气候变化领域集成服务门户(CCPortal): Impact of varying debris cover thickness on ablation: A case study for Koxkar Glacier in the Tien Shan

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DOI	10.5194/tc-8-377-2014
	Impact of varying debris cover thickness on ablation: A case study for Koxkar Glacier in the Tien Shan
	Juen M.; Mayer C.; Lambrecht A.; Han H.; Liu S.
发表日期	2014
ISSN	19940416
卷号	8 期号:2
英文摘要	To quantify the ablation processes on a debris covered glacier, a simple distributed ablation model has been developed and applied to a selected glacier. For this purpose, a set of field measurements was carried out to collect empirical data. A morphometric analysis of the glacier surface enables us to capture statistically the areal distribution of topographic features that influence debris thickness and consequently ablation. Remote-sensing techniques, using high-resolution satellite imagery, were used to extrapolate the in situ point measurements to the whole ablation area and to map and classify melt-relevant surface types. As a result, a practically applicable method is presented that allows the estimation of ablation on a debris covered glacier by combining field data and remote-sensing information. The sub-debris ice ablation accounts for about 24% of the entire ice ablation, while the percentage of the moraine covered area accounts for approximately 32% of the entire glacierized area. Although the ice cliffs occupy only 1.7% of the debris covered area, the melt amount accounts for approximately 12% of the total sub-debris ablation and 2.5% of the total ablation respectively. Our study highlights the influence of debris cover on the response of the glacier terminus in a particular climate setting. Due to the fact that melt rates beyond 0.1 m of moraine cover are highly restricted, the shielding effect of the debris cover dominates over the temperature and elevation dependence of the ablation in the bare ice case. © Author(s) 2014.
学科领域	climate modeling; empirical analysis; glacial debris; ice field; mapping; remote sensing; satellite imagery; statistical analysis; Tien Shan
语种	英语
scopus关键词	climate modeling; empirical analysis; glacial debris; ice field; mapping; remote sensing; satellite imagery; statistical analysis; Tien Shan
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/120146
作者单位	Commission for Geodesy and Glaciology, Bavarian Academy of Sciences, Munich, Germany; State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China
推荐引用方式 GB/T 7714	Juen M.,Mayer C.,Lambrecht A.,et al. Impact of varying debris cover thickness on ablation: A case study for Koxkar Glacier in the Tien Shan[J],2014,8(2).
APA	Juen M.,Mayer C.,Lambrecht A.,Han H.,&Liu S..(2014).Impact of varying debris cover thickness on ablation: A case study for Koxkar Glacier in the Tien Shan.Cryosphere,8(2).
MLA	Juen M.,et al."Impact of varying debris cover thickness on ablation: A case study for Koxkar Glacier in the Tien Shan".Cryosphere 8.2(2014).