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| Titel |
Evaluating parameterizations of aerodynamic resistance to heat transfer using field measurements |
| VerfasserIn |
Shaomin Liu, L. Lu, D. Mao, L. Jia |
| 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 ; 11, no. 2 ; Nr. 11, no. 2 (2007-01-24), S.769-783 |
| Datensatznummer |
250009215
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| Publikation (Nr.) |
 copernicus.org/hess-11-769-2007.pdf |
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| Zusammenfassung |
| Parameterizations of aerodynamic resistance to heat and water transfer have
a significant impact on the accuracy of models of land – atmosphere
interactions and of estimated surface fluxes using spectro-radiometric data
collected from aircrafts and satellites. We have used measurements from an
eddy correlation system to derive the aerodynamic resistance to heat
transfer over a bare soil surface as well as over a maize canopy. Diurnal
variations of aerodynamic resistance have been analyzed. The results showed
that the diurnal variation of aerodynamic resistance during daytime
(07:00 h–18:00 h) was significant for both the bare soil surface and the
maize canopy although the range of variation was limited. Based on the
measurements made by the eddy correlation system, a comprehensive evaluation
of eight popularly used parameterization schemes of aerodynamic resistance
was carried out. The roughness length for heat transfer is a crucial
parameter in the estimation of aerodynamic resistance to heat transfer and
can neither be taken as a constant nor be neglected. Comparing with the
measurements, the parameterizations by Choudhury et al. (1986), Viney
(1991), Yang et al. (2001) and the modified forms of Verma et al. (1976) and
Mahrt and Ek (1984) by inclusion of roughness length for heat transfer gave
good agreements with the measurements, while the parameterizations by
Hatfield et al. (1983) and Xie (1988) showed larger errors even though the
roughness length for heat transfer has been taken into account. |
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