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2014 | OriginalPaper | Buchkapitel

2. Snow, Ice and Verticality in the Karakoram

verfasst von : Kenneth Hewitt

Erschienen in: Glaciers of the Karakoram Himalaya

Verlag: Springer Netherlands

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Abstract

The distribution of perennial snow and ice in the Karakoram Himalaya is examined and its area–altitude relations. The presence and extent of snow and ice are shown to depend upon, and be positively correlated with, interfluve heights. The elevations and extent of the highest altitude terrain are of decisive significance. The size, length and lowest reach of glaciers increase as elevation increases up to the highest watersheds. In the Central Karakoram, the ‘glaciation level’, or minimum elevation needed to generate a glacier, is found at about 5,250 m on north-facing slopes and 5,500 m on south-facing slopes. At the western margins, the averages are 4,600 m and 5,200 m, respectively. They rise eastwards by about 1,200 m and 900 m to the highest glaciation levels found in the eastern margins of the Karakoram. A main set of the 42 largest valley glaciers is introduced, with basin areas exceeding 130 km2 and ice streams over 16 km in length. These have exceptional elevation ranges, five spanning more than 5,000 m and 34 more than 3,000 m. Their long profiles exhibit two main features. Most of the vertical descent is accomplished in less than 10 % of ice stream lengths, mainly in icefalls in the upper parts of the basins. However, their longest sections, in the middle and lower reaches, are of relatively gentle gradient. Some 85 % of main ice stream areas lie between 4,000 and 6,000 m, the critical elevation zone in terms of ice cover. This must be balanced against the extreme high elevations of their watersheds and also the exceptionally low termini of many Karakoram glaciers compared to most in the Greater Himalayan Region.

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Fußnoten
1
I estimate that not more than 4,500 km2 of Karakoram perennial snow and ice is in the Yarkand drainage. Yafeng et al. (2010, F143) find the glacier cover on the north, China flank to be 6,262 km2. It seems high, but opinions vary as to how far east the Karakoram extends, and their estimate seems to include the Aghil Range and others adjacent to the Karakoram in the Yarkand Basin.
 
2
Chiantar Glacier, at the head of the Yarkhun–Chitral River, is often placed in the Hindu Raj (von Wissmann 1959) but is treated as a ‘Karakoram’ Glacier here. Its headwaters are in the western extremity of the range. Also in the upper Indus Basin, on the Chitral flank of the Tirich Mir range, are three glaciers of intermediate size: the Tirich, 21 km long; Atrak, 21 km; and Kotgaz, 16 km (ibid, p. 135; Shroder and Bishop 2010, F 211–212). Two Nanga Parbat glaciers, the Rupal (Toshain), at 15.5 km, and Rakhiot, 15 km, are just within the intermediate category. A few glaciers of intermediate size drain to the trans-Himalayan Indus from the Greater Himalayan range to the southwest of the Karakoram.
 
3
Only the Fedchenko Glacier in the Pamir Range, which is 77 km long and 652 km2 in area, exceeds all Karakoram Valley glaciers in length, but seven of the latter have larger basins (Kotlyakov et al. 2010).
 
4
While these comments are often made, it seems the greatest vertical span of a rock face is the nearby south-facing Rupal Wall of Nanga Parbat and the highest measured elevation range in the Annapurna Region of Nepal (Dr. M. Nüsser, personal communication).
 
5
The words elevation, altitude and height are used interchangeably, except where ‘elevation’ refers to the act of lifting.
 
6
This refers to the elevation difference between termini and highest points on the basin watersheds. Few of the main connected glaciers are continuous over the full span (Chap.​ 3).
 
7
The highest point is Mount McKinley (6,193 m).
 
8
The original survey sheet held in the Royal Geographical Society’s map library was used, being much more detailed than the published version (details, Hewitt 1968, I, Table 8.1, and II, Appendix 3).
 
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Metadaten
Titel
Snow, Ice and Verticality in the Karakoram
verfasst von
Kenneth Hewitt
Copyright-Jahr
2014
Verlag
Springer Netherlands
DOI
https://doi.org/10.1007/978-94-007-6311-1_2