DOI: 10.1002/2015GL063192
论文题名: Limits to future expansion of surface-melt-enhanced ice flow into the interior of western Greenland
作者: Poinar K. ; Joughin I. ; Das S.B. ; Behn M.D. ; Lenaerts J.T.M. ; Van Den Broeke M.R.
刊名: Geophysical Research Letters
ISSN: 0094-8849
EISSN: 1944-8580
出版年: 2015
卷: 42, 期: 6 起始页码: 1800
结束页码: 1807
语种: 英语
英文关键词: moulins
Scopus关键词: Glaciers
; Ice
; Lakes
; Greenland Ice Sheet
; Ice sheet models
; Low strain rates
; moulins
; Surface meltwater
; Surface strains
; Surface streams
; Warming climate
; Strain rate
; flow pattern
; glacial lake
; ice flow
; meltwater
; surface water
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Moulins are important conduits for surface meltwater to reach the bed of the Greenland Ice Sheet. It has been proposed that in a warming climate, newly formed moulins associated with the inland migration of supraglacial lakes could introduce surface melt to new regions of the bed, introducing or enhancing sliding there. By examining surface strain rates, we found that the upper limit to where crevasses, and therefore moulins, are likely to form is ∼1600m. This is also roughly the elevation above which lakes do not drain completely. Thus, meltwater above this elevation will largely flow tens of kilometers through surface streams into existing moulins downstream. Furthermore, results from a thermal ice sheet model indicate that the ∼1600m crevassing limit is well below the wet-frozen basal transition (∼2000m). Together, these data sets suggest that new supraglacial lakes will have a limited effect on the inland expansion of melt-induced seasonal acceleration. Key Points Greenland Ice Sheet meltwater volumes are increasing notably at high elevations Low strain rates limit the likelihood of moulin formation at high elevations High-elevation meltwater will reach an already wet bed at lower elevations ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927740404&doi=10.1002%2f2015GL063192&partnerID=40&md5=53c781104686aec2e421069a04ff37a4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8465
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA, United States
Recommended Citation:
Poinar K.,Joughin I.,Das S.B.,et al. Limits to future expansion of surface-melt-enhanced ice flow into the interior of western Greenland[J]. Geophysical Research Letters,2015-01-01,42(6).