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A glacier is a persistent body of dense ice that is constantly moving downhill under its own weight. A glacier forms where 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 is distinct from the much thinner sea ice and lake ice that form on the surface of bodies of water.
A moraine is any accumulation of unconsolidated debris, sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a glacier or ice sheet. It may consist of partly rounded particles ranging in size from boulders down to gravel and sand, in a groundmass of finely-divided clayey material sometimes called glacial flour. Lateral moraines are those formed at the side of the ice flow, and terminal moraines are those formed at the foot, marking the maximum advance of the glacier. Other types of moraine include ground moraines and medial moraines.
The Karakoram is a mountain range in the Kashmir region spanning the border of Pakistan, China, and India, with the northwestern extremity of the range extending to Afghanistan and Tajikistan. Most of the Karakoram mountain range falls under the jurisdiction of Gilgit-Baltistan, which is controlled by Pakistan. Its highest peak, K2, is located in Gilgit-Baltistan, Pakistan. It begins in the Wakhan Corridor (Afghanistan) in the west, encompasses the majority of Gilgit-Baltistan, Pakistan and extends into Ladakh and Aksai Chin.
In glaciology, an ice sheet, also known as a continental glacier, is a mass of glacial ice that covers surrounding terrain and is greater than 50,000 km2 (19,000 sq mi). The only current ice sheets are the Antarctic ice sheet and the Greenland ice sheet. Ice sheets are bigger than ice shelves or alpine glaciers. Masses of ice covering less than 50,000 km2 are termed an ice cap. An ice cap will typically feed a series of glaciers around its periphery.
The Pamir Mountains are a range of mountains between Central Asia and South Asia. They are located at a junction with other notable mountains, namely the Tian Shan, Karakoram, Kunlun, Hindu Kush and the Himalaya mountain ranges. They are among the world's highest mountains.
Scree is a collection of broken rock fragments at the base of a cliff or other steep rocky mass that has accumulated through periodic rockfall. Landforms associated with these materials are often called talus deposits. Talus deposits typically have a concave upwards form, where the maximum inclination corresponds to the angle of repose of the mean debris particle size. The exact definition of scree in the primary literature is somewhat relaxed, and it often overlaps with both talus and colluvium.
Rock glaciers are distinctive geomorphological landforms, consisting either of angular rock debris frozen in interstitial ice, former "true" glaciers overlain by a layer of talus, or something in-between. Rock glaciers are normally found at high latitudes and/or elevations, and may extend outward and downslope from talus cones, glaciers or terminal moraines of glaciers.
Thwaites Glacier is an unusually broad and vast Antarctic glacier located east of Mount Murphy, on the Walgreen Coast of Marie Byrd Land. It was initially sighted by polar researchers in 1940, mapped in 1959–1966 and officially named in 1967, after the late American glaciologist Fredrik T. Thwaites. The glacier flows into Pine Island Bay, part of the Amundsen Sea, at surface speeds which exceed 2 kilometres (1.2 mi) per year near its grounding line. Its fastest-flowing grounded ice is centered between 50 and 100 kilometres east of Mount Murphy. Like many other parts of the cryosphere, it has been adversely affected by climate change, and provides one of the more notable examples of the retreat of glaciers since 1850.
Glacial surges are short-lived events where a glacier can advance substantially, moving at velocities up to 100 times faster than normal. Surging glaciers cluster around a few areas. High concentrations of surging glaciers occur in the Karakoram, Pamir Mountains, Svalbard, the Canadian Arctic islands, Alaska and Iceland, although overall it is estimated that only one percent of all the world's glaciers ever surge. In some glaciers, surges can occur in fairly regular cycles, with 15 to 100 or more surge events per year. In other glaciers, surging remains unpredictable. In some glaciers, however, the period of stagnation and build-up between two surges typically lasts 10 to 200 years and is called the quiescent phase. During this period the velocities of the glacier are significantly lower, and the glaciers can retreat substantially.
The retreat of glaciers since 1850 is well documented and is one of the effects of climate change. The retreat of mountain glaciers provide evidence for the rise in global temperatures since the late 19th century. Examples include mountain glaciers in western North America, Asia, the Alps in central Europe and tropical and subtropical regions of South America and Africa. Since glacial mass is affected by long-term climatic changes, e.g., precipitation, mean temperature, and cloud cover, glacial mass changes are one of the most sensitive indicators of climate change. Retreat of glaciers is also a major reason for sea level rise. Excluding peripheral glaciers of ice sheets, the total cumulated global glacial losses over the 26-year period from 1993 to 2018 were likely 5500 gigatons, or 210 gigatons per yr.
The Siachen Muztagh is a remote subrange of the eastern Karakoram Range. Close to 60% is in area controlled by China, 40% in area controlled by India. Pakistan claims the Indian-controlled portion as part of the Siachen Conflict. India claims the Chinese-controlled portion. India administers its portion as part of the Union Territory of Ladakh. China administers its portion as part of Xinjiang province.
Skyang Kangri, or Staircase Peak, is a high mountain peak of the Baltoro Muztagh, a subrange of the Karakoram range. It lies on the Pakistan–China border, about 7 kilometres (4.3 mi) northeast of K2, the world's second-highest mountain. The name "Staircase Peak" refers to the East Ridge, which resembles a giant staircase with five steps.
Batura Glacier, 57 km (35 mi) long, is one of the largest and longest glaciers outside of the polar regions. It lies in the upper Hunza (Gojal) region of Hunza District, in Gilgit-Baltistan, Pakistan. It is just north of the massifs of Batura, at 7,795 metres (25,574 ft), and Passu, at 7,500 metres (24,600 ft). The glacier flows west to east. The lower portions can be described as a grey sea of rocks and gravelly moraine, bordered by a few summer villages and pastures with herds of sheep, goats, cows and yaks and where roses and juniper trees are common.
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 538,000 km2 (208,000 sq mi), extending approximately 1,100 km (680 mi) into the interior and holds the potential to raise sea level by at least 3.5 m (11 ft). 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 USS Vincennes of the United States Exploring Expedition (1838–42), who assisted Lieutenant Charles Wilkes with correction of the survey data obtained by the expedition.
Radioglaciology is the study of glaciers, ice sheets, ice caps and icy moons using ice penetrating radar. It employs a geophysical method similar to ground-penetrating radar and typically operates at frequencies in the MF, HF, VHF and UHF portions of the radio spectrum. This technique is also commonly referred to as "Ice Penetrating Radar (IPR)" or "Radio Echo Sounding (RES)".
The tidewater glacier cycle is the typically centuries-long behavior of tidewater glaciers that consists of recurring periods of advance alternating with rapid retreat and punctuated by periods of stability. During portions of its cycle, a tidewater glacier is relatively insensitive to climate change.
The Shaksgam River is a left tributary of the Yarkand River. The river is also known as the Kelechin River and Muztagh River. It rises in the Gasherbrum, Urdok, Staghar, Singhi and Kyagar Glaciers in the Karakoram. It then flows in a general northwestern direction parallel to the Karakoram ridge line in the Shaksgam Valley. It receives the waters of the Shimshal Braldu river and the Oprang river from the Pakistan-administered Hunza District before turning east and joining the Yarkand River. The stretch of the river's course between Shimshal Braldu and Oprang is used as the Pakistan–China border.
Lobate debris aprons (LDAs) are geological features on Mars, first seen by the Viking Orbiters, consisting of piles of rock debris below cliffs. These features have a convex topography and a gentle slope from cliffs or escarpments, which suggest flow away from the steep source cliff. In addition, lobate debris aprons can show surface lineations as do rock glaciers on the Earth.
Indira Col West is a mountain pass at 5,988 metres (19,646 ft)) altitude on the Indira Ridge of Siachen Muztagh in Karakoram Range. It is on the border between Indian-controlled Siachen Glacier and the Chinese-controlled Trans-Karakoram Tract, close to the tripoint of India, Pakistan, and China. The India-Pakistan Actual Ground Position Line (AGPL) in the Siachen area ends near the pass. It is possible to ascend the pass from both the north and south sides controlled by China and India respectively.
Storstrommen, is one of the major glaciers in northeastern Greenland. The North-East Greenland Ice Stream (NEGIS) discharges into 3 main marine-terminating outlets: 79N Glacier, Zachariae Isstrøm and Storstrommen - as arranged North to South.
References
- ↑ Thompson, Sarah; Benn, Douglas I.; Mertes, Jordan; Luckman, Adrian (June 2016). "Stagnation and mass loss on a Himalayan debris-covered glacier: processes, patterns and rates". Journal of Glaciology. 62 (233): 467–485. doi:10.1017/jog.2016.37. ISSN 0022-1430.
- ↑ Kneib, M.; Miles, E. S.; Buri, P.; Molnar, P.; McCarthy, M.; Fugger, S.; Pellicciotti, F. (October 2021). "Interannual Dynamics of Ice Cliff Populations on Debris‐Covered Glaciers From Remote Sensing Observations and Stochastic Modeling". Journal of Geophysical Research: Earth Surface. 126 (10). doi:10.1029/2021JF006179. ISSN 2169-9003. PMC 9285626 . PMID 35860443.
- ↑ Bhambri, R.; Hewitt, K.; Kawishwar, P.; Pratap, B. (2017-11-13). "Surge-type and surge-modified glaciers in the Karakoram". Scientific Reports. 7 (1): 15391. doi:10.1038/s41598-017-15473-8. ISSN 2045-2322. PMC 5684366 . PMID 29133812.
- ↑ Glaciers of Asia—Glaciers of Pakistan Satellite Image Atlas of Glaciers of the World By John F. Shroder, Jr., and Michael P. Bishop. Edited by Richard S. Williams, Jr. and Jane G. Ferrigno. U. S. Geological Survey Professional Paper 1386-F-4
- ↑ Raup, Bruce H. "GLIMS: Global Land Ice Measurements from Space". doi:10.7265/n5-rgi-60.
{{cite journal}}: Cite journal requires|journal=(help) - ↑ Evatt, Geoffrey William (November 2017). "The secret life of ice sails". Journal of Glaciology. 63 (242): 1–14.
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