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| Titel |
Temperature variability and offset in steep alpine rock and ice faces |
| VerfasserIn |
A. Hasler, S. Gruber, W. Haeberli |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2011-11-10), S.977-988 |
| Datensatznummer |
250002754
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| Publikation (Nr.) |
 copernicus.org/tc-5-977-2011.pdf |
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| Zusammenfassung |
| The thermal condition of high-alpine mountain flanks can be an important
determinant of climate change impact on slope stability and correspondingly
down-slope hazard regimes. In this study we analyze time-series from 17 shallow
temperature-depth profiles at two field sites in steep bedrock and
ice. Extending earlier studies that revealed the topographic variations in
temperatures, we demonstrate considerable differences of annual mean
temperatures for variable surface characteristics and depths within the
measured profiles. This implies that measurements and model related to
compact and near-vertical bedrock temperatures may deviate considerably from
conditions in the majority of bedrock slopes in mountain ranges that are
usually non-vertical and fractured. For radiation-exposed faces mean annual
temperatures at depth are up to 3 °C lower and permafrost is likely to
exist at lower elevations than reflected by estimates based on near-vertical
homogeneous cases. Retention of a thin snow cover and ventilation effects in
open clefts are most likely responsible for this cooling. The measurements
presented or similar data could be used in the future to support the
development and testing of models related to the thermal effect of
snow-cover and fractures in steep bedrock. |
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