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Emerald Icefalls
The Emerald Icefalls () are icefalls along the north side of Ezcurra Inlet, Admiralty Bay, King George Island, in the South Shetland Islands. They were so named by the Polish Antarctic Expedition, 1980, from the color of the serac A serac (from Swiss French ''sérac'') is a block or column of glacial ice, often formed by intersecting crevasses on a glacier. Commonly house-sized or larger, they are dangerous to mountaineers, since they may topple with little warning. Even .... References Icefalls of Antarctica {{KingGeorgeIslandAQ-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icefall
An icefall is a portion of certain glaciers characterized by relatively rapid flow and chaotic crevassed surface, caused in part by gravity. The term ''icefall'' is formed by analogy with the word ''waterfall'', which is a similar phenomenon of the liquid phase but at a more spectacular speed. When ice movement of a glacier is faster than elsewhere, because the glacier bed steepens or narrows, and the flow cannot be accommodated by plastic deformation, the ice fractures, forming crevasses. Where two fractures meet, seracs (or ice towers) can be formed. When the movement of the ice slows down, the crevasses can coalesce, resulting in the surface of the glacier becoming smoother. Ice flow Perhaps the most conspicuous consequence of glacier flow, icefalls occur where the glacier bed steepens and/or narrows. Most glacier ice flows at speeds of a few hundred metres per year or less. However, the flow of ice in an icefall may be measured in kilometres per year. Such rapid flow cannot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ezcurra Inlet
Ezcurra Inlet () is an inlet forming the western arm of Admiralty Bay, King George Island, in the South Shetland Islands. It was charted by the French Antarctic Expedition, 1908–10, under Jean-Baptiste Charcot, and named "Fiord Ezcurra" after Pedro de Ezcurra, an Argentine politician and Minister of Agriculture in 1908, who assisted the French expedition. Shortly after this area was charted, a mariner's guide to the region stated that "the western fijord does not appear to offer good anchorage, as it is too exposed to squalls." Additionally, it was said to have not been used by whalers who frequented the waters due to the ice floes that blocked access to Admiralty Bay. Hervé Cove indents the south side of the inlet, southwest of Point Thomas. It was charted by the French Antarctic Expedition under Charcot, and named by him for a member of the expedition. Italia Valley lies east-northeast. See also *Emerald Icefalls The Emerald Icefalls () are icefalls along the north si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Admiralty Bay (South Shetland Islands)
Admiralty Bay is an irregular bay, wide at its entrance between Demay Point and Martins Head, indenting the southern coast of King George Island for , in the South Shetland Islands of Antarctica. The name appears on a map of 1822 by Captain George Powell, a British sailor, and is now established in international usage. The Henryk Arctowski Polish Antarctic Station is situated on the bay, as is the Comandante Ferraz Brazilian Antarctic Base. It has been designated an Antarctic Specially Managed Area (ASMA 1). Description The bay has three fjords: Martel, Mackellar, and Ezcurra. A mariner's guide to the region pronounced the bay to have the best anchorage of any in the South Shetlands, "being well-sheltered all around and having moderate depths over a bottom of good, stiff clay. Ice from the glaciers is frequently troublesome." Chilean scientists have claimed that Amerinds visited the area, due to stone artifacts recovered from bottom-sampling operations in the bay. how ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
King George Island (South Shetland Islands)
King George Island ( Argentinian Spanish: Isla 25 de Mayo, Chilean Spanish: Isla Rey Jorge, Russian: Ватерло́о Vaterloo) is the largest of the South Shetland Islands, lying off the coast of Antarctica in the Southern Ocean. The island was named after King George III. Geography King George island has three major bays, Maxwell Bay, Admiralty Bay, and King George Bay. Admiralty Bay contains three fjords, and is protected as an Antarctic Specially Managed Area under the Protocol on Environmental Protection to the Antarctic Treaty. History The island was first claimed for Britain on 16 October 1819, formally annexed by Britain as part of the Falkland Islands Dependencies in 1908, and now as part of the separate British Antarctic Territory. The Island was claimed by Chile in 1940, as part of the Chilean Antarctic Territory. It was also claimed by Argentina in 1943, now as part of Argentine Antarctica, called by the Argentines ''Isla Veinticinco de Mayo'' (25 May) in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Shetland Islands
The South Shetland Islands are a group of Antarctic islands with a total area of . They lie about north of the Antarctic Peninsula, and between southwest of the nearest point of the South Orkney Islands. By the Antarctic Treaty of 1959, the islands' sovereignty is neither recognized nor disputed by the signatories and they are free for use by any signatory for non-military purposes. The islands have been claimed by the United Kingdom since 1908 and as part of the British Antarctic Territory since 1962. They are also claimed by the governments of Chile (since 1940, as part of the Antártica Chilena province) and Argentina (since 1943, as part of Argentine Antarctica, Tierra del Fuego Province). Several countries maintain research stations on the islands. Most of them are situated on King George Island, benefitting from the airfield of the Chilean base Eduardo Frei. There are sixteen research stations in different parts of the islands, with Chilean stations bein ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polish Antarctic Expedition
The Polish Antarctic Expedition to the A. B. Dobrowolski Polar Station was conducted by a team of doctors, geophysicists, and geomorphologists between 1978 and 1979. It was sponsored by the Polish Academy of Sciences. This was the third expedition organised by the Polish Academy of Sciences, and included establishing a geodetic network in the Bunger Oasis, setting up an astronomical reference point, magnetic observations, and photogrammetric surveys to make maps of the vicinity of the station. Geodetic Network A geodetic network was established in the Bunger Oasis by Dr. A. Pachuta and Dr. J. Cisak, using theodolites Wild T2 and distancemeters Zeiss EOK, and consisted of 26 points.Polish Geodetic Antarctic Studies - A short historical outline, Sledzinski, Janusz. July 16, 1999 Features named by the expedition * Dalmor Bank, named after the expedition ship ''Dalmor'' * Gdynia Point, named after Gdynia, Poland * Klekowski Crag, named after Professor Romuald Klekowski * Moby Dick Ic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serac
A serac (from Swiss French ''sérac'') is a block or column of glacial ice, often formed by intersecting crevasses on a glacier. Commonly house-sized or larger, they are dangerous to mountaineers, since they may topple with little warning. Even when stabilized by persistent cold weather, they can be an impediment to glacier travel. Seracs are found within an icefall, often in large numbers, or on ice faces on the lower edge of a hanging glacier. Notable examples of the overhanging glacier edge type are well-known obstacles on some of the world's highest mountains, including K2 at " The Bottleneck" and Kanchenjunga on the border of India and Nepal. Significant seracs in the Alps are found on the northeast face of Piz Roseg, the north face of the Dent d'Hérens, and the north face of Lyskamm. Incidents * On a 1969–1970 Japanese expedition to Mount Everest, Kyak Tsering was killed by a falling serac. * In 1990, an earthquake caused a block of serac to fall off Lenin Peak, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
