DOI: 10.5194/tc-7-1303-2013
Scopus记录号: 2-s2.0-84883322592
论文题名: Southwest-facing slopes control the formation of debris-covered glaciers in the Bhutan Himalaya
作者: Nagai H ; , Fujita K ; , Nuimura T ; , Sakai A
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 4 起始页码: 1303
结束页码: 1314
语种: 英语
英文关键词: ablation
; debris flow
; freeze-thaw cycle
; geometry
; glacier
; quantitative analysis
; satellite imagery
; slope
; spatial resolution
; Bhutan
; Himalayas
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74951
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
Recommended Citation:
Nagai H,, Fujita K,, Nuimura T,et al. Southwest-facing slopes control the formation of debris-covered glaciers in the Bhutan Himalaya[J]. Cryosphere,2013-01-01,7(4)