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| Titel |
Estimation of surface energy fluxes under complex terrain of Mt. Qomolangma over the Tibetan Plateau |
| VerfasserIn |
X. Chen, Z. Su, Y. Ma, K. Yang, B. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 4 ; Nr. 17, no. 4 (2013-04-29), S.1607-1618 |
| Datensatznummer |
250018860
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| Publikation (Nr.) |
 copernicus.org/hess-17-1607-2013.pdf |
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| Zusammenfassung |
| Surface solar radiation is an important parameter in surface energy balance
models and in estimation of evapotranspiration. This study developed a DEM
based radiation model to estimate instantaneous clear sky solar radiation
for surface energy balance system to obtain accurate energy absorbed by the
mountain surface. Efforts to improve spatial accuracy of satellite based
surface energy budget in mountainous regions were made in this work. Based
on eight scenes of Landsat TM/ETM+ (Thematic Mapper/Enhanced Thematic
Mapper+) data and observations around the Qomolangma region of the Tibetan
Plateau, the topographical enhanced surface energy balance system (TESEBS)
was tested for deriving net radiation, ground heat flux, sensible heat flux
and latent heat flux distributions over the heterogeneous land surface. The
land surface energy fluxes over the study area showed a wide range in
accordance with the surface features and their thermodynamic states. The
model was validated by observations at QOMS/CAS site in the research area
with a reasonable accuracy. The mean bias of net radiation, sensible heat
flux, ground heat flux and latent heat flux is lower than 23.6 W m−2.
The surface solar radiation estimated by the DEM based radiation model
developed by this study has a mean bias as low as −9.6 W m−2. TESEBS
has a
decreased mean bias of about 5.9 W m−2 and 3.4 W m−2 for sensible heat
and latent heat flux, respectively, compared to the Surface Energy Balance System (SEBS). |
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