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| Titel |
Estimating surface fluxes over the north Tibetan Plateau area with ASTER imagery |
| VerfasserIn |
Weiqiang Ma, Yaoming Ma, Maoshan Li, Zeyong Hu, Lei Zhong, Zhongbo Su, Hirohiko Ishikawa, Jiemin 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 ; 13, no. 1 ; Nr. 13, no. 1 (2009-01-26), S.57-67 |
| Datensatznummer |
250011726
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| Publikation (Nr.) |
 copernicus.org/hess-13-57-2009.pdf |
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| Zusammenfassung |
| Surface fluxes are important boundary conditions for climatological modeling
and Asian monsoon system. The recent availability of high-resolution,
multi-band imagery from the ASTER (Advanced Space-borne Thermal Emission and
Reflection radiometer) sensor has enabled us to estimate surface fluxes to
bridge the gap between local scale flux measurements using
micrometeorological instruments and regional scale land-atmosphere exchanges
of water and heat fluxes that are fundamental for the understanding of the
water cycle in the Asian monsoon system. A parameterization method based on
ASTER data and field observations has been proposed and tested for deriving
surface albedo, surface temperature, Normalized Difference Vegetation Index
(NDVI), Modified Soil Adjusted Vegetation Index (MSAVI), vegetation coverage, Leaf
Area Index (LAI), net radiation flux, soil heat flux, sensible heat flux and
latent heat flux over heterogeneous land surface in this paper. As a case
study, the methodology was applied to the experimental area of the
Coordinated Enhanced Observing Period (CEOP) Asia-Australia Monsoon Project
(CAMP) on the Tibetan Plateau (CAMP/Tibet), located at the north Tibetan
Plateau. The ASTER data of 24 July 2001, 29 November 2001 and 12 March 2002
was used in this paper for the case of summer, winter and spring. To
validate the proposed methodology, the ground-measured surface variables
(surface albedo and surface temperature) and land surface heat fluxes (net
radiation flux, soil heat flux, sensible heat flux and latent heat flux)
were compared to the ASTER derived values. The results show that the derived
surface variables and land surface heat fluxes in three different months
over the study area are in good accordance with the land surface status.
Also, the estimated land surface variables and land surface heat fluxes are
in good accordance with ground measurements, and all their absolute
percentage difference (APD) is less than 10% in the validation sites. It
is therefore concluded that the proposed methodology is successful for the
retrieval of land surface variables and land surface heat fluxes using the
ASTER data and filed observation over the study area. |
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