An ice rise is a clearly defined elevation of the otherwise very much flatter ice shelf , typically dome-shaped and rising several hundreds of metres above the surrounding ice shelf . An ice rise forms where the ice shelf touches the seabed due to a locally increased elevation of the seabed, which however remains below sea level. (In contrast, an elevation in the seabed that extends above sea level is defined as an island). The ice shelf flows over the seabed elevation, completely covering it with ice, thereby forming an ice rise. The resulting stress increases cause crevasse formation around the ice rise.
5-614: The McDonald Ice Rumples ( 75°28′S 26°18′W / 75.467°S 26.300°W / -75.467; -26.300 ) constitute an ice rise in the Brunt Ice Shelf bordering the Weddell Sea in Antarctica , covering an area of 3 by 2 nautical miles (6 by 4 km). Ernest Shackleton 's Imperial Trans-Antarctic Expedition reported a glacier in this vicinity in January 1915. It
10-431: Is a stub . You can help Misplaced Pages by expanding it . Ice rise An island within and totally covered by the ice shelf may appear the same as an ice rise. Elaborate measurements may be required to distinguish between these two geographic features. Although ice rises are typically located within the ice shelf area, they can partially face the open sea. Ice rises are found within the ice shelves of Antarctica . There
15-600: Is also one found associated with the Ward Hunt Ice Shelf and it is called the Ward Hunt Ice Rise. The largest ice rises exceed dimensions of 50 by 200 km (31 by 124 mi), or 10,000 km (3,900 sq mi) in area. Some ice rises are incorrectly called islands, but also a few totally ice-covered islands within an ice shelf are also called ice rises. Ice rises are of scientific significance because they (a) exert considerable buttressing, which affects
20-642: The maximum elevation above the general surface of the ice shelf , a few hundred metres from the ice front, was about 18 metres (60 ft). It has now been identified with "Allan McDonald Glacier" and, for the sake of historical continuity, the UK Antarctic Place-names Committee has given the name McDonald to these ice rumples. [REDACTED] This article incorporates public domain material from "McDonald Ice Rumples" . Geographic Names Information System . United States Geological Survey . This Coats Land location article
25-641: Was named "Allan McDonald Glacier" after Allan McDonald of the British Association of Magallanes at Punta Arenas , who was chiefly responsible for raising funds for sending the schooner Emma on the third attempt, in July 1916, to rescue the 22 men of the Endurance left on Elephant Island . The Royal Society International Geophysical Year expeditions occupied Halley Research Station nearby (1955–59) and were familiar with this feature, reporting in 1957 that
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