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Denman Glacier
Denman Glacier is a glacier wide, descending north some , which debouches into the Shackleton Ice Shelf east of David Island, Queen Mary Land. It was discovered in November 1912 by the Western Base party of the Australasian Antarctic Expedition under Sir Douglas Mawson. Mawson named the glacier for Lord Denman, Governor-General of Australia in 1911, a patron of the expedition. The canyon under Denman Glacier has been found by ''BedMachine Antarctica'' project (under the leadership of the University of California, Irvine) to be the deepest natural location on land (or at least not under liquid water) worldwide, with the bedrock being below sea level. Calving of Denman Glacier into the Mawson Sea gives rise to the periodically appearing Pobeda Ice Island. Instability and retreat A 2020 study reported Denman Glacier has retreated 5.4±0.3 km over a 20-year-period from 1996 to 2017–2018. The study projects that the glacier has the potential to undergo a rapid, irrev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctica
Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest continent, being about 40% larger than Europe, and has an area of . Most of Antarctica is covered by the Antarctic ice sheet, with an average thickness of . Antarctica is, on average, the coldest, driest, and windiest of the continents, and it has the highest average elevation. It is mainly a polar desert, with annual precipitation of over along the coast and far less inland. About 70% of the world's freshwater reserves are frozen in Antarctica, which, if melted, would raise global sea levels by almost . Antarctica holds the record for the lowest measured temperature on Earth, . The coastal regions can reach temperatures over in summer. Native species of animals include mites, nematodes, penguins, seals and tardigrades. Where ve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pobeda Ice Island
Pobeda Ice Island, original Russian name остров Победы (остров = ''Island'', Победа = ''Victory'', meaning Pobeda Island or Victory Island), is an ''ice island'' in the Mawson Sea. It is located off the coast of Queen Mary Land, East Antarctica. This island, which exists periodically, is formed by the running aground of a tabular iceberg. Periodic formation The ice island is created and vanishes periodically. It is created by the calving of an enormous block of ice from Denman Glacier, located in the eastern part of Shackleton Ice Shelf. The resulting tabular iceberg drifts northwest until it runs aground upon a shoal north of the ice shelf. The iceberg remains locked in this position there for a decade or more, until has remodeled enough to free itself from the shoal. It then drifts into the open ocean, where it breaks into fragments. These iceberg fragments eventually melt as they drift into warmer waters. The floating tongue of the Denman Glacier, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Glaciers In The Antarctic
There are many glaciers in the Antarctic. This set of lists does not include ice sheets, ice caps or ice fields, such as the Antarctic ice sheet, but includes glacial features that are defined by their flow, rather than general bodies of ice. The lists include outlet glaciers, valley glaciers, cirque glaciers, tidewater glaciers and ice streams. Ice streams are a type of glacier and many of them have "glacier" in their name, e.g. Pine Island Glacier. Ice shelves are listed separately in the List of Antarctic ice shelves. For the purposes of these lists, the Antarctic is defined as any latitude further south than 60° (the continental limit according to the Antarctic Treaty System). List by letters * List of glaciers in the Antarctic: A–H * List of glaciers in the Antarctic: I–Z See also * List of Antarctic and subantarctic islands * List of Antarctic ice rises * List of Antarctic ice shelves This is a list of Antarctic ice shelves. Ice shelves ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Antarctic Ice Streams
This is a list of Antarctic ice streams. A complete list of Antarctic ice streams is not available. Names and locations of Antarctic ice features, including those listed below, can be found in the Scientific Committee on Antarctic Research, Gazetteer. Major Antarctic ice drainage systems are given by Rignot and Thomas (2002). These include the ice streams with the greatest flow, which are listed below. References {{authority control * Ice streams ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kola Superdeep Borehole
The Kola Superdeep Borehole (russian: Кольская сверхглубокая скважина, translit=Kol'skaya sverkhglubokaya skvazhina) SG-3 is the result of a scientific drilling project of the Soviet Union in the Pechengsky District, near the Russian border with Norway, on the Kola Peninsula. The project attempted to drill as deep as possible into the Earth's crust. Drilling began on 24 May 1970 using the ''Uralmash-4E'', and later the ''Uralmash-15000'' series drilling rig, and it became the deepest manmade hole in history in 1979. The diameter boreholes were drilled by branching from a central hole. The deepest reached in 1989, the deepest human-made hole on Earth, and remains so as of 2022. In terms of true vertical depth, it remains the deepest borehole in the world. For two decades, it was also the world's longest borehole in terms of measured depth along the well bore until it was surpassed in 2008 by the long Al Shaheen Oil Well in Qatar. Drill ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glaciology
Glaciology (; ) is the scientific study of glaciers, or more generally ice and natural phenomena that involve ice. Glaciology is an interdisciplinary Earth science that integrates geophysics, geology, physical geography, geomorphology, climatology, meteorology, hydrology, biology, and ecology. The impact of glaciers on people includes the fields of human geography and anthropology. The discoveries of water ice on the Moon, Mars, Europa and Pluto add an extraterrestrial component to the field, which is referred to as "astroglaciology". Overview A glacier is an extended mass of ice formed from snow falling and accumulating over a long period of time; glaciers move very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of accumulation, as in continental glaciers. Areas of study within glaciology include glacial history and the reconstruction of past glaciation. A glaciologist is a person who studies glaciers. A glaci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Stream
An ice stream is a region of fast-moving ice within an ice sheet. It is a type of glacier, a body of ice that moves under its own weight. They can move upwards of a year, and can be up to in width, and hundreds of kilometers in length. They tend to be about deep at the thickest, and constitute the majority of the ice that leaves the sheet. In Antarctica, the ice streams account for approximately 90% of the sheet's mass loss per year, and approximately 50% of the mass loss in Greenland. The shear forces cause deformation and recrystallization that drive the movement, this movement then causes topographic lows and valleys to form after all of the material in the ice sheet has been discharged. Sediment also plays an important role in flow velocity, the softer and more easily deformed the sediment present, the easier it is for flow velocity to be higher. Most ice streams contain a layer of water at the bottom, which lubricates flow and acts to increase speed. Mechanics Ice st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chugunov Island
Chugunov Island () is a small ice-covered island, lying at the seaward extremity of the Shackleton Ice Shelf, between the projections of Denman Glacier and Scott Glacier. It was mapped from aerial photos taken by U.S. Navy Operation Highjump, 1946–47. It was rephotographed by the Soviet expedition of 1956 and later named for N.A. Chugunov NA, N.A., Na, nA or n/a may refer to: Chemistry and physics * Sodium, symbol Na, a chemical element * Avogadro constant (''N''A) * Nucleophilic addition, a type of reaction in organic chemistry * Numerical aperture, a number that characterizes a ..., an aerologist who lost his life in the Antarctic in 1958. See also * List of antarctic and sub-antarctic islands References * Islands of Queen Mary Land {{QueenMaryLand-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George V Coast
George V Coast () is that portion of the coast of Antarctica lying between Point Alden, at 148°2′E, and Cape Hudson, at 153°45′E. Portions of this coast were sighted by the US Exploring Expedition in 1840. It was explored by members of the Main Base party of the Australasian Antarctic Expedition (1911–14) under Douglas Mawson who named this feature for King George V of the United Kingdom. The segment of land between these lines of longitude is referred to as George V Land George V Land is a segment of Antarctica part of the land claimed as part of the Australian Antarctic Territory, inland from the George V Coast. As with other segments of Antarctica, it is defined by two lines of longitude, 142°02' E and 153°4 .... Mertz Glacier is located in this area. Further reading * Cantero ÁLP, Marzal MF, Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica)', Zootaxa, 26 Jun 2018, 4441(1):121-136 DOI: 10.11646/zootaxa.4441.1.7 * G. D. Wil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porpoise Bay, Antarctica
Porpoise Bay is an ice-filled embayment about wide indenting the coast of Antarctica between Cape Goodenough and Cape Morse. The United States Exploring Expedition (1838–42) under Charles Wilkes applied the name "Porpoise Bay", after the USEE brig "Porpoise", to a large bay at about 66°S, 130°E. US-ACAN's identification of Porpoise Bay is based on the correlation of Wilkes' chart (1840) with G.D. Blodgett's reconnaissance map (1955) compiled from air photos taken by USN Operation Highjump (1946–47). The name has been applied to the large embayment lying close southwest in keeping with Wilkes' original naming. Porpoise Basin () is an undersea basin, located close to Porpoise Bay. Porpoise Canyon () is an undersea canyon located about from Porpoise Bay; it is one of the largest canyons in the Wilkes Land continental margin A continental margin is the outer edge of continental crust abutting oceanic crust under coastal waters. It is one of the three major zones of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vincennes Bay
Vincennes Bay is a large V-shaped bay, 105 km (65 mi) wide at its entrance between Cape Nutt and Cape Folger in Antarctica, marked by several large, steep glaciers near its head, lying along Knox and Budd Coasts. It was photographed from the air by US Navy Operation Highjump in 1946–47. The bay was entered in January 1948 by US Navy Operation Windmill icebreakers Burton Island and stations in the Windmill Islands in the NE portion of the bay. Named by the US-ACAN for the sloop of war , flagship of the USEE under Wilkes, from which a series of coastal landfalls along Wilkes Land were discovered and plotted during January–February 1840. Wilkes' chart suggests a possible coastal recession corresponding closely with the longitudinal limits for Vincennes Bay, although pack ice conditions prevented close reconnaissance by the USEE of the coast in this immediate area. Vincennes Bay is roughly triangular, 120 km north–south and 150 km east–west at its northe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Totten Glacier
Totten Glacier is a large glacier draining a major portion of the East Antarctic Ice Sheet, through the Budd Coast of Wilkes Land in the Australian Antarctic Territory. The catchment drained by the glacier is estimated at , extending approximately into the interior and holds the potential to raise sea level by at least . Totten drains northeastward from the continental ice but turns northwestward at the coast where it terminates in a prominent tongue close east of Cape Waldron. It was first delineated from aerial photographs taken by USN Operation Highjump (1946–47), and named by Advisory Committee on Antarctic Names (US-ACAN) for George M. Totten, midshipman on of the United States Exploring Expedition (1838–42), who assisted Lieutenant Charles Wilkes with correction of the survey data obtained by the expedition. Totten Ice Shelf is a floating portion of Totten Glacier, laterally bounded by the Aurora Subglacial Basin to the south and Law Dome to the north. The ice shelf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
