气候变化领域集成服务门户(CCPortal): Structure and evolution of the drainage system of a Himalayan debris-covered glacier, and its relationship with patterns of mass loss

CCPortal

DOI	10.5194/tc-11-2247-2017
	Structure and evolution of the drainage system of a Himalayan debris-covered glacier, and its relationship with patterns of mass loss
	Benn D.; Thompson S.; Gulley J.; Mertes J.; Luckman A.; Nicholson L.
发表日期	2017
ISSN	19940416
卷号	11 期号:5
英文摘要	We provide the first synoptic view of the drainage system of a Himalayan debris-covered glacier and its evolution through time, based on speleological exploration and satellite image analysis of Ngozumpa Glacier, Nepal. The drainage system has several linked components: (1) a seasonal subglacial drainage system below the upper ablation zone; (2) supraglacial channels, allowing efficient meltwater transport across parts of the upper ablation zone; (3) sub-marginal channels, allowing long-distance transport of meltwater; (4) perched ponds, which intermittently store meltwater prior to evacuation via the englacial drainage system; (5) englacial cut-And-closure conduits, which may undergo repeated cycles of abandonment and reactivation; and (6) a "base-level" lake system (Spillway Lake) dammed behind the terminal moraine. The distribution and relative importance of these elements has evolved through time, in response to sustained negative mass balance. The area occupied by perched ponds has expanded upglacier at the expense of supraglacial channels, and Spillway Lake has grown as more of the glacier surface ablates to base level. Subsurface processes play a governing role in creating, maintaining, and shutting down exposures of ice at the glacier surface, with a major impact on spatial patterns and rates of surface mass loss. Comparison of our results with observations on other glaciers indicate that englacial drainage systems play a key role in the response of debris-covered glaciers to sustained periods of negative mass balance.
学科领域	ablation; drainage; exploration; glacial debris; glacial hydrology; glacier mass balance; image analysis; meltwater; moraine; satellite imagery; Himalayas; Nepal; Ngozumpa Glacier; Sagarmatha [(ADS) Nepal]
语种	英语
scopus关键词	ablation; drainage; exploration; glacial debris; glacial hydrology; glacier mass balance; image analysis; meltwater; moraine; satellite imagery; Himalayas; Nepal; Ngozumpa Glacier; Sagarmatha [(ADS) Nepal]
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119329
作者单位	School of Geography and Sustainable Development, University of St.Andrews, St.Andrews, United Kingdom; Department of Geography, Swansea University, Swansea, United Kingdom; School of Geosciences, University of South Florida, Tampa, FL, United States; Department of Geological and Mining Engineering and Sciences, Michigan Tech, Houghton, MI, United States; Institute for Atmospheric and Cryospheric Sciences, University of Innsbruck, Innsbruck, Austria
推荐引用方式 GB/T 7714	Benn D.,Thompson S.,Gulley J.,et al. Structure and evolution of the drainage system of a Himalayan debris-covered glacier, and its relationship with patterns of mass loss[J],2017,11(5).
APA	Benn D.,Thompson S.,Gulley J.,Mertes J.,Luckman A.,&Nicholson L..(2017).Structure and evolution of the drainage system of a Himalayan debris-covered glacier, and its relationship with patterns of mass loss.Cryosphere,11(5).
MLA	Benn D.,et al."Structure and evolution of the drainage system of a Himalayan debris-covered glacier, and its relationship with patterns of mass loss".Cryosphere 11.5(2017).