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Glacial Lake
A glacial lake is a body of water with origins from glacier activity. They are formed when a glacier erodes the land and then melts, filling the depression created by the glacier. Formation Near the end of the last glacial period, roughly 10,000 years ago, glaciers began to retreat. A retreating glacier often left behind large deposits of ice in hollows between drumlins or hills. As the ice age ended, these melted to create lakes. These lakes are often surrounded by drumlins, along with other evidence of the glacier such as moraines, eskers and erosional features such as glacial striations, striations and chatter marks. These lakes are clearly visible in aerial photos of landforms in regions that were glaciated during the last ice age. The formation and characteristics of glacial lakes vary between location and can be classified into glacial erosion lake, ice-blocked lake, moraine-dammed lake, other glacial lake, supraglacial lake, and subglacial lake. Glacial lakes and chan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacial Lake Outburst Flood
A glacial lake outburst flood (GLOF) is a type of outburst flood caused by the failure of a dam containing a glacial lake. An event similar to a GLOF, where a body of water contained by a glacier melts or overflows the glacier, is called a jökulhlaup. The dam can consist of glacier ice or a terminal moraine. Failure can happen due to erosion, a buildup of water pressure, an avalanche of rock or heavy snow, an earthquake or cryoseism, volcanic eruptions under the ice, or massive displacement of water in a glacial lake when a large portion of an adjacent glacier collapses into it. Increasing glacial melting because of climate change, alongside other environmental effects of climate change (i.e. permafrost melting) mean that regions with glaciers are likely to see increased flooding risks from GLOFs. This is especially true in the Himalayas where geologies are more active. A 2023 study found 15 million people at risk from this hazard, mostly in China, India, Nepal, Pakistan, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
English Lake District
The Lake District, also known as ''the Lakes'' or ''Lakeland'', is a mountainous region and national park in Cumbria, North West England. It is famous for its landscape, including its lakes, coast, and mountains, and for its literary associations with Beatrix Potter, John Ruskin, and the Lake Poets. The Lakeland fells, or mountains, include England's highest: Scafell Pike (), Helvellyn () and Skiddaw (). The region also contains sixteen major lakes. They include Windermere, which with a length of and an area of is the longest and largest lake in England, and Wast Water, which at is the deepest lake in England. The Lake District National Park was established in 1951, and covers an area of , the bulk of the region. It was designated a UNESCO World Heritage Site in 2017. National Park The Lake District National Park includes all of the central Lake District, though the town of Kendal, some coastal areas and the Cartmel and Furness peninsulas are outside the park boundary. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perito Moreno Glacier
The Perito Moreno (), Francisco Gormaz or Bismarck Glacier is a glacier located in Los Glaciares National Park in southwest Santa Cruz Province, Argentina, and originated in the Magallanes Region in Chile, being also part of the Bernardo O'Higgins National Park. It is one of the most important tourist attractions in the Argentine Patagonia. The ice formation, in length, is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes system shared with Chile which has a small part of the origins of the glacier. This ice field is the world's third largest reserve of fresh water. The Perito Moreno Glacier, located from El Calafate, was named after the explorer Francisco Moreno, a pioneer who studied the region in the 19th century and played a major role in defending the Argentinian thesis in the 1902 Arbitral award of the Andes between Argentina and Chile. Status Since 2020 the glacier has been retreating on its northern front, possibly due to clim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argentino Lake
Lago Argentino is a lake in the Patagonian province of Santa Cruz, Argentina, at . It is the largest freshwater lake in Argentina, with a surface area of and a maximum width of . The lake's waters have an average depth of , with a maximum depth of . The deepest point of the lake is situated in the end of its narrow north-northwestern arm, in front of the retreating Upsala Glacier. This depth was discovered during a survey in 2001. The south-southwestern arm ends in front of the Perito Moreno Glacier. The glaciers debouche into the lake at these sites, making "trenches" in the bedrock. The lake reaches an astonishing below mean sea level. Lago Argentino lies within Los Glaciares National Park in a landscape accented by numerous glaciers, and the lakes of the area are fed by the glacial meltwater of several rivers. For example, the waters of Lake Viedma are fed by the La Leona River, and many other smaller mountain streams. Lago Argentino's drainage basin amounts to more tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic Skua
The parasitic jaeger (North America) or Arctic skua (Europe) (''Stercorarius parasiticus''), is a seabird in the skua family Stercorariidae. It is a migratory species breeding in Northern Scandinavia, Scotland, Iceland, Greenland, Northern Canada, Alaska, and Siberia and winters across the southern hemisphere. Kleptoparasitism is a major source of food for this species during migration and winter, and is where the name is derived from. Taxonomy The parasitic jaeger was formally described in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his ''Systema Naturae'' under the binomial name ''Larus parasiticus''. Linnaeus specified the type locality as "within the Tropic of Cancer of Europe, America and Asia" but this is now restricted to the Swedish coastline. The parasitic jaeger is now placed with the six other skuas in the genus '' Stercorarius'' that was introduced in 1760 by the French zoologist Mathurin Jacques Brisson. The species is considered to be mono ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic Tern
The Arctic tern (''Sterna paradisaea'') is a tern in the family Laridae. This bird has a circumpolar breeding distribution covering the Arctic and sub-Arctic regions of Europe (as far south as Brittany), Asia, and North America (as far south as Massachusetts). The species is strongly migratory, seeing two summers each year as it migrates along a convoluted route from its northern breeding grounds to the Antarctic coast for the southern summer and back again about six months later. Recent studies have shown average annual round-trip lengths of about for birds nesting in Iceland and Greenland and about for birds nesting in the Netherlands. These are by far the longest migrations known in the animal kingdom. The Arctic tern nests once every one to three years (depending on its mating cycle). Arctic terns are medium-sized birds. They have a length of and a wingspan of . They are mainly grey and white plumaged, with a red/orange beak and feet, white forehead, a black nape and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jökulsárlón
Jökulsárlón (; translates to "glacial river lagoon") is a large glacial lake in southern part of Vatnajökull National Park, Iceland. Situated at the head of the Breiðamerkurjökull glacier, it developed into a lake after the glacier started receding in the late 19th century. The lake has grown since then at varying rates because of melting of the glaciers. The glacial front is now about away from the ocean's edge and the lake covers an area of about . In 2009 it was reported to be the deepest lake in Iceland, at over , as Retreat of glaciers since 1850, glacial retreat extended its boundaries. The size of the lake has increased fourfold since the 1970s. The lake can be seen from Route 1 (Iceland), Route 1 between Höfn and Skaftafell. It appears as "a ghostly procession of luminous blue icebergs". Jökulsárlón has been a setting for four Hollywood (film industry), Hollywood movies: ''A View to a Kill'', ''Die Another Day'', ''Lara Croft: Tomb Raider'', and ''Batman Begins' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Seal At The Glacial Lagoon
A, or a, is the first letter and the first vowel letter of the Latin alphabet, used in the modern English alphabet, and others worldwide. Its name in English is '' a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version is often written in one of two forms: the double-storey and single-storey . The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English, '' a'' is the indefinite article, with the alternative form ''an''. Name In English, the name of the letter is the ''long A'' sound, pronounced . Its name in most other languages matches the letter's pronunciation in open syllables. History The earliest known ancestor of A is ''aleph''—the first letter of the Phoenician ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocene Climatic Optimum
The Holocene Climate Optimum (HCO) was a warm period in the first half of the Holocene epoch, that occurred in the interval roughly 9,500 to 5,500 years BP, with a thermal maximum around 8000 years BP. It has also been known by many other names, such as Altithermal, Climatic Optimum, Holocene Megathermal, Holocene Optimum, Holocene Thermal Maximum, Holocene global thermal maximum, Hypsithermal, and Mid-Holocene Warm Period. The warm period was followed by a gradual decline, of about 0.1 to 0.3 °C per millennium, until about two centuries ago. However, on a sub-millennial scale, there were regional warm periods superimposed on this decline. * For other temperature fluctuations, see temperature record. * For other past climate fluctuation, see paleoclimatology. * For the pollen zone and Blytt–Sernander period, associated with the climate optimum, see Atlantic (period). Global effects The HCO was approximately 4.9 °C warmer than the Last Glacial Maximum. A study in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock Flour
Rock flour, or glacial flour, consists of fine-grained, silt-sized particles of rock, generated by mechanical grinding of bedrock by glacial erosion or by artificial grinding to a similar size. Because the material is very small, it becomes suspended in meltwater making the water appear cloudy, which is sometimes known as glacial milk. When the sediments enter a river, they turn it grey, light brown, iridescent blue-green, or milky white. If the river flows into a glacial lake, the lake may appear turquoise in colour as a result. When flows of the flour are extensive, a distinct layer of a different colour flows into the lake and begins to dissipate and settle as the flow extends from the increase in water flow from the glacier during snow melts and heavy rain periods. Examples of this phenomenon may be seen at Lake Pukaki and Lake Tekapo in New Zealand, Lake Louise, Moraine Lake, Emerald Lake, and Peyto Lake in Canada, Gjende lake in Norway, and several lakes (among others, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
