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Ice Calving
Ice calving, also known as glacier calving or iceberg calving, is the breaking of ice chunks from the edge of a glacier.Essentials of Geology, 3rd edition, Stephen Marshak 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.Glossary of Glacier Terms Ellin Beltz, 2006. Retrieved July 2009. Calving of glaciers is often accompanied by a loud cracking or booming sound before blocks of ice up to high break loose and crash into the water. The entry of the ice into the water causes large, and often hazardous waves. The waves formed in locations like [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buoyancy
Buoyancy (), or upthrust, is the force exerted by a fluid opposing the weight of a partially or fully immersed object (which may be also be a parcel of fluid). In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus, the pressure at the bottom of a column of fluid is greater than at the top of the column. Similarly, the pressure at the bottom of an object submerged in a fluid is greater than at the top of the object. The pressure difference results in a net upward force on the object. The magnitude of the force is proportional to the pressure difference, and (as explained by Archimedes' principle) is equivalent to the weight of the fluid that would otherwise occupy the submerged volume of the object, i.e. the Displacement (fluid), displaced fluid. For this reason, an object with average density greater than the surrounding fluid tends to sink because its weight is greater than the weight of the fluid it displaces. If the objec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chasing Ice
''Chasing Ice'' is a 2012 documentary film about the efforts of nature photographer James Balog and his Extreme Ice Survey (EIS) to publicize the effects of climate change. The film was directed by Jeff Orlowski. It was released in the United States on November 16, 2012. The documentary includes scenes from a glacier calving event that took place at Jacobshavn Isbræ in Greenland, lasting 75 minutes, the longest such event ever captured on film. Two EIS videographers waited several weeks in a small tent overlooking the glacier and, finally, witnessed of ice crashing off the glacier. "The calving of a massive glacier believed to have produced the ice that sank the ''Titanic'' is like watching a city break apart." Synopsis Environmental photographer James Balog heads to Greenland, Iceland and Alaska in order to capture images that will help to convey the effects of global warming. Balog was initially skeptical about climate change when the issue entered scientific discussion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lower Manhattan
Lower Manhattan, also known as Downtown Manhattan or Downtown New York City, is the southernmost part of the Boroughs of New York City, New York City borough of Manhattan. The neighborhood is History of New York City, the historical birthplace of New York City and for its first 225 years was the entirety of the city. Lower Manhattan serves as Government of New York City, the seat of government of both Manhattan and the entire City of New York. Because there are no municipally defined boundaries for the neighborhood, a precise population cannot be quoted, but several sources have suggested that it was one of the fastest-growing locations in New York City between 2010 and 2020, related to the influx of young adults and significant development of new housing units. Despite various definitions of Lower Manhattan, they generally include all of Manhattan, Manhattan Island south of 14th Street (Manhattan), 14th Street, with the Bowling Green (New York City), Bowling Green and The Batte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Balog
James Balog (born July 15, 1952) is an American photographer and the founder and director of Earth Vision Institute in Boulder, Colorado. In 2017, Balog founded the Extreme Ice Survey, a project that documents glacial melting. Balog has photographed subjects such as endangered animals, North America's old-growth forests, and polar ice. In 1996, Balog was commissioned by the U.S. Postal Service to create a complete set of stamps.James Balog National Geographic In 2024, Balog received an Honorary Fellowship from The Royal Photographic Society. He is a senior Fellow of the International League of Conservation Photographers. ...
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Fjord
In physical geography, a fjord (also spelled fiord in New Zealand English; ) is a long, narrow sea inlet with steep sides or cliffs, created by a glacier. Fjords exist on the coasts of Antarctica, the Arctic, and surrounding landmasses of the northern and southern hemispheres. Norway's coastline is estimated to be long with its nearly 1,200 fjords, but only long excluding the fjords. Formation A true fjord is formed when a glacier cuts a U-shaped valley by ice segregation and abrasion of the surrounding bedrock. According to the standard model, glaciers formed in pre-glacial valleys with a gently sloping valley floor. The work of the glacier then left an overdeepened U-shaped valley that ends abruptly at a valley or trough end. Such valleys are fjords when flooded by the ocean. Thresholds above sea level create freshwater lakes. Glacial melting is accompanied by the rebounding of Earth's crust as the ice load and eroded sediment is removed (also called isostasy or gla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctic Peninsula
The Antarctic Peninsula, known as O'Higgins Land in Chile and Tierra de San Martin in Argentina, and originally as Graham Land in the United Kingdom and the Palmer Peninsula in the United States, is the northernmost part of mainland Antarctica. The Antarctic Peninsula is part of the larger peninsula of West Antarctica, protruding from a line between Cape Adams (Weddell Sea) and a point on the mainland south of the Eklund Islands. Beneath the ice sheet that covers it, the Antarctic Peninsula consists of a string of bedrock islands; these are separated by deep channels whose bottoms lie at depths considerably below current sea level. They are joined by a grounded ice sheet. Tierra del Fuego, the southernmost tip of South America, is about away across the Drake Passage. The Antarctic Peninsula is in area and 80% ice-covered. The marine ecosystem around the western continental shelf of the Antarctic Peninsula (WAP) has been subjected to rapid Climate change in Antarctica, clima ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weddell Sea
The Weddell Sea is part of the Southern Ocean and contains the Weddell Gyre. Its land boundaries are defined by the bay formed from the coasts of Coats Land and the Antarctic Peninsula. The easternmost point is Cape Norvegia at Princess Martha Coast, Queen Maud Land. To the east of Cape Norvegia is the King Haakon VII Sea. Much of the southern part of the sea is covered by a permanent, massive ice shelf field, the Filchner-Ronne Ice Shelf. The sea is contained within the two overlapping Antarctic territorial claims of Argentine Antarctica, the British Antarctic Territory, and also resides partially within the Antártica Chilena Province, Antarctic Chilean Territory. At its widest the sea is around across, and its area is around . Various ice shelves, including the Filchner-Ronne Ice Shelf, fringe the Weddell sea. Some of the ice shelves on the east side of the Antarctic Peninsula, which formerly covered roughly of the Weddell Sea, had completely disappeared by 2002. The Weddel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jakobshavn Retreat-1851-2006
Ilulissat, also known as Jacobshavn or Jakobshav, is the municipal seat and largest town of the Avannaata municipality in western Greenland, located approximately north of the Arctic Circle. With a population of 4,670 as of 2020, it is the third-largest city in Greenland, after Nuuk and Sisimiut. The city is home to almost as many sled-dogs as people. In direct translation, Ilulissat is the Kalaallisut word for "Icebergs" (). The nearby Ilulissat Icefjord is a UNESCO World Heritage Site, and has made Ilulissat the most popular tourist destination in Greenland. Tourism is now the town's principal industry. The city neighbours the Ilulissat Icefjord, where there are enormous icebergs from the most productive glacier in the northern hemisphere. History The town was established as a trading post by Jacob Severin's company in 1741; it was named in his honorMarquardt, Ole.Change and Continuity in Denmark's Greenland Policy in ''The Oldenburg Monarchy: An Underestimated Empire? ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manhattan
Manhattan ( ) is the most densely populated and geographically smallest of the Boroughs of New York City, five boroughs of New York City. Coextensive with New York County, Manhattan is the County statistics of the United States#Smallest, largest, and average area per state and territory, smallest county by area in the U.S. state of New York (state), New York. Located almost entirely on Manhattan Island near the southern tip of the state, Manhattan constitutes the center of the Northeast megalopolis and the urban core of the New York metropolitan area. Manhattan serves as New York City's Economy of New York City, economic and Government of New York City, administrative center and has been described as the cultural, financial, Media in New York City, media, and show business, entertainment capital of the world. Present-day Manhattan was originally part of Lenape territory. European settlement began with the establishment of a trading post by Dutch colonization of the Americas, D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ellesmere Island
Ellesmere Island (; ) is Canada's northernmost and List of Canadian islands by area, third largest island, and the List of islands by area, tenth largest in the world. It comprises an area of , slightly smaller than Great Britain, and the total length of the island is . Lying within the Arctic Archipelago, Ellesmere Island is considered part of the Queen Elizabeth Islands. Cape Columbia at is the most northerly point of land in Canada and one of the most northern points of land on the planet (the most northerly point of land on Earth is the nearby Kaffeklubben Island of Greenland). The Arctic Cordillera mountain system covers much of Ellesmere Island, making it the most mountainous in the Arctic Archipelago. More than one-fifth of the island is protected as Quttinirpaaq National Park. In 2021, the population of Ellesmere Island was recorded at 144. There are three settlements: Alert, Nunavut, Alert, Eureka, Nunavut, Eureka, and Grise Fiord. Ellesmere Island is administered as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tensile Stress
In continuum mechanics, stress is a physical quantity that describes forces present during deformation. For example, an object being pulled apart, such as a stretched elastic band, is subject to ''tensile'' stress and may undergo elongation. An object being pushed together, such as a crumpled sponge, is subject to ''compressive'' stress and may undergo shortening. The greater the force and the smaller the cross-sectional area of the body on which it acts, the greater the stress. Stress has dimension of force per area, with SI units of newtons per square meter (N/m2) or pascal (Pa). Stress expresses the internal forces that neighbouring particles of a continuous material exert on each other, while ''strain'' is the measure of the relative deformation of the material. For example, when a solid vertical bar is supporting an overhead weight, each particle in the bar pushes on the particles immediately below it. When a liquid is in a closed container under pressure, each pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
