DOI: 10.1016/j.epsl.2018.06.001
Scopus记录号: 2-s2.0-85048457046
论文题名: Exponentially decreasing erosion rates protect the high-elevation crests of the Himalaya
作者: Banerjee A. ; Wani B.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 497 起始页码: 22
结束页码: 28
语种: 英语
英文关键词: debris-covered glaciers
; frost-cracking
; headwall erosion
; Himalayan topography
Scopus关键词: Debris
; Glacial geology
; Debris covered glaciers
; Equilibrium line altitudes
; Erosion rates
; Glacial erosion
; High elevation
; Low temperatures
; Mean annual temperatures
; Mountain height
; Erosion
; cracking (chemistry)
; debris flow
; erosion rate
; glacial debris
; glacial erosion
; topography
; Himalayas
英文摘要: Glacierised mountains erode rapidly due to efficient glacial erosion around the long-term equilibrium line altitude (ELA), as well as by intense frost-cracking action. This ‘glacial buzzsaw’ is hypothesised to limit mountain heights globally to within about 1.5 km of the local ELA. However, we show that the high Himalaya contrasts this picture with a precipitous decline in the erosion rate at its high-elevation crests. We obtain headwall-erosion rates at eight Himalayan debris-covered glaciers from estimates of the corresponding supraglacial debris flux. The data reveal large variation of erosion rates in the range of 0.04–1.0 mm/yr. We establish that this variability is controlled by an exponential decrease in erosion rate with decreasing mean annual temperature of the headwall due to a decline in frost-cracking intensity at low temperatures. The implied order of magnitude decline of erosion rate at the high altitude of the Himalaya, apart from the pattern and magnitude of uplift, may be crucial for generating relief, and for protecting the spectacularly high crests from the action of ‘glacial buzzsaw’. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109773
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Earth and Climate Science, IISER, Pune, India
Recommended Citation:
Banerjee A.,Wani B.A.. Exponentially decreasing erosion rates protect the high-elevation crests of the Himalaya[J]. Earth and Planetary Science Letters,2018-01-01,497