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| Titel |
The surface energy balance of a polygonal tundra site in northern Siberia – Part 2: Winter |
| VerfasserIn |
M. Langer, S. Westermann, S. Muster, K. Piel, J. Boike |
| 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. 2 ; Nr. 5, no. 2 (2011-06-14), S.509-524 |
| Datensatznummer |
250002440
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| Publikation (Nr.) |
 copernicus.org/tc-5-509-2011.pdf |
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| Zusammenfassung |
| In this study, we present the winter time surface energy
balance at a polygonal tundra site in northern Siberia based on independent
measurements of the net radiation, the sensible heat flux and the ground heat
flux from two winter seasons. The latent heat flux is inferred from
measurements of the atmospheric turbulence characteristics and a model
approach. The long-wave radiation is found to be the dominant factor in the
surface energy balance. The radiative losses are balanced to about 60 % by
the ground heat flux and almost 40 % by the sensible heat fluxes, whereas
the contribution of the latent heat flux is small. The main controlling
factors of the surface energy budget are the snow cover, the cloudiness and
the soil temperature gradient. Large spatial differences in the surface
energy balance are observed between tundra soils and a small pond. The ground
heat flux released at a freezing pond is by a factor of two higher compared
to the freezing soil, whereas large differences in net radiation between the
pond and soil are only observed at the end of the winter period. Differences
in the surface energy balance between the two winter seasons are found to be
related to differences in snow depth and cloud cover which strongly affect
the temperature evolution and the freeze-up at the investigated pond. |
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