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| Titel |
Evaluation of Penman-Monteith model applied to a maize field in the arid area of northwest China |
| VerfasserIn |
W.-Z. Zhao, X.-B. Ji, E.-S. Kang, Z.-H. Zhang, B.-W. Jin |
| 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 ; 14, no. 7 ; Nr. 14, no. 7 (2010-07-29), S.1353-1364 |
| Datensatznummer |
250012375
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| Publikation (Nr.) |
 copernicus.org/hess-14-1353-2010.pdf |
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| Zusammenfassung |
| The Penman-Monteith (P-M) model has been applied to estimate
evapotranspiration in terrestrial ecosystem throughout the world. As shown
in many studies, bulk canopy resistance is an especially important factor in
the application of the P-M model. In this study, the authors used the
Noilhan and Planton (N-P) approach and the Jacobs and De Bruin (J-D)
approach to express the bulk canopy resistance. The P-M model was applied to
a maize field using the two approaches in an arid area of northwest China
and evaluated on the basis of measured half-hourly values from the eddy
covariance system. The results indicate that the N-P approach slightly
underestimates the bulk canopy resistance, while the J-D approach
overestimates it. Over the entire maize growing season, the N-P approach
yielded a more consistent estimate of bulk canopy resistance than did the
J-D approach. Correspondingly, the P-M model with J-D bulk canopy resistance
slightly underestimated the latent heat flux throughout the maize growing
season, but overestimated the latent heat flux during the dry season as
compared to the N-P approach results. The good fit between the simulated
latent heat flux estimated by the P-M model using the N-P approach and the
data measured at half-hour time steps demonstrates that the application of
this approach is reasonable in relatively homogenous maize fields that are
not drought-stressed. Further research to improve the performance of P-M
model to simulate evapotranspiration in the cropped fields is discussed. |
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