Thuronyi Bluff

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Location of Foyn Coast on Antarctic Peninsula. Ant-pen-Foyn.PNG
Location of Foyn Coast on Antarctic Peninsula.

Thuronyi Bluff ( 66°48′S64°45′W / 66.800°S 64.750°W / -66.800; -64.750 ) is a prominent escarpment on the east coast of the Antarctic Peninsula, which faces the Larsen Ice Shelf and the Weddell Sea and lies immediately south of the Antarctic Circle. It is located above Mill Inlet in British Antarctic Territory at the base of the Cole Peninsula, between Balch Glacier and Gould Glacier; it is part of Graham Land. [1] The bluff was first observed in aerial photographs taken on December 22, 1947, during the Ronne Antarctic Research Expedition. [2]

Just north of Thuronyi Bluff, the Larsen Ice Shelf once extended a hundred kilometers (or more) from land before any open sea would be encountered. However, part of the shelf larger than the state of Rhode Island, known as "Larsen B", disintegrated over a three-week period in 2002, which followed a similar disintegration of the equivalently sized "Larsen A" region in 1995. [3] It is anticipated that "Larsen C", which lies at the foot of Thuronyi Bluff, may suffer a similar fate sometime in the next decade, [4] after which open seawater will likely come near to Thuronyi Bluff during the austral summertime.

Namesake

This escarpment is named for Géza T. Thuronyi (1919-2007), an Antarctic scholar at the Library of Congress, whose annotated bibliographies of the meteorological and geoastrophysical characteristics of Earth's cold regions did much to make often obscure publications more available to both the scientific community and the public. [5] The name was applied by the Advisory Committee on Antarctic Names upon Mr. Thuronyi's retirement in 1990, in recognition of his contributions in unveiling the nature of the Antarctic continent. [6]

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Ross Ice Shelf Ice shelf in Antarctica

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Ice shelf Large floating platform of ice caused by glacier flowing onto ocean surface

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Filchner–Ronne Ice Shelf Ice shelf in Antarctica

The Filchner-Ronne Ice Shelf, also known as Ronne-Filchner Ice Shelf, is an Antarctic ice shelf bordering the Weddell Sea.

Antarctic Peninsula Peninsula located in northern Antarctica

The Antarctic Peninsula, known as O'Higgins Land in Chile and Tierra de San Martin in Argentina, and originally as the Palmer Peninsula in the US and Graham Land in the United Kingdom, is the northernmost part of the mainland of Antarctica.

Alexander Island Island in the Bellingshausen Sea off Antarctica

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Thurston Island Antarctic island

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West Antarctic Ice Sheet Segment of the continental ice sheet that covers West (or Lesser) Antarctica

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Larsen Ice Shelf Ice shelf in Antarctica

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.

Cole Peninsula

Cole Peninsula is a peninsula, 24 kilometers long in an east–west direction and 13 kilometers wide, lying between Cabinet Inlet and Mill Inlet on the east coast of Graham Land, just east of Thuronyi Bluff and immediately north of the Antarctic Circle. The peninsula is surrounded by the Larsen Ice Shelf, which is part of the Weddell Sea.

The Ronne Antarctic Research Expedition (RARE) was an expedition from 1947–1948 which researched the area surrounding the head of the Weddell Sea in Antarctica.

Nordenskjöld Coast Coast in Antarctica

The Nordenskjöld Coast is located on the Antarctic Peninsula, more specifically Graham Land, which is the top region of the Peninsula. The Peninsula is a thin, long ice sheet with an Alpine-style mountain chain. The coast consists of 15m tall ice cliffs with ice shelves.

Scott Glacier (Transantarctic Mountains)

The Scott Glacier is a major glacier, 120 miles (190 km) long, that drains the East Antarctic Ice Sheet through the Queen Maud Mountains to the Ross Ice Shelf. The Scott Glacier is one of a series of major glaciers flowing across the Transantarctic Mountains, with the Amundsen Glacier to the west and the Leverett and Reedy glaciers to the east.

Ice calving

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.

Crane Glacier Glacier in the Aristotle Mountains of the Antarctic Peninsula

Crane Glacier, is a narrow glacier which flows 30 miles (50 km) in an east-northeasterly direction along the northwest side of Aristotle Mountains to enter Spillane Fjord south of Devetaki Peak, on the east coast of the Antarctic Peninsula. Sir Hubert Wilkins photographed this feature from the air in 1928 and gave it the name "Crane Channel", after C.K. Crane of Los Angeles, reporting that it appeared to be a channel cutting in an east-west direction across the peninsula. The name was altered to "Crane Inlet" following explorations along the west coast of the peninsula in 1936 by the British Graham Land Expedition, which proved that no through channel from the east coast existed as indicated by Wilkins. Comparison of Wilkins' photograph of this feature with those taken in 1947 by the Falklands Islands Dependencies Survey shows that Wilkins' "Crane Channel" is this glacier, although it lies about 75 miles (120 km) northeast of the position originally reported by Wilkins.

Wilkins Sound

Wilkins Sound is a seaway in Antarctica that is largely occupied by the Wilkins Ice Shelf. It is located on the southwest side of the Antarctic Peninsula between the concave western coastline of Alexander Island and the shores of Charcot Island and Latady Island farther to the west.

Weyerhaeuser Glacier is a large glacier flowing north into Mercator Ice Piedmont close west of Mobiloil Inlet, on the east coast of Antarctic Peninsula. This glacier lies in the area first explored from the air by Sir Hubert Wilkins in 1928 and Lincoln Ellsworth in 1935, but it was first clearly delineated in aerial photographs taken by the United States Antarctic Service (USAS) in 1940. The glacier was resighted in 1947 by the Ronne Antarctic Research Expedition (RARE) under Ronne. He named it for F. K. Weyerhaeuser, of the Weyerhaeuser Timber Co., who contributed lumber and insulating material to the expedition.

Evans Glacier (Graham Land)

Evans Glacier is a gently-sloping glacier 15 nautical miles (28 km) long and 4 nautical miles (7 km) wide, draining the southeast slopes of Travnik Buttress eastwards between Rugate Ridge and Poibrene Heights to flow into Vaughan Inlet on the east coast of Graham Land, Antarctica. It was discovered by Sir Hubert Wilkins in an aerial flight, December 20, 1928, and named "Evans Inlet" by him for E.S. Evans of Detroit. A further survey by the Falkland Islands Dependencies Survey in 1955 reported that this low-lying area is not an inlet, but is formed by the lower reaches of Hektoria Glacier and the feature now described.

Tindal Bluff is a rocky headland rising to 800 m between the terminus of Fricker Glacier and Monnier Point on the east coast of Graham Land. This coastal area was photographed by several American expeditions: United States Antarctic Service (USAS), 1939–41; Ronne Antarctic Research Expedition (RARE), 1947–48; U.S. Navy photos, 1968. Mapped by Falkland Islands Dependencies Survey (FIDS), 1947–48. Named by United Kingdom Antarctic Place-Names Committee (UK-APC) for Ronald Tindal, General Assistant with the British Antarctic Survey (BAS) Larsen Ice Shelf party in 1963–64.

References

  1. "Name Details, Thuronyi Bluff" Antarctic Gazetteer, Australian Antarctic Data Centre, online
  2. Tupek, Karen Ronne (2006) "Captain Finn Ronne: Norwegian-American Antarctic Explorer" website of Ronne Family Antarctic Explorers, online
  3. Hulbe, Christina (2002) "Larsen Ice Shelf 2002, warmest summer on record leads to disintegration" website of Portland State University, online
  4. Rignot, Eric (2007) "Mass Balance and Ice Dynamics of Antarctic Peninsula Glaciers for IPY2007-2008" Proposal #359, International Polar Year Expression of Intent, online
  5. Holley, Joe (2008) "Geza T. Thuronyi, 88; Bibliographer for Library of Congress" Washington Post 1/4/08, p. B07, online
  6. US-ACAN "Policy Covering Antarctic Names" website of US Geological Survey, online