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Outlet Glacier
Glacier morphology, or the form a glacier takes, is influenced by temperature, precipitation, topography, and other factors. The goal of glacial morphology is to gain a better understanding of glaciated landscapes and the way they are shaped. Types of glaciers can range from massive ice sheets, such as the Greenland ice sheet, to small cirque glaciers found perched on mountain tops. Glaciers can be grouped into two main categories: * Ice flow is constrained by the underlying bedrock topography * Ice flow is unrestricted by surrounding topography Unconstrained Glaciers Ice sheets and ice caps Ice sheets and ice caps cover the largest areas of land in comparison to other glaciers, and their ice is unconstrained by the underlying topography. They are the largest glacial ice formations and hold the vast majority of the world's fresh water. Ice sheets Ice sheets are the largest form of glacial formation. They are continent-sized ice masses that span areas over . They are dome ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jostedal Glacier
Jostedal Glacier or is the largest glacier in continental Europe. It is in Vestland county in Western Norway. Jostedalsbreen lies in the municipalities of Luster, Sogndal, Sunnfjord, and Stryn. The highest peak in the area is Lodalskåpa at a height of . History In 1906, work was being done on footpaths that could accommodate tourists. The glacial water is also used in distilling Vikingfjord Geography The Jostedal Glacier has a total area of . The highest point is Høgste Breakulen at above mean sea level. Branches of the glacier reach down into the valleys, for instance Bøyabreen in Fjærland and Nigardsbreen, both at above sea level. The thickest part of the glacier is . Jostedalsbreen has a length of a little more than and it is a part of the Jostedalsbreen National Park, which was established in 1991. The glacier covers over half of the national park. The glacier is maintained by the high snowfall rates in the region, not the cold temperatures. This means the g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Sea Level Rise
The sea level has been rising from the end of the last ice age, which was around 20,000 years ago. Between 1901 and 2018, the average sea level rose by , with an increase of per year since the 1970s. This was faster than the sea level had ever risen over at least the past 3,000 years. The rate accelerated to /yr for the decade 2013–2022. Climate change due to human activities is the main cause. Between 1993 and 2018, melting ice sheets and glaciers accounted for 44% of sea level rise, with another 42% resulting from thermal expansion of water. Sea level rise lags behind changes in the Earth's temperature by decades, and sea level rise will therefore continue to accelerate between now and 2050 in response to warming that has already happened. What happens after that depends on future human greenhouse gas emissions. If there are very deep cuts in emissions, sea level rise would slow between 2050 and 2100. The reported factors of increase in flood hazard potential are often e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iceberg
An iceberg is a piece of fresh water ice more than long that has broken off a glacier or an ice shelf and is floating freely in open water. Smaller chunks of floating glacially derived ice are called "growlers" or "bergy bits". Much of an iceberg is below the water's surface, which led to the expression " tip of the iceberg" to illustrate a small part of a larger unseen issue. Icebergs are considered a serious maritime hazard. Icebergs vary considerably in size and shape. Icebergs that calve from glaciers in Greenland are often irregularly shaped while Antarctic ice shelves often produce large tabular (table top) icebergs. The largest iceberg in recent history, named B-15, was measured at nearly in 2000. The largest iceberg on record was an Antarctic tabular iceberg measuring sighted west of Scott Island, in the South Pacific Ocean, by the USS ''Glacier'' on November 12, 1956. This iceberg was larger than Belgium. Etymology The word ''iceberg'' is a partial loan tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
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 str ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russia
Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders of Russia, land borders with fourteen countries. Russia is the List of European countries by population, most populous country in Europe and the List of countries and dependencies by population, ninth-most populous country in the world. It is a Urbanization by sovereign state, highly urbanised country, with sixteen of its urban areas having more than 1 million inhabitants. Moscow, the List of metropolitan areas in Europe, most populous metropolitan area in Europe, is the capital and List of cities and towns in Russia by population, largest city of Russia, while Saint Petersburg is its second-largest city and Society and culture in Saint Petersburg, cultural centre. Human settlement on the territory of modern Russia dates back to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franz Josef Land
Franz Josef Land () is a Russian archipelago in the Arctic Ocean. It is inhabited only by military personnel. It constitutes the northernmost part of Arkhangelsk Oblast and consists of 192 islands, which cover an area of , stretching from east to west and from north to south. The islands are categorized in three groups (western, central, and eastern) separated by the British Channel and the Austrian Strait. The central group is further divided into a northern and southern section by the Markham Sound. The largest island is Prince George Land, which measures , followed by Wilczek Land, Graham Bell Island and Alexandra Land. Approximately 85% of the archipelago is glaciated, with large unglaciated areas on the largest islands and many of the smallest ones. The islands have a combined coastline of . Compared to other Arctic archipelagos, Franz Josef Land is highly dissected, as a result of it being heavily glaciated, with a very low ratio of total area to coastline of just ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alger Island, Russia
Alger Island (Russian: ''Остров Алджер''; ''Ostrov Aldzher'') is an island in Franz Josef Land, Russia. Lat 80° 22′ N, long 56° 03′ E. Geography The length of Alger Island is and its maximum width . Its highest point is the high summit of the Kupol Vostok Pervyy (Купол Восток Первый) ice dome that covers part of the island. There are wide unglaciated areas on the northern and the southwestern shores. Alger Island is located north of McClintock Island, separated from it by a narrow sound. Off Alger Island's southwestern shores lies Ostrov Matil'dy (Остров Матильды), a very small, barely long, island. History The island was discovered in 1899 by Walter Wellman on board the ''Capella''. He named it after U.S. Secretary of War Russell A. Alger who had donated $250 to Wellman's expedition. The wintering site of the 1901 failed American Baldwin-Ziegler North Pole Expedition was on Alger Island. See also * List of islands o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kupol Vostok Pervyy
JSC Izhevsk Electromechanical Plant or IEMZ Kupol for short () is a Russian military R&D enterprise founded in 1957. It is located in Izhevsk (3 Pesochnaya str).GlobalSecurity.orgIEMZ Kupol/ref> It is part of the state-owned Almaz-Antey holding. According to a Reuters report from September 2024, two sources from a European intelligence agency had told the news agency that IEMZ Kupol had produced more than 2,500 drones of a new type, called Garpiya, from July 2023 to July 2024 which, as per documents seen by Reuters, had Chinese engines and parts. The intelligence sources told Reuters that the drones had been used by Russia during its invasion of Ukraine against military and civilian targets. The company has been sanctioned by the US since December 2023. On 17 November 2024 social media and Ukraine's Center for Countering Disinformation claimed that the plant had been struck by a Ukrainian A-22 UCAV. Military products * Osa-AKM SAM * Saman-M1 target-launching complex * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacier Ice Accumulation
Glacier ice accumulation occurs through accumulation of snow and other frozen precipitation, as well as through other means including rime ice (freezing of water vapor on the glacier surface), avalanching from hanging glaciers on cliffs and mountainsides above, and re-freezing of glacier meltwater as superimposed ice. Accumulation is one element in the glacier mass balance formula, with ablation counteracting. With successive years in which accumulation exceeds ablation, then a glacier will experience positive mass balance, and its terminus will advance. Accumulation zones Glaciologists subdivide glaciers into glacier accumulation zones, based on the melting and refreezing occurring. These zones include the dry snow zone, in which the ice entirely retains subfreezing temperatures and no melting occurs. Dry snow zones only occur within the interior regions of the Greenland and Antarctica ice sheets. Below the dry snow zone is the percolation In physics, chemistry ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
