气候变化领域集成服务门户(CCPortal): Southwest-facing slopes control the formation of debris-covered glaciers in the Bhutan Himalaya

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DOI	10.5194/tc-7-1303-2013
	Southwest-facing slopes control the formation of debris-covered glaciers in the Bhutan Himalaya
	Nagai H.; Fujita K.; Nuimura T.; Sakai A.
发表日期	2013
ISSN	19940416
卷号	7 期号:4
英文摘要	To understand the formation conditions of debris-covered glaciers, we examined the dimension and shape of debris-covered areas and potential debris-supply (PDS) slopes of 213 glaciers in the Bhutan Himalaya. This was undertaken using satellite images with 2.5 m spatial resolution for manual delineation of debris-covered areas and PDS slopes. The most significant correlation exists between surface area of southwest-facing PDS slopes and debris-covered area. This result suggests that the southwest-facing PDS slopes supply the largest quantity of debris mantle. The shape of debris-covered areas is also an important variable, quantitatively defined using a geometric index. Elongate or stripe-like debris-covered areas on north-flowing glaciers are common throughout the Bhutan Himalaya. In contrast, south-flowing glaciers have large ablation zones, entirely covered by debris. Our findings suggest that this difference is caused by effective diurnal freeze-thaw cycles rather than seasonal freeze-thaw cycles, permafrost degradation, or snow avalanches. In terms of geographic setting, local topography also contributes to glacier debris supply and the proportion of debris cover on the studied glaciers is suppressed by the arid Tibetan climate, whereas the north-to-south asymmetric topography of the Bhutan Himalaya has less influence on the proportion of debris cover. © 2013 ESO.
学科领域	ablation; debris flow; freeze-thaw cycle; geometry; glacier; quantitative analysis; satellite imagery; slope; spatial resolution; Bhutan; Himalayas
语种	英语
scopus关键词	ablation; debris flow; freeze-thaw cycle; geometry; glacier; quantitative analysis; satellite imagery; slope; spatial resolution; Bhutan; Himalayas
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/120262
作者单位	Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
推荐引用方式 GB/T 7714	Nagai H.,Fujita K.,Nuimura T.,et al. Southwest-facing slopes control the formation of debris-covered glaciers in the Bhutan Himalaya[J],2013,7(4).
APA	Nagai H.,Fujita K.,Nuimura T.,&Sakai A..(2013).Southwest-facing slopes control the formation of debris-covered glaciers in the Bhutan Himalaya.Cryosphere,7(4).
MLA	Nagai H.,et al."Southwest-facing slopes control the formation of debris-covered glaciers in the Bhutan Himalaya".Cryosphere 7.4(2013).