100-571: The Siachen Glacier is a glacier located in the eastern Karakoram range in the Himalayas at about 35°25′16″N 77°06′34″E / 35.421226°N 77.109540°E / 35.421226; 77.109540 , just northeast of the point NJ9842 where the Line of Control between India and Pakistan ends. At 76 km (47 mi) long, it is the longest glacier in the Karakoram and second-longest in
200-424: A cirque landform (alternatively known as a corrie or as a cwm ) – a typically armchair-shaped geological feature (such as a depression between mountains enclosed by arêtes ) – which collects and compresses through gravity the snow that falls into it. This snow accumulates and the weight of the snow falling above compacts it, forming névé (granular snow). Further crushing of the individual snowflakes and squeezing
300-638: A conference at Geneva and invited Indian and Pakistani mountaineers ( Mandip Singh Soin , Harish Kapadia , Nazir Sabir and Sher Khan). The region was nominated for inclusion in the United Nations ' World Heritage List as a part of the Karakoram range, but this was deferred by the World Heritage Committee . The areas to the east and west of the Siachen region have already been declared national parks:
400-511: A glacier is usually assessed by determining the glacier mass balance or observing terminus behavior. Healthy glaciers have large accumulation zones, more than 60% of their area is snow-covered at the end of the melt season, and they have a terminus with a vigorous flow. Following the Little Ice Age 's end around 1850, glaciers around the Earth have retreated substantially . A slight cooling led to
500-411: A glacier via moulins . Streams within or beneath a glacier flow in englacial or sub-glacial tunnels. These tunnels sometimes reemerge at the glacier's surface. Most of the important processes controlling glacial motion occur in the ice-bed contact—even though it is only a few meters thick. The bed's temperature, roughness and softness define basal shear stress, which in turn defines whether movement of
600-417: A high-altitude research centre where scientists and researchers from both the countries can carry out research activities related to glaciology, geology, atmospheric sciences and other related fields. The Siachen glacier was mentioned in the 2018 Hollywood movie Mission: Impossible – Fallout starring Tom Cruise and Henry Cavill . In the movie's climax, rogue agent Walker (Cavill) plants nuclear bombs at
700-408: A kilometer per year. Eventually, the ice will be surging fast enough that it begins to thin, as accumulation cannot keep up with the transport. This thinning will increase the conductive heat loss, slowing the glacier and causing freezing. This freezing will slow the glacier further, often until it is stationary, whence the cycle can begin again. The flow of water under the glacial surface can have
800-404: A large effect on the motion of the glacier itself. Subglacial lakes contain significant amounts of water, which can move fast: cubic kilometers can be transported between lakes over the course of a couple of years. This motion is thought to occur in two main modes: pipe flow involves liquid water moving through pipe-like conduits, like a sub-glacial river; sheet flow involves motion of water in
900-460: A lower heat conductance, meaning that the basal temperature is also likely to be higher. Bed temperature tends to vary in a cyclic fashion. A cool bed has a high strength, reducing the speed of the glacier. This increases the rate of accumulation, since newly fallen snow is not transported away. Consequently, the glacier thickens, with three consequences: firstly, the bed is better insulated, allowing greater retention of geothermal heat. Secondly,
1000-469: A military operation that gave India control over all of the Siachen Glacier, including its tributaries. Between 1984 and 1999, frequent skirmishes took place between India and Pakistan. Indian troops under Operation Meghdoot pre-empted Pakistan's Operation Ababeel by just one day to occupy most of the dominating heights on Saltoro Ridge to the west of Siachen Glacier. However, more soldiers have died from
1100-526: A permanent military presence in the region at a height of over 6,000 m (20,000 ft). Both India and Pakistan have wished to disengage from the costly military outposts. India launched Operation Meghdoot to occupy Siachen Glacier in 1984. Then, due to the Pakistani incursions during the Kargil War in 1999, India abandoned plans to withdraw from Siachen, wary of further Pakistani incursions if they vacate
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#17330849691071200-526: A territorial claim over the Siachen Glacier and controls the region west of Saltoro Ridge , lying west of the glacier, with Pakistani posts located 1 km below more than 100 Indian posts on the ridge. The Siachen Glacier lies immediately south of the great drainage divide that separates the Eurasian Plate from the Indian subcontinent in the extensively glaciated portion of the Karakoram sometimes called
1300-484: A thin layer. A switch between the two flow conditions may be associated with surging behavior. Indeed, the loss of sub-glacial water supply has been linked with the shut-down of ice movement in the Kamb ice stream. The subglacial motion of water is expressed in the surface topography of ice sheets, which slump down into vacated subglacial lakes. The speed of glacial displacement is partly determined by friction . Friction makes
1400-410: A tremendous impact as the iceberg strikes the water. Tidewater glaciers undergo centuries-long cycles of advance and retreat that are much less affected by climate change than other glaciers. Thermally, a temperate glacier is at a melting point throughout the year, from its surface to its base. The ice of a polar glacier is always below the freezing threshold from the surface to its base, although
1500-743: A written reply in the Lok Sabha that a total of 869 Army personnel have died on the Siachen glacier due to climatic conditions and environmental and other factors from the date that the Army launched Operation Meghdoot in 1984. In February 2016, Indian Defence Minister Manohar Parrikar stated that India will not vacate Siachen, as there is a trust deficit with Pakistan and also said that 915 people have died in Siachen since Operation Meghdoot in 1984. According to official records, only 220 Indian soldiers have been killed by enemy bullets since 1984 in Siachen area. Both India and Pakistan continue to deploy thousands of troops in
1600-456: Is above or at freezing at the interface and is able to slide at this contact. This contrast is thought to a large extent to govern the ability of a glacier to effectively erode its bed , as sliding ice promotes plucking at rock from the surface below. Glaciers which are partly cold-based and partly warm-based are known as polythermal . Glaciers form where the accumulation of snow and ice exceeds ablation . A glacier usually originates from
1700-407: Is affected by factors such as slope, ice thickness, snowfall, longitudinal confinement, basal temperature, meltwater production, and bed hardness. A few glaciers have periods of very rapid advancement called surges . These glaciers exhibit normal movement until suddenly they accelerate, then return to their previous movement state. These surges may be caused by the failure of the underlying bedrock,
1800-411: Is because these peaks are located near or in the hyperarid Atacama Desert . Glaciers erode terrain through two principal processes: plucking and abrasion . As glaciers flow over bedrock, they soften and lift blocks of rock into the ice. This process, called plucking, is caused by subglacial water that penetrates fractures in the bedrock and subsequently freezes and expands. This expansion causes
1900-406: Is by basal sliding, where meltwater forms between the ice and the bed itself. Whether a bed is hard or soft depends on the porosity and pore pressure; higher porosity decreases the sediment strength (thus increases the shear stress τ B ). Porosity may vary through a range of methods. Bed softness may vary in space or time, and changes dramatically from glacier to glacier. An important factor
2000-434: Is called glaciology . Glaciers are important components of the global cryosphere . Glaciers are categorized by their morphology, thermal characteristics, and behavior. Alpine glaciers form on the crests and slopes of mountains. A glacier that fills a valley is called a valley glacier , or alternatively, an alpine glacier or mountain glacier . A large body of glacial ice astride a mountain, mountain range, or volcano
2100-416: Is called rock flour and is made up of rock grains between 0.002 and 0.00625 mm in size. Abrasion leads to steeper valley walls and mountain slopes in alpine settings, which can cause avalanches and rock slides, which add even more material to the glacier. Glacial abrasion is commonly characterized by glacial striations . Glaciers produce these when they contain large boulders that carve long scratches in
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#17330849691072200-528: Is distinct from the much thinner sea ice and lake ice that form on the surface of bodies of water. On Earth, 99% of glacial ice is contained within vast ice sheets (also known as "continental glaciers") in the polar regions , but glaciers may be found in mountain ranges on every continent other than the Australian mainland, including Oceania's high-latitude oceanic island countries such as New Zealand . Between latitudes 35°N and 35°S, glaciers occur only in
2300-628: Is higher, and the mountains above 5,000 m (16,400 ft) usually have permanent snow. Even at high latitudes, glacier formation is not inevitable. Areas of the Arctic , such as Banks Island , and the McMurdo Dry Valleys in Antarctica are considered polar deserts where glaciers cannot form because they receive little snowfall despite the bitter cold. Cold air, unlike warm air, is unable to transport much water vapor. Even during glacial periods of
2400-476: Is more than 1000 cm (35 ft) and temperatures can dip to −50 °C (−58 °F). Including all tributary glaciers, the Siachen Glacier system covers about 700 km (270 sq mi). "Sia" in the Balti language refers to the rose family plant widely dispersed in the region. "Chen" refers to any object found in abundance. Thus the name Siachen refers to a land with an abundance of roses. The naming of
2500-476: Is said to have planned a "Green Siachen, Clean Siachen" campaign to airlift the garbage from the glacier, and to use biodigestors for biodegradable waste in the absence of oxygen and freezing temperatures. Almost forty percent (40%) of the waste left at the glacier is plastic and metal, including toxins such as cobalt, cadmium and chromium that eventually affect the water of the Shyok River (which ultimately enters
2600-897: Is termed an ice cap or ice field . Ice caps have an area less than 50,000 km (19,000 sq mi) by definition. Glacial bodies larger than 50,000 km (19,000 sq mi) are called ice sheets or continental glaciers . Several kilometers deep, they obscure the underlying topography. Only nunataks protrude from their surfaces. The only extant ice sheets are the two that cover most of Antarctica and Greenland. They contain vast quantities of freshwater, enough that if both melted, global sea levels would rise by over 70 m (230 ft). Portions of an ice sheet or cap that extend into water are called ice shelves ; they tend to be thin with limited slopes and reduced velocities. Narrow, fast-moving sections of an ice sheet are called ice streams . In Antarctica, many ice streams drain into large ice shelves . Some drain directly into
2700-413: Is the region where there is a net loss in glacier mass. The upper part of a glacier, where accumulation exceeds ablation, is called the accumulation zone . The equilibrium line separates the ablation zone and the accumulation zone; it is the contour where the amount of new snow gained by accumulation is equal to the amount of ice lost through ablation. In general, the accumulation zone accounts for 60–70% of
2800-402: Is the underlying geology; glacial speeds tend to differ more when they change bedrock than when the gradient changes. Further, bed roughness can also act to slow glacial motion. The roughness of the bed is a measure of how many boulders and obstacles protrude into the overlying ice. Ice flows around these obstacles by melting under the high pressure on their stoss side ; the resultant meltwater
2900-552: Is then forced into the cavity arising in their lee side , where it re-freezes. As well as affecting the sediment stress, fluid pressure (p w ) can affect the friction between the glacier and the bed. High fluid pressure provides a buoyancy force upwards on the glacier, reducing the friction at its base. The fluid pressure is compared to the ice overburden pressure, p i , given by ρgh. Under fast-flowing ice streams, these two pressures will be approximately equal, with an effective pressure (p i – p w ) of 30 kPa; i.e. all of
3000-901: The Andes , the Himalayas , the Rocky Mountains , the Caucasus , Scandinavian Mountains , and the Alps . Snezhnika glacier in Pirin Mountain, Bulgaria with a latitude of 41°46′09″ N is the southernmost glacial mass in Europe. Mainland Australia currently contains no glaciers, although a small glacier on Mount Kosciuszko was present in the last glacial period . In New Guinea, small, rapidly diminishing, glaciers are located on Puncak Jaya . Africa has glaciers on Mount Kilimanjaro in Tanzania, on Mount Kenya , and in
3100-636: The Faroe and Crozet Islands were completely glaciated. The permanent snow cover necessary for glacier formation is affected by factors such as the degree of slope on the land, amount of snowfall and the winds. Glaciers can be found in all latitudes except from 20° to 27° north and south of the equator where the presence of the descending limb of the Hadley circulation lowers precipitation so much that with high insolation snow lines reach above 6,500 m (21,330 ft). Between 19˚N and 19˚S, however, precipitation
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3200-750: The Himalayas , Andes , and a few high mountains in East Africa, Mexico, New Guinea and on Zard-Kuh in Iran. With more than 7,000 known glaciers, Pakistan has more glacial ice than any other country outside the polar regions. Glaciers cover about 10% of Earth's land surface. Continental glaciers cover nearly 13 million km (5 million sq mi) or about 98% of Antarctica 's 13.2 million km (5.1 million sq mi), with an average thickness of ice 2,100 m (7,000 ft). Greenland and Patagonia also have huge expanses of continental glaciers. The volume of glaciers, not including
3300-663: The Karakoram Wildlife Sanctuary in India and the Central Karakoram National Park in Pakistan. Sandia National Laboratories organised conferences where military experts and environmentalists from both India and Pakistan and also from other countries were invited to present joint papers. Kent L. Biringer, a researcher at Cooperative Monitoring Center of Sandia Labs suggested setting up Siachen Science Center ,
3400-509: The Ladakh region and as part of the Gilgit–Baltistan region by Pakistan . Between 1984 and 1987, India assumed military control of the main peaks and passes of the range, with Pakistani forces holding the glacial valleys just to the west. Hence, despite high peaks and dramatic climbing opportunities, they are rarely visited except by military forces due to the ongoing Siachen Conflict . On
3500-551: The Quaternary , Manchuria , lowland Siberia , and central and northern Alaska , though extraordinarily cold, had such light snowfall that glaciers could not form. In addition to the dry, unglaciated polar regions, some mountains and volcanoes in Bolivia, Chile and Argentina are high (4,500 to 6,900 m or 14,800 to 22,600 ft) and cold, but the relative lack of precipitation prevents snow from accumulating into glaciers. This
3600-521: The Rwenzori Mountains . Oceanic islands with glaciers include Iceland, several of the islands off the coast of Norway including Svalbard and Jan Mayen to the far north, New Zealand and the subantarctic islands of Marion , Heard , Grande Terre (Kerguelen) and Bouvet . During glacial periods of the Quaternary, Taiwan , Hawaii on Mauna Kea and Tenerife also had large alpine glaciers, while
3700-629: The Shaksgam ceded by Pakistan to China via the 1963 Sino-Pakistan Agreement but also claimed by India and Aksai Chin held by China since 1962 but also claimed by India. The Shaksgam Tract controlled by China is located north of the Saltoro mountain range from the Apsarasas Kangri Range to 90 km northwest of K2 . The AGPL runs roughly along the Saltoro Mountains from Point NJ9842 on
3800-546: The Shyok River . The Shyok in turn joins the 3000 kilometre-long Indus River which flows through Pakistan. Thus, the glacier is a major source of the Indus and feeds the largest irrigation system in the world. The glacier was uninhabited before 1984, and the presence of thousands of troops since then has introduced pollution and melting to the glacier. To support the troops, glacial ice has been cut and melted with chemicals. Dumping of non- biodegradable waste in large quantities and
3900-590: The Siachen , Baltoro , Biafo and Hispar Glacier , which run from east to west. The primary ridge of the Karakoram Range is located to the northeast of these glaciers. The subranges of the main ridge are generally referred to as "Muztagh," while the mountain groups within the Lesser Karakorams are often designated as individual mountains , ranges or groups . The Saltoro Range is claimed by India as part of
4000-719: The " Third Pole ". The glacier lies between the Saltoro Ridge immediately to the west and the main Karakoram range to the east. The Saltoro Ridge originates in the north from the Sia Kangri peak on the China border in the Karakoram range. The crest of the Saltoro Ridge's altitudes range from 5,450 to 7,720 m (17,880 to 25,330 feet). The major passes on this ridge are, from north to south, Sia La at 5,589 m (18,336 ft), Bilafond La at 5,450 m (17,880 ft), and Gyong La at 5,689 m (18,665 ft). The average winter snowfall
4100-505: The 110-km long AGPL is first authenticated, delineated and then demarcated. The 1949 Karachi agreement only carefully delineated the line of separation to point NJ9842 , after which, the agreement states, the line of separation would continue "thence north to the glaciers". According to the Indian stance, the line of separation should continue roughly northwards along the Saltoro Range to
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4200-448: The 1990s and 2000s. In a study using data from January 1993 through October 2005, more events were detected every year since 2002, and twice as many events were recorded in 2005 as there were in any other year. Ogives or Forbes bands are alternating wave crests and valleys that appear as dark and light bands of ice on glacier surfaces. They are linked to seasonal motion of glaciers; the width of one dark and one light band generally equals
4300-633: The India-Pakistan LoC to near La Yongma Ri , Gyong La , Gyong Kangri , Chumik Kangri , Bilafond La (pass) and nearby Bana Post , Saltoro Kangri , Ghent Kangri , and Sia La to the India–Pakistan–China trijunction northwest of Indira Col West on the Sino-Indian LAC . The peaks and passes under Pakistan's control such as Gayari Camp , Chogolisa , Baltoro Glacier , Conway Saddle , Baltoro Muztagh , and Gasherbrum lie west of
4400-482: The Indian Army should stay in the region for strategic advantages, and because a "lot of blood has been shed" by Indian armed personnel for Siachen. The present ground positions, relatively stable for over a decade, mean that India maintains control over all of the 76 kilometres (47 mi) Siachen Glacier and all of its tributary glaciers, as well as all the main passes and heights of the Saltoro Ridge immediately west of
4500-567: The Indian side, roads go only as far as the military base camp at Dzingrulma ( 35°09′59″N 77°12′58″E / 35.1663°N 77.2162°E / 35.1663; 77.2162 ), 72 km from the head of the glacier. The Indian Army has developed various means to reach the Siachen region, including the Manali - Leh - Khardung La -Siachen route. In 2012, Chief of Army Staff of the Indian Army General Bikram Singh said that
4600-600: The Indus River near Skardu ). The Indus is used for drinking and irrigation. Research is being done by scientists of The Energy and Resources Institute , to find ways to successfully dispose of the garbage generated at the glacier using scientific means. Some scientists of the Defence Research and Development Organisation who went on an expedition to Antarctica are also working to produce a bacterium that can thrive in extreme weather conditions and can be helpful in decomposing
4700-427: The Saltoro Mountains range. The Actual Ground Position Line (AGPL) demarcates the boundary between the areas held by India and Pakistan in this region. In the Siachen area, India controls the high peaks and passes, while Pakistan occupies the lower peaks and valleys to the west. The Saltoro Mountains are part of the Lesser Karakorams and are situated on the southwestern side of the major Karakoram glaciers, including
4800-484: The Siachen Glacier posts. Prime Minister Manmohan Singh became the first Indian Prime Minister to visit the area, during which he called for a peaceful resolution of the problem. After that present Prime Minister Narendra Modi also visited this place. President of Pakistan Asif Ali Zardari also visited an area near the Siachen Glacier called Gayari Sector during 2012 with Pakistan Army Chief Gen. Ashfaq Parvez Kayani. Both of them showed their commitment to resolve
4900-576: The Siachen conflict as early as possible. In the previous year, the President of India , Abdul Kalam became the first head of state to visit the area. Since September 2007, India has opened up limited mountaineering and trekking expeditions to the area. The first group included cadets from Chail Military School , National Defence Academy , National Cadet Corps , Indian Military Academy , Rashtriya Indian Military College and family members of armed forces officers. The expeditions are also meant to show to
5000-422: The accumulation of snow exceeds its ablation over many years, often centuries . It acquires distinguishing features, such as crevasses and seracs , as it slowly flows and deforms under stresses induced by its weight. As it moves, it abrades rock and debris from its substrate to create landforms such as cirques , moraines , or fjords . Although a glacier may flow into a body of water, it forms only on land and
5100-412: The advance of many alpine glaciers between 1950 and 1985, but since 1985 glacier retreat and mass loss has become larger and increasingly ubiquitous. Glaciers move downhill by the force of gravity and the internal deformation of ice. At the molecular level, ice consists of stacked layers of molecules with relatively weak bonds between layers. When the amount of strain (deformation) is proportional to
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#17330849691075200-520: The air from the snow turns it into "glacial ice". This glacial ice will fill the cirque until it "overflows" through a geological weakness or vacancy, such as a gap between two mountains. When the mass of snow and ice reaches sufficient thickness, it begins to move by a combination of surface slope, gravity, and pressure. On steeper slopes, this can occur with as little as 15 m (49 ft) of snow-ice. In temperate glaciers, snow repeatedly freezes and thaws, changing into granular ice called firn . Under
5300-430: The amount of melting at surface of the glacier, the faster the ice will flow. Basal sliding is dominant in temperate or warm-based glaciers. The presence of basal meltwater depends on both bed temperature and other factors. For instance, the melting point of water decreases under pressure, meaning that water melts at a lower temperature under thicker glaciers. This acts as a "double whammy", because thicker glaciers have
5400-713: The annual movement of the glacier. Ogives are formed when ice from an icefall is severely broken up, increasing ablation surface area during summer. This creates a swale and space for snow accumulation in the winter, which in turn creates a ridge. Sometimes ogives consist only of undulations or color bands and are described as wave ogives or band ogives. Glaciers are present on every continent and in approximately fifty countries, excluding those (Australia, South Africa) that have glaciers only on distant subantarctic island territories. Extensive glaciers are found in Antarctica, Argentina, Chile, Canada, Pakistan, Alaska, Greenland and Iceland. Mountain glaciers are widespread, especially in
5500-535: The base of Siachen glacier. The scene however was actually filmed in Preikestolen , Norway because the Indian government denied the movie makers permission to film in Kashmir. Glacier A glacier ( US : / ˈ ɡ l eɪ ʃ ər / ; UK : / ˈ ɡ l æ s i ər , ˈ ɡ l eɪ s i ər / ) is a persistent body of dense ice that is constantly moving downhill under its own weight. A glacier forms where
5600-432: The bedrock has frequent fractures on the surface, glacial erosion rates tend to increase as plucking is the main erosive force on the surface; when the bedrock has wide gaps between sporadic fractures, however, abrasion tends to be the dominant erosive form and glacial erosion rates become slow. Glaciers in lower latitudes tend to be much more erosive than glaciers in higher latitudes, because they have more meltwater reaching
5700-445: The bedrock. By mapping the direction of the striations, researchers can determine the direction of the glacier's movement. Similar to striations are chatter marks , lines of crescent-shape depressions in the rock underlying a glacier. They are formed by abrasion when boulders in the glacier are repeatedly caught and released as they are dragged along the bedrock. The rate of glacier erosion varies. Six factors control erosion rate: When
5800-422: The biodegradable waste naturally. The flora and fauna of the Siachen region are also affected by the huge military presence. The region is home to rare species including snow leopard , brown bear and ibex that are at risk because of the military presence. The glacier's region is the highest battleground on Earth, where Pakistan and India have fought intermittently since April 1984. Both countries maintain
5900-559: The created ice's density. The word glacier is a loanword from French and goes back, via Franco-Provençal , to the Vulgar Latin glaciārium , derived from the Late Latin glacia , and ultimately Latin glaciēs , meaning "ice". The processes and features caused by or related to glaciers are referred to as glacial. The process of glacier establishment, growth and flow is called glaciation . The corresponding area of study
6000-467: The deep profile of fjords , which can reach a kilometer in depth as ice is topographically steered into them. The extension of fjords inland increases the rate of ice sheet thinning since they are the principal conduits for draining ice sheets. It also makes the ice sheets more sensitive to changes in climate and the ocean. Although evidence in favor of glacial flow was known by the early 19th century, other theories of glacial motion were advanced, such as
6100-483: The deformation to become a plastic flow rather than elastic. Then, the glacier will begin to deform under its own weight and flow across the landscape. According to the Glen–Nye flow law , the relationship between stress and strain, and thus the rate of internal flow, can be modeled as follows: where: The lowest velocities are near the base of the glacier and along valley sides where friction acts against flow, causing
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#17330849691076200-418: The essentially correct explanation in the 1840s, although it was several decades before it was fully accepted. The top 50 m (160 ft) of a glacier are rigid because they are under low pressure . This upper section is known as the fracture zone and moves mostly as a single unit over the plastic-flowing lower section. When a glacier moves through irregular terrain, cracks called crevasses develop in
6300-475: The fracture zone. Crevasses form because of differences in glacier velocity. If two rigid sections of a glacier move at different speeds or directions, shear forces cause them to break apart, opening a crevasse. Crevasses are seldom more than 46 m (150 ft) deep but, in some cases, can be at least 300 m (1,000 ft) deep. Beneath this point, the plasticity of the ice prevents the formation of cracks. Intersecting crevasses can create isolated peaks in
6400-457: The glacial base and facilitate sediment production and transport under the same moving speed and amount of ice. Material that becomes incorporated in a glacier is typically carried as far as the zone of ablation before being deposited. Glacial deposits are of two distinct types: Saltoro Ridge The Saltoro Mountains form a subrange within the Karakoram Range and are situated in
6500-714: The glacier itself, or at least its currency, is attributed to Tom Longstaff . Both India and Pakistan claim sovereignty over the entire Siachen region. In June 1958, first Geological Survey of India expedition went to the Siachen glacier. It was the first official Indian survey of Siachen Glacier by Geological Survey of India post-1947 and that was undertaken to commemorate the International Geophysical Year in 1958. The study included snout surveying of five glaciers namely Siachen, Mamostong , Chong Kumdan , Kichik Kumdan and Aktash Glaciers in Ladakh region. 5Q 131 05 084
6600-425: The glacier size has decreased by almost 35 percent. In an eleven-year period, the glacier had receded nearly 800 metres, and in seventeen years about 1700 metres. It is predicted that the glaciers of the Siachen region will be reduced to about one-fifth of their 2011 size by 2035. In the twenty-nine-year period 1929–1958, well before the military occupation, the glacial retreat was recorded to be about 914 metres. One of
6700-453: The glacier to melt, creating a water source that is especially important for plants, animals and human uses when other sources may be scant. However, within high-altitude and Antarctic environments, the seasonal temperature difference is often not sufficient to release meltwater. Since glacial mass is affected by long-term climatic changes, e.g., precipitation , mean temperature , and cloud cover , glacial mass changes are considered among
6800-428: The glacier will be accommodated by motion in the sediments, or if it'll be able to slide. A soft bed, with high porosity and low pore fluid pressure, allows the glacier to move by sediment sliding: the base of the glacier may even remain frozen to the bed, where the underlying sediment slips underneath it like a tube of toothpaste. A hard bed cannot deform in this way; therefore the only way for hard-based glaciers to move
6900-504: The glacier's surface area, more if the glacier calves icebergs. Ice in the accumulation zone is deep enough to exert a downward force that erodes underlying rock. After a glacier melts, it often leaves behind a bowl- or amphitheater-shaped depression that ranges in size from large basins like the Great Lakes to smaller mountain depressions known as cirques . The accumulation zone can be subdivided based on its melt conditions. The health of
7000-440: The glacier, including Sia La , Bilafond La , Gyong La , Yarma La (6,100m), and Chulung La [ ceb ] (5,800m). Pakistan controls the glacial valleys immediately west of the Saltoro Ridge. According to TIME magazine , India gained over 1,000 square miles (3,000 km) in territory because of its 1980s military operations in Siachen. India has categorically stated that India will not pull its army from Siachen until
7100-399: The harsh weather conditions in the region than from combat. Pakistan lost 353 soldiers in various operations recorded between 2003 and 2010 near Siachen, including 140 Pakistanis killed in the 2012 Gayari Sector avalanche . Between January 2012 and July 2015, 33 Indian soldiers died due to adverse weather. In December 2015, Indian Union Minister of State for Defence Rao Inderjit Singh said in
7200-614: The ice at the bottom of the glacier move more slowly than ice at the top. In alpine glaciers, friction is also generated at the valley's sidewalls, which slows the edges relative to the center. Mean glacial speed varies greatly but is typically around 1 m (3 ft) per day. There may be no motion in stagnant areas; for example, in parts of Alaska, trees can establish themselves on surface sediment deposits. In other cases, glaciers can move as fast as 20–30 m (70–100 ft) per day, such as in Greenland's Jakobshavn Isbræ . Glacial speed
7300-420: The ice sheets of Antarctica and Greenland, has been estimated at 170,000 km . Glacial ice is the largest reservoir of fresh water on Earth, holding with ice sheets about 69 percent of the world's freshwater. Many glaciers from temperate , alpine and seasonal polar climates store water as ice during the colder seasons and release it later in the form of meltwater as warmer summer temperatures cause
7400-544: The ice to act as a lever that loosens the rock by lifting it. Thus, sediments of all sizes become part of the glacier's load. If a retreating glacier gains enough debris, it may become a rock glacier , like the Timpanogos Glacier in Utah. Abrasion occurs when the ice and its load of rock fragments slide over bedrock and function as sandpaper, smoothing and polishing the bedrock below. The pulverized rock this process produces
7500-488: The ice, called seracs . Crevasses can form in several different ways. Transverse crevasses are transverse to flow and form where steeper slopes cause a glacier to accelerate. Longitudinal crevasses form semi-parallel to flow where a glacier expands laterally. Marginal crevasses form near the edge of the glacier, caused by the reduction in speed caused by friction of the valley walls. Marginal crevasses are largely transverse to flow. Moving glacier ice can sometimes separate from
7600-411: The idea that meltwater, refreezing inside glaciers, caused the glacier to dilate and extend its length. As it became clear that glaciers behaved to some degree as if the ice were a viscous fluid, it was argued that "regelation", or the melting and refreezing of ice at a temperature lowered by the pressure on the ice inside the glacier, was what allowed the ice to deform and flow. James Forbes came up with
7700-418: The increased pressure can facilitate melting. Most importantly, τ D is increased. These factors will combine to accelerate the glacier. As friction increases with the square of velocity, faster motion will greatly increase frictional heating, with ensuing melting – which causes a positive feedback, increasing ice speed to a faster flow rate still: west Antarctic glaciers are known to reach velocities of up to
7800-423: The infrared OH stretching mode of the water molecule. (Liquid water appears blue for the same reason. The blue of glacier ice is sometimes misattributed to Rayleigh scattering of bubbles in the ice.) A glacier originates at a location called its glacier head and terminates at its glacier foot, snout, or terminus . Glaciers are broken into zones based on surface snowpack and melt conditions. The ablation zone
7900-486: The international audience that Indian troops hold "almost all dominating heights" on the key Saltoro Ridge and to show that Pakistani troops are nowhere near the Siachen Glacier. Ignoring protests from Pakistan, India maintains that it does not need anyone's approval to send trekkers to Siachen, in what it says is essentially its own territory. In addition, the Indian Army 's Army Mountaineering Institute (AMI) functions out of
8000-679: The most deformation. Velocity increases inward toward the center line and upward, as the amount of deformation decreases. The highest flow velocities are found at the surface, representing the sum of the velocities of all the layers below. Because ice can flow faster where it is thicker, the rate of glacier-induced erosion is directly proportional to the thickness of overlying ice. Consequently, pre-glacial low hollows will be deepened and pre-existing topography will be amplified by glacial action, while nunataks , which protrude above ice sheets, barely erode at all – erosion has been estimated as 5 m per 1.2 million years. This explains, for example,
8100-445: The most sensitive indicators of climate change and are a major source of variations in sea level . A large piece of compressed ice, or a glacier, appears blue , as large quantities of water appear blue , because water molecules absorb other colors more efficiently than blue. The other reason for the blue color of glaciers is the lack of air bubbles. Air bubbles, which give a white color to ice, are squeezed out by pressure increasing
8200-556: The natural biological system and protect species whose lives are at risk. Italian ecologist Giuliano Tallone said the ecological life was at serious risk, and proposed setting up a Siachen Peace Park at the conference. After a proposal of a transboundary Peace Park was floated, the International Mountaineering and Climbing Federation (UIAA) and the International Union for Conservation of Nature (IUCN) organised
8300-665: The northern Saltoro Mountains from the southern Saltoro Mountains or "Kailas Mountains" (not to be confused with Tibet 's sacred Mount Kailash ). The actual India-Pakistan boundary is divided into 4 types of borders: disputed Sir Creek (SC) riverine border, mutually agreed India–Pakistan International Border (IB) from north of Sir Creek to north of Dhalan near Jammu , Line of Control (LoC) across disputed Kashmir and Ladakh regions from north of Dhalan in India and west of Chicken's Neck in Pakistan to Point NJ9842 , and Actual Ground Position Line (AGPL) across Siachen from Point NJ9842 to Indira Col West . Siachen lies south of
8400-721: The pooling of meltwater at the base of the glacier — perhaps delivered from a supraglacial lake — or the simple accumulation of mass beyond a critical "tipping point". Temporary rates up to 90 m (300 ft) per day have occurred when increased temperature or overlying pressure caused bottom ice to melt and water to accumulate beneath a glacier. In glaciated areas where the glacier moves faster than one km per year, glacial earthquakes occur. These are large scale earthquakes that have seismic magnitudes as high as 6.1. The number of glacial earthquakes in Greenland peaks every year in July, August, and September and increased rapidly in
8500-410: The pressure of the layers of ice and snow above it, this granular ice fuses into denser firn. Over a period of years, layers of firn undergo further compaction and become glacial ice. Glacier ice is slightly more dense than ice formed from frozen water because glacier ice contains fewer trapped air bubbles. Glacial ice has a distinctive blue tint because it absorbs some red light due to an overtone of
8600-431: The reasons theorized for the recent glacial retreat is chemical blasting, to construct camps and posts . In 2001 India laid oil pipelines (about 250 kilometres long) inside the glacier to supply kerosene and aviation fuel to the outposts from base camps. As of 2007, the temperature rise at Siachen was estimated at 0.2-degree Celsius annually, causing melting, avalanches, and crevasses in the glacier. The waste produced by
8700-410: The region. The idea of declaring the Siachen region a "Peace Park" was presented by environmentalists and peace activists in part to preserve the ecosystem of the region badly affected by the military presence. In September 2003, the governments of India and Pakistan were urged by the participants of the 5th World Parks Congress held at Durban , to establish a peace park in the Siachen region to restore
8800-558: The sea, often with an ice tongue , like Mertz Glacier . Tidewater glaciers are glaciers that terminate in the sea, including most glaciers flowing from Greenland, Antarctica, Baffin , Devon , and Ellesmere Islands in Canada, Southeast Alaska , and the Northern and Southern Patagonian Ice Fields . As the ice reaches the sea, pieces break off or calve, forming icebergs . Most tidewater glaciers calve above sea level, which often results in
8900-715: The southeastern part of the Karakoram. They lie on the southwest side of the Siachen Glacier , which is one of the two longest glaciers in the world outside the polar regions. The name "Saltoro" is also associated with the Saltoro Valley , located west of this range and descending on the Pakistani side of the Saltoro Range, which generally follows the Actual Ground Position Line (AGPL). Saltoro Kangri peak, Saltoro River , and Saltoro Valley are features within
9000-669: The southwest side, the Saltoro Mountains drop steeply to the valleys of the Kondus and Dansam Rivers, which join to form the Saltoro River, a tributary of the Shyok River . This in turn flows into the Indus River . To the northwest, the Kondus Glacier separates the range from the neighboring Masherbrum Mountains , while on the southeast, the Gyong River, Glacier, and Pass ( Gyong La ) separate
9100-409: The stagnant ice above, forming a bergschrund . Bergschrunds resemble crevasses but are singular features at a glacier's margins. Crevasses make travel over glaciers hazardous, especially when they are hidden by fragile snow bridges . Below the equilibrium line, glacial meltwater is concentrated in stream channels. Meltwater can pool in proglacial lakes on top of a glacier or descend into the depths of
9200-423: The stress being applied, ice will act as an elastic solid. Ice needs to be at least 30 m (98 ft) thick to even start flowing, but once its thickness exceeds about 50 m (160 ft) (160 ft), stress on the layer above will exceeds the inter-layer binding strength, and then it'll move faster than the layer below. This means that small amounts of stress can result in a large amount of strain, causing
9300-438: The surface snowpack may experience seasonal melting. A subpolar glacier includes both temperate and polar ice, depending on the depth beneath the surface and position along the length of the glacier. In a similar way, the thermal regime of a glacier is often described by its basal temperature. A cold-based glacier is below freezing at the ice-ground interface and is thus frozen to the underlying substrate. A warm-based glacier
9400-454: The troops stationed there is dumped in the crevasses of the glacier. Mountaineers who visited the area while on climbing expeditions witnessed large amount of garbage, empty ammunition shells , parachutes etc. dumped on the glacier, that neither decomposes nor can be burned because of the extreme climatic conditions. About 1,000 kilograms (1.1 short tons) of waste is produced and dumped in glacial crevasses daily by Indian forces. The Indian army
9500-410: The use of arms and ammunition have considerably affected the ecosystem of the region. Preliminary findings of a survey by Pakistan Meteorological Department in 2007 revealed that the Siachen glacier has been retreating for the past 30 years and is melting at an alarming rate. The study of satellite images of the glacier showed that the glacier is retreating at a rate of about 110 metres a year and that
9600-434: The vicinity of Siachen and attempts to demilitarize the region have been so far unsuccessful. Prior to 1984, neither country had any military forces in this area. Aside from the Indian and Pakistani military presence, the glacier region is unpopulated. The nearest civilian settlement is the village of Warshi , 10 miles downstream from the Indian base camp. The region is also extremely remote, with limited road connectivity. On
9700-417: The weight of the ice is supported by the underlying water, and the glacier is afloat. Glaciers may also move by basal sliding , where the base of the glacier is lubricated by the presence of liquid water, reducing basal shear stress and allowing the glacier to slide over the terrain on which it sits. Meltwater may be produced by pressure-induced melting, friction or geothermal heat . The more variable
9800-471: The west of the Siachen glacier beyond NJ9842; international boundary lines that follow mountain ranges often do so by following the watershed drainage divide such as that of the Saltoro Range. The 1972 Simla Agreement made no change to the 1949 Line of Control in this northernmost sector. The glacier's melting waters are the main source of the Nubra River in the Indian region of Ladakh , which drains into
9900-521: The world's non-polar areas . It falls from an altitude of 5,753 m (18,875 ft) above sea level at its head at Indira Col on the India–China border down to 3,620 m (11,875 ft) at its terminus . The entire Siachen Glacier, with all major passes, has been under the administration of India as part of the union territory of Ladakh , located in the Kashmir region since 1984 . Pakistan maintains
10000-605: Was the number assigned to the Siachen glacier by the expedition. U.S. and Pakistani maps in the 1970s and 1980s consistently showed a dotted line from NJ9842 (the northernmost demarcated point of the India-Pakistan cease-fire line, also known as the Line of Control ) to the Karakoram Pass , which India believed to be a cartographic error and in violation of the Simla Agreement . In 1984, India launched Operation Meghdoot ,
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