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| Titel |
Dual versus single source models for estimating surface temperature of African savannah |
| VerfasserIn |
C. Huntingford, A. Verhoef, J. Stewart |
| 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 ; 4, no. 1 ; Nr. 4, no. 1, S.185-191 |
| Datensatznummer |
250001528
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| Publikation (Nr.) |
 copernicus.org/hess-4-185-2000.pdf |
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| Zusammenfassung |
Predictions of average surface temperature of a sparsely
vegetated West-African savannah by both single and dual source models of surface
energy partitioning are compared. Within the single source model, the ``excess
resistance" to heat transfer away from the canopy (compared to momentum
absorption) is characterised by parameter kB-1, where k
is the von Kármán constant and B is the Stanton number. Two values of this
parameter are used; first kB-1 = 2 (a value often used within
surface energy balance models but primarily applicable to permeable vegetation
types) and then 12.4 (a value applicable to the savannah in question, which
consists more of bluff roughness elements). As expected, the latter
parameterisation generates better predictions of surface temperature.
To make accurate predictions of surface temperature using a dual source model,
then that model’s in-canopy aerodynamic resistance must be increased.
Information on this increase is found through direct model intercomparison with
the single source model parameterised with kB-1 = 12.4.
Keywords: Penman-Monteith equation; Surface temperature; Canopy resistance;
Savannah; Dual-Source model |
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