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| Titel |
The surface energy balance of a polygonal tundra site in northern Siberia – Part 1: Spring to fall |
| 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. 1 ; Nr. 5, no. 1 (2011-03-08), S.151-171 |
| Datensatznummer |
250002278
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| Publikation (Nr.) |
 copernicus.org/tc-5-151-2011.pdf |
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| Zusammenfassung |
| In this article, we present a study on the surface energy
balance of a polygonal tundra landscape in northeast Siberia. The study was
performed during half-year periods from April to September in each of 2007
and 2008. The surface energy balance is obtained from independent
measurements of the net radiation, the turbulent heat fluxes, and the ground
heat flux at several sites. Short-wave radiation is the dominant factor
controlling the magnitude of all the other components of the surface energy
balance during the entire observation period. About 50% of the available net
radiation is consumed by the latent heat flux, while the sensible and the
ground heat flux are each around 20 to 30%. The ground heat flux is mainly
consumed by active layer thawing. About 60% of the energy storage in the
ground is attributed to the phase change of soil water. The remainder is used
for soil warming down to a depth of 15 m. In particular, the controlling
factors for the surface energy partitioning are snow cover, cloud cover, and
the temperature gradient in the soil. The thin snow cover melts within a few
days, during which the equivalent of about 20% of the snow-water evaporates
or sublimates. Surface temperature differences of the heterogeneous landscape
indicate spatial variabilities of sensible and latent heat fluxes, which are
verified by measurements. However, spatial differences in the partitioning
between sensible and latent heat flux are only measured during conditions of
high radiative forcing, which only occur occasionally. |
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