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| Titel |
Repeat optical satellite images reveal widespread and long term decrease in land-terminating glacier speeds |
| VerfasserIn |
T. Heid, A. Kääb |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2012-04-10), S.467-478 |
| Datensatznummer |
250003492
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| Publikation (Nr.) |
 copernicus.org/tc-6-467-2012.pdf |
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| Zusammenfassung |
| By matching of repeat optical satellite images it is now possible to investigate glacier
dynamics within large regions of the world and also between
regions to improve knowledge about glacier dynamics in space
and time. In this study we investigate whether the negative
glacier mass balance seen over large parts of the world has
caused the glaciers to change their speeds. The studied
regions are Pamir, Caucasus, Penny Ice Cap, Alaska Range and
Patagonia. In addition we derive speed changes for Karakoram,
a region assumed to have positive mass balance and that
contains many surge-type glaciers. We find that the mapped
glaciers in the five regions with negative mass balance have over the last decades decreased their velocity at an average rate per decade of:
43 % in the Pamir, 8 % in the Caucasus, 25 % on Penny Ice Cap,
11 % in the Alaska Range and 20 % in Patagonia. Glaciers in Karakoram have
generally increased their speeds, but surging glaciers and
glaciers with flow instabilities are most prominent in this
area. Therefore the calculated average speed change is not representative for this area. |
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