globalchange  > 气候减缓与适应
DOI: 10.1029/2017JF004395
Scopus记录号: 2-s2.0-85047635809
论文题名:
Quantifying Debris Thickness of Debris-Covered Glaciers in the Everest Region of Nepal Through Inversion of a Subdebris Melt Model
作者: Rounce D.R.; King O.; McCarthy M.; Shean D.E.; Salerno F.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期:5
起始页码: 1094
结束页码: 1115
语种: 英语
英文关键词: debris properties ; debris thickness ; debris-covered glaciers ; Everest region ; glacier mass balance ; Nepal Himalaya
Scopus关键词: climate forcing ; digital elevation model ; glacier mass balance ; ice thickness ; in situ measurement ; Monte Carlo analysis ; thermal conductivity ; Himalayas ; Nepal
英文摘要: Debris-covered glaciers are ubiquitous in the Himalaya, and supraglacial debris significantly alters how glaciers respond to climate forcing. Estimating debris thickness at the glacier scale, however, remains a challenge. This study inverts a subdebris melt model to estimate debris thickness for three glaciers in the Everest region from digital elevation model difference-derived elevation change. Flux divergences are estimated from ice thickness and surface velocity data. Monte Carlo simulations are used to incorporate the uncertainties associated with debris properties, flux divergence, and elevation change. On Ngozumpa Glacier, surface lowering data from 2010 to 2012 and 2012 to 2014 are used to calibrate and validate the method, respectively. The debris thickness estimates are consistent with existing in situ measurements. The method performs well over both actively flowing and stagnant parts of the glacier and is able to accurately estimate thicker debris (>0.5 m). Uncertainties associated with the thermal conductivity and elevation change contribute the most to uncertainties of the debris thickness estimates. The surface lowering associated with ice cliffs and supraglacial ponds was found to significantly reduce debris thickness, especially for thicker debris. The method is also applied to Khumbu and Imja-Lhotse Shar Glaciers to highlight its potential for regional application. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113912
Appears in Collections:气候减缓与适应

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作者单位: Center for Research in Water Resources, University of Texas at Austin, Austin, TX, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; School of Geography, University of Leeds, Leeds, United Kingdom; British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom; Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom; Polar Science Center, Applied Physics Lab, University of Washington, Seattle, WA, United States; National Research Council, Water Research Institute, Brugherio, Italy

Recommended Citation:
Rounce D.R.,King O.,McCarthy M.,et al. Quantifying Debris Thickness of Debris-Covered Glaciers in the Everest Region of Nepal Through Inversion of a Subdebris Melt Model[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(5)
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