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| Titel |
Global land-surface evaporation estimated from satellite-based observations |
| VerfasserIn |
D. G. Miralles, T. R. H. Holmes, R. A. M. Jeu, J. H. Gash, A. G. C. A. Meesters, A. J. Dolman |
| 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 ; 15, no. 2 ; Nr. 15, no. 2 (2011-02-03), S.453-469 |
| Datensatznummer |
250012638
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| Publikation (Nr.) |
 copernicus.org/hess-15-453-2011.pdf |
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| Zusammenfassung |
| This paper outlines a new strategy to derive evaporation from satellite
observations. The approach uses a variety of satellite-sensor products to
estimate daily evaporation at a global scale and 0.25 degree spatial
resolution. Central to this methodology is the use of the Priestley and Taylor
(PT) evaporation model. The minimalistic PT equation combines a small number
of inputs, the majority of which can be detected from space. This reduces the number
of variables that need to be modelled. Key distinguishing
features of the approach are the use of microwave-derived soil moisture, land surface
temperature and vegetation density, as well as the detailed
estimation of rainfall interception loss. The modelled evaporation is validated
against one year of eddy covariance measurements from 43 stations. The
estimated annual totals correlate well with the stations' annual cumulative
evaporation (R=0.80, N=43) and present a low average bias (−5%). The
validation of the daily time series at each individual station shows good
model performance in all vegetation types and climate conditions with an
average correlation coefficient of R=0.83, still lower than the
R=0.90 found in the validation of the monthly time series. The
first global map of annual evaporation developed through this methodology is
also presented. |
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