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| Titel |
Understanding snow-transport processes shaping the mountain snow-cover |
| VerfasserIn |
R. Mott, M. Schirmer, M. Bavay, T. Grünewald, M. Lehning |
| 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 ; 4, no. 4 ; Nr. 4, no. 4 (2010-12-02), S.545-559 |
| Datensatznummer |
250001903
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| Publikation (Nr.) |
 copernicus.org/tc-4-545-2010.pdf |
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| Zusammenfassung |
| Mountain snow-cover is normally heterogeneously distributed
due to wind and precipitation interacting with the snow cover
on various scales. The aim of this study was to investigate
snow deposition and wind-induced snow-transport processes on
different scales and to analyze some major drift events caused
by north-west storms during two consecutive accumulation
periods. In particular, we distinguish between the individual
processes that cause specific drifts using a physically based
model approach. Very high resolution wind fields (5 m) were
computed with the atmospheric model Advanced
Regional Prediction System (ARPS) and used as input for
a model of snow-surface processes (Alpine3D) to calculate
saltation, suspension and preferential deposition of
precipitation. Several flow features during north-west storms
were identified with input from a high-density network of
permanent and mobile weather stations and indirect estimations
of wind directions from snow-surface structures, such as snow
dunes and sastrugis. We also used Terrestrial and Airborne
Laser Scanning measurements to investigate snow-deposition
patterns and to validate the model. The model results suggest
that the in-slope deposition patterns, particularly two huge
cross-slope cornice-like drifts, developed only when the
prevailing wind direction was northwesterly and were formed
mainly due to snow redistribution processes (saltation-driven).
In contrast, more homogeneous deposition
patterns on a ridge scale were formed during the same periods
mainly due to preferential deposition of precipitation. The
numerical analysis showed that snow-transport processes were
sensitive to the changing topography due to the smoothing
effect of the snow cover. |
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