enlightenment. Maritime expeditions in the Age of Discovery were a means of expanding colonial empires, establishing new trade routes and extending diplomatic and trade relations to new territories, but with the Enlightenment scientific curiosity became a new motive for exploration to add to the commercial and political ambitions of the past. See also List of Arctic expeditions and List of Antarctic expeditions.
Scientific ice drilling began in 1840, when Louis Agassiz attempted to drill through the Unteraargletscher in the Alps. Rotary drills were first used to drill in ice in the 1890s, and thermal drilling, with a heated drillhead, began to be used in the 1940s. Ice coring began in the 1950s, with the International Geophysical Year at the end of the decade bringing increased ice drilling activity. In 1966, the Greenland ice sheet was penetrated for the first time with a 1,388 m hole reaching bedrock, using a combination of thermal and electromechanical drilling. Major projects over the following decades brought cores from deep holes in the Greenland and Antarctic ice sheets.
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The Kerguelen Islands, an archipelago in the southern Indian Ocean, were discovered uninhabited on February 12, 1772 by Breton navigator Yves Joseph de Kerguelen de Trémarec, and have remained without a permanent population ever since. The only residents were during an attempt to set up a farm, a few occasional occupations for whaling activities, and since the 1950s, a French scientific presence. Its toponymy was thus given ex nihilo, by the various explorers, whalers and sealers who frequented its waters and anchorages, and then in the 20th century, once French possession of the archipelago had been reaffirmed, by a few French institutions.