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| Titel |
Drifting snow climate of the Greenland ice sheet: a study with a regional climate model |
| VerfasserIn |
J. T. M. Lenaerts, M. R. Broeke, J. H. Angelen, E. Meijgaard, S. J. Déry |
| 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. 4 ; Nr. 6, no. 4 (2012-08-15), S.891-899 |
| Datensatznummer |
250003699
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| Publikation (Nr.) |
 copernicus.org/tc-6-891-2012.pdf |
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| Zusammenfassung |
| This paper presents the drifting snow climate of the Greenland ice sheet, using output from
a high-resolution (∼11 km) regional climate model. Because reliable direct
observations of drifting snow do not exist, we evaluate the modeled near-surface climate instead,
using automatic weather station (AWS) observations from the K-transect and find that RACMO2
realistically simulates near-surface wind speed and relative humidity, two variables that are
important for drifting snow. Integrated over the ice sheet, drifting snow sublimation
(SUds) equals 24 ± 3 Gt yr−1, and is significantly larger than
surface sublimation (SUs, 16 ± 2 Gt yr−1). SUds strongly varies between seasons, and is only
important in winter, when surface sublimation and runoff are small. A rapid transition exists
between the winter season, when snowfall and SUds are important, and the summer
season, when snowmelt is significant, which increases surface snow density and thereby limits
drifting snow processes. Drifting snow erosion (ERds) is only important on
a regional scale. In recent decades, following decreasing wind speed and rising near-surface
temperatures, SUds exhibits a negative trend (0.1 ± 0.1 Gt yr−1),
which is compensated by an increase in SUs of similar magnitude. |
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