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| Titel |
Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan |
| VerfasserIn |
M. Juen, C. Mayer, A. Lambrecht, H. Han, S. Liu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 2 ; Nr. 8, no. 2 (2014-03-07), S.377-386 |
| Datensatznummer |
250116074
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| Publikation (Nr.) |
 copernicus.org/tc-8-377-2014.pdf |
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| Zusammenfassung |
| 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. |
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