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An iceport is a more-or-less permanent indentation in the front of an ice shelf, that can serve as a natural ice harbor. Though useful, they are not always reliable, as calving of surrounding ice shelves can render an iceport temporarily unstable and unusable. ==Historical and present use of iceports== Iceports have played a critical role in Antarctic exploration. For example, the Bay of Whales (discovered and named by Ernest Shackleton in the ''Nimrod'' in 1908) served as the base for several important Antarctic expeditions, including: * 1910-1912: Amundsen's South Pole expedition, led by Roald Amundsen * 1928-1930: Richard Evelyn Byrd - First expedition * 1933-1935: Richard Evelyn Byrd - Second expedition * 1939-1941: United States Antarctic Service Expedition, led by Richard Evelyn Byrd Norsel Iceport was used by the Norwegian-British-Swedish Antarctic Expedition (NBSAE) to moor and unload the expedition ship in 1949. The NBSAE established Maudheim Station about 1 mile south of the iceport. The term ''iceport'' was first suggested by the Advisory Committee on Antarctic Names (US-ACAN) in 1956 to denote "ice shelf embayments, subject to configuration changes, which may offer anchorage or possible access to the upper surface of an ice shelf via ice ramps along one or more sides of the feature". Prior to the invention of the ice pier, U.S. ships participating in Operation Deep Freeze discharged cargo at temporary iceports in McMurdo Sound. At that time, freighters and tankers arriving with supplies and fuel were forced to dock as far away as 16 km from the harbor. Ships would moor alongside seasonal pack ice, where longshoremen would offload cargo onto large sleds. Snowcats and tractors would then be used to tow the freight over ice to McMurdo Station, a difficult and potentially dangerous operation. U.S. Navy engineers constructed the first floating ice pier at McMurdo Station, Antarctica’s southernmost sea port, in 1973.〔(U.S. Polar Programs ) National Science Foundation FY2000.〕〔("Unique ice pier provides harbor for ships," ) Antarctic Sun. January 8, 2006; McMurdo Station, Antarctica.〕 Since that time, the use of iceports has declined but not been completely eliminated. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「iceport」の詳細全文を読む スポンサード リンク
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