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| Titel |
Southwest-facing slopes control the formation of debris-covered glaciers in the Bhutan Himalaya |
| VerfasserIn |
H. Nagai, K. Fujita, T. Nuimura, A. Sakai |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2013-08-14), S.1303-1314 |
| Datensatznummer |
250085148
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| Publikation (Nr.) |
 copernicus.org/tc-7-1303-2013.pdf |
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| Zusammenfassung |
| 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. |
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