DOI: 10.5194/tc-8-377-2014
Scopus记录号: 2-s2.0-84896803583
论文题名: Impact of varying debris cover thickness on ablation: A case study for Koxkar Glacier in the Tien Shan
作者: Juen M ; , Mayer C ; , Lambrecht A ; , Han H ; , Liu S
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 377
结束页码: 386
语种: 英语
英文关键词: climate modeling
; empirical analysis
; glacial debris
; ice field
; mapping
; remote sensing
; satellite imagery
; statistical analysis
; Tien Shan
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74881
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: 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
Recommended Citation:
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]. Cryosphere,2014-01-01,8(2)