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| Titel |
Glacier changes in the Karakoram region mapped by multimission satellite imagery |
| VerfasserIn |
M. Rankl, C. Kienholz, M. Braun |
| 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. 3 ; Nr. 8, no. 3 (2014-05-23), S.977-989 |
| Datensatznummer |
250116160
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| Publikation (Nr.) |
 copernicus.org/tc-8-977-2014.pdf |
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| Zusammenfassung |
| Positive glacier-mass balances in the Karakoram region during the last
decade have fostered stable and advancing glacier termini positions, while
glaciers in the adjacent mountain ranges have been affected by glacier
recession and thinning. In addition to fluctuations induced solely by
climate, the Karakoram is known for a large number of surge-type glaciers.
The present study provides an updated and extended inventory on advancing,
stable, retreating, and surge-type glaciers using Landsat imagery from 1976
to 2012. Out of 1219 glaciers the vast majority showed a stable terminus (969)
during the observation period. Sixty-five glaciers advanced, 93 glaciers
retreated, and 101 surge-type glaciers were identified, of which 10 are new
observations. The dimensional and topographic characteristics of each
glacier class were calculated and analyzed. Ninety percent of nonsurge-type
glaciers are shorter than 10 km, whereas surge-type glaciers are, in
general, longer. We report short response times of glaciers in the Karakoram
and suggest a shift from negative to balanced/positive mass budgets in the
1980s or 1990s. Additionally, we present glacier surface velocities derived
from different SAR (synthetic aperture radar) sensors and different years for a Karakoram-wide
coverage. High-resolution SAR data enables the investigation of small and
relatively fast-flowing glaciers (e.g., up to 1.8 m day−1 during an
active phase of a surge). The combination of multitemporal optical imagery
and SAR-based surface velocities enables an improved, Karakoram-wide glacier
inventory and hence, provides relevant new observational information on the
current state of glaciers in the Karakoram. |
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