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Ice Pier
An ice pier or ice wharf is a man-made structure used to assist the unloading of ships in Antarctica. It is constructed by pumping seawater into a contained area and allowing the water to freeze. By repeating this procedure several times, additional layers are built up. The final structure is many metres in thickness, and strong enough to support container trucks. Operation Deep Freeze personnel constructed the first floating ice pier at Antarctica’s southernmost sea port at McMurdo Station in 1973."Unique ice pier provides harbor for ships," Antarctic Sun. January 8, 2006; McMurdo Station, Antarctica. Ice piers have been in use each season since, at McMurdo's natural [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USNS Southern Cross At The Ice Pier In 1983
United States Naval Ship (USNS) is the ship prefix, prefix designation given to non-ship commissioning, commissioned ships that are property of the United States Navy (USN). Definition United States Naval Ships are unarmed auxiliary ship, auxiliary support vessels owned by the U.S. Navy and operated in non-commissioned service by Military Sealift Command with a civilian crew. Some ships include a small military complement to carry out communication and special mission functions, or for force protection. In comparison, U.S. Navy ships commissioned into service have the designation "United States Ship, USS" and are armaments, armed, crewed by U.S. Navy personnel, and held in property by the United States Government. Additionally, the United States Naval Ships hull classification symbol begins with "T-" to denote its civilian crew. The USNS prefix can be assigned only while the ship is owned by the U.S. Navy. If, after being taken out of service, the ship is transferred to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Pole
The South Pole, also known as the Geographic South Pole, Terrestrial South Pole or 90th Parallel South, is one of the two points where Earth's axis of rotation intersects its surface. It is the southernmost point on Earth and lies antipodally on the opposite side of Earth from the North Pole, at a distance of 12,430 miles (20,004 km) in all directions. Situated on the continent of Antarctica, it is the site of the United States Amundsen–Scott South Pole Station, which was established in 1956 and has been permanently staffed since that year. The Geographic South Pole is distinct from the South Magnetic Pole, the position of which is defined based on Earth's magnetic field. The South Pole is at the centre of the Southern Hemisphere. Geography For most purposes, the Geographic South Pole is defined as the southern point of the two points where Earth's axis of rotation intersects its surface (the other being the Geographic North Pole). However, Earth's axis of rotat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Road
An ice road or ice bridge is a human-made structure that runs on a frozen water surface (a river, a lake or a sea water expanse).Masterson, D. and Løset, S., 2011, ISO 19906: Bearing capacity of ice and ice roads, Proceedings of the 21st International Conference on Port and Ocean Engineering under Arctic Conditions (POAC), Montreal, Canada.Proskin, S.A. and Fitzgerald, A., 2019, Using a limit states approach for ice road design, GeoSt.John's, St. John's.Spencer, P. and Wang, R., 2018, The design width of floating ice roads and effect of longitudinal cracks, Proceedings of the Arctic Technology Conference (ATC), Houston. Ice roads are typically part of a winter road, but they can also be simple stand-alone structures, connecting two shorelines.Michel, B., Drouin, M., Lefebvre, L.M., Rosenberg, P. and Murray, R., 1974, Ice bridges of the James Bay Project. Canadian Geotechnical Journal, 11, p. 599-619.Goff, R.D. and Masterson, D.M., 1986, Construction of a sprayed ice island for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iceport
An iceport is a more-or-less permanent indentation in the front of an ice shelf, that can serve as a natural ice harbour. 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icebreaker
An icebreaker is a special-purpose ship or boat designed to move and navigate through ice-covered waters, and provide safe waterways for other boats and ships. Although the term usually refers to ice-breaking ships, it may also refer to smaller vessels, such as the icebreaking boats that were once used on the canals of the United Kingdom. For a ship to be considered an icebreaker, it requires three traits most normal ships lack: a strengthened hull, an ice-clearing shape, and the power to push through sea ice. Icebreakers clear paths by pushing straight into frozen-over water or pack ice. The bending strength of sea ice is low enough that the ice breaks usually without noticeable change in the vessel's trim. In cases of very thick ice, an icebreaker can drive its bow onto the ice to break it under the weight of the ship. A buildup of broken ice in front of a ship can slow it down much more than the breaking of the ice itself, so icebreakers have a specially designed hull to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Ocean
The Southern Ocean, also known as the Antarctic Ocean, comprises the southernmost waters of the World Ocean, generally taken to be south of 60° S latitude and encircling Antarctica. With a size of , it is regarded as the second-smallest of the five principal oceanic divisions: smaller than the Pacific, Atlantic, and Indian oceans but larger than the Arctic Ocean. Over the past 30 years, the Southern Ocean has been subject to rapid climate change, which has led to changes in the marine ecosystem. By way of his voyages in the 1770s, James Cook proved that waters encompassed the southern latitudes of the globe. Since then, geographers have disagreed on the Southern Ocean's northern boundary or even existence, considering the waters as various parts of the Pacific, Atlantic, and Indian oceans, instead. However, according to Commodore John Leech of the International Hydrographic Organization (IHO), recent oceanographic research has discovered the importance of Southern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ross Sea
The Ross Sea is a deep bay of the Southern Ocean in Antarctica, between Victoria Land and Marie Byrd Land and within the Ross Embayment, and is the southernmost sea on Earth. It derives its name from the British explorer James Clark Ross who visited this area in 1841. To the west of the sea lies Ross Island and Victoria Land, to the east Roosevelt Island and Edward VII Peninsula in Marie Byrd Land, while the southernmost part is covered by the Ross Ice Shelf, and is about from the South Pole. Its boundaries and area have been defined by the New Zealand National Institute of Water and Atmospheric Research as having an area of . The circulation of the Ross Sea is dominated by a wind-driven ocean gyre and the flow is strongly influenced by three submarine ridges that run from southwest to northeast. The circumpolar deep water current is a relatively warm, salty and nutrient-rich water mass that flows onto the continental shelf at certain locations. The Ross Sea is covered with ice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jamesway Hut
The Jamesway hut is a portable and easy-to-assemble hut, designed for polar weather conditions. This version of the Quonset hut was created by James Manufacturing Company of Fort Atkinson, Wisconsin. A Jamesway hut had wooden ribs and a type of insulated fabric covering then used by the Army Air Corps. Insulated blankets in 1.2 m (3 ft 11 in)-wide lengths were made with glass fiber insulation faced with flame-proof muslin and enclosed in plastic-treated cotton that was water-, vermin-, and fire-proof. The hardware (nails, fasteners, and connecting bars) was the only metal component. The whole package weighed 540 kg (1,190 lb) for a 5 metres (16 ft)-square hut. Its wooden packing crates were designed for reuse as the hut floor. The storage/floor sections, each were made from plywood and insulated with R-7 fiberglass insulation, which provided a portable, warm and cleanable floor. The wooden arches holding up the roof were attached to the floor secti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Truck Falling Through The Ice Pier In 1983
A truck or lorry is a motor vehicle designed to transport cargo, carry specialized payloads, or perform other utilitarian work. Trucks vary greatly in size, power, and configuration, but the vast majority feature body-on-frame construction, with a cabin that is independent of the payload portion of the vehicle. Smaller varieties may be mechanically similar to some automobiles. Commercial trucks can be very large and powerful and may be configured to be mounted with specialized equipment, such as in the case of refuse trucks, fire trucks, concrete mixers, and suction excavators. In American English, a commercial vehicle without a trailer or other articulation is formally a "straight truck" while one designed specifically to pull a trailer is not a truck but a "tractor". The majority of trucks currently in use are still powered by diesel engines, although small- to medium-size trucks with gasoline engines exist in the US, Canada, and Mexico. The market-share of electrically ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bollard
A bollard is a sturdy, short, vertical post. The term originally referred to a post on a ship or quay used principally for mooring boats. It now also refers to posts installed to control road traffic and posts designed to prevent automotive vehicles from colliding or crashing into pedestrians and structures, whether intentional from ram-raids and vehicle-ramming attacks, or unintentional losses of control. Etymology The term is probably related to bole, meaning a tree trunk. The earliest citation given by the ''Oxford English Dictionary'' (referring to a maritime bollard) dates from 1844, although a reference in the ''Caledonian Mercury'' in 1817 describes bollards as huge posts. History Wooden posts were used for basic traffic management from at least the beginning of the 18th century. An early well-documented case is that of the "two oak-posts" set up next to the medieval Eleanor cross at Waltham Cross, Hertfordshire, in 1721, at the expense of the Society of Antiqua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MV American Tern (T-AK-4729) 200601
MV ''American Tern'' (T-AK-4729) is a container ship managed by APL Maritime. Formerly the Liberian-flagged ''Kariba'', the vessel was renamed ''American Tern'' under the United States flag in 2002. Since then, the ''American Tern'' has been chartered by the United States Navy Military Sealift Command. She was contracted through 2010 to make resupply voyages to McMurdo Station in Antarctica (Operation Deep Freeze) and Thule Air Base in Greenland (Operation Pacer Goose). The vessel is named after the tern Terns are seabirds in the family Laridae that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Terns are treated as a subgroup of the family Laridae which includes gulls and skimmers and consists of e ..., a type of bird that makes annual migrations from the Arctic to the Antarctic. File:MV American Tern at McMurdo Sound.jpg, ''American Tern'' unloading containers at McMurdo Station File:Operation Deep Freeze 2006, MV American Ter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ross Ice Shelf
The Ross Ice Shelf is the largest ice shelf of Antarctica (, an area of roughly and about across: about the size of France). It is several hundred metres thick. The nearly vertical ice front to the open sea is more than long, and between high above the water surface. Ninety percent of the floating ice, however, is below the water surface. Most of Ross Ice Shelf is in the Ross Dependency claimed by New Zealand. It floats in, and covers, a large southern portion of the Ross Sea and the entire Roosevelt Island located in the east of the Ross Sea. The ice shelf is named after Sir James Clark Ross, who discovered it on 28 January 1841. It was originally called "The Barrier", with various adjectives including "Great Ice Barrier", as it prevented sailing further south. Ross mapped the ice front eastward to 160° W. In 1947, the U.S. Board on Geographic Names applied the name "Ross Shelf Ice" to this feature and published it in the original U.S. Antarctic Gazetteer. In Januar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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