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| Titel |
The growth of sublimation crystals and surface hoar on the Antarctic plateau |
| VerfasserIn |
J.-C. Gallet, F. Domine, J. Savarino, M. Dumont, E. Brun |
| 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. 4 ; Nr. 8, no. 4 (2014-07-14), S.1205-1215 |
| Datensatznummer |
250116243
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| Publikation (Nr.) |
 copernicus.org/tc-8-1205-2014.pdf |
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| Zusammenfassung |
| On the Antarctic plateau, precipitation quantities are so low that the
surface mass budget is for an important part determined by exchanges of
water vapor between the snow surface and the atmosphere surface. At Dome C
(75° S, 123° E), we have frequently observed the growth
of crystals on the snow surface under calm sunny weather. Here we present
the time variations of specific surface area (SSA) and density of these
crystals. Using the detailed snow model Crocus, we conclude that the
formation of these crystals was very likely due to the nighttime formation
of surface hoar crystals and to the daytime formation of sublimation
crystals. These latter crystals form by processes similar to those involved
in the formation of frost flowers on young sea ice. The formation of these
crystals impacts the albedo, mass and energy budget of the Antarctic
plateau. In particular, the SSA variations of the surface layer can induce
an instantaneous forcing at the snow surface up to −10 W m−2 at noon,
resulting in a surface temperature drop of 0.45 K. This result confirms that
snow SSA is a crucial variable to consider in the energy budget and climate
of snow-covered surfaces. |
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