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| Titel |
Aggregation rules for surface parameters in global models |
| VerfasserIn |
W. J. Shuttleworth, Z.-L. Yang, M. A. Arain |
| 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 ; 1, no. 2 ; Nr. 1, no. 2, S.217-226 |
| Datensatznummer |
250000141
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| Publikation (Nr.) |
 copernicus.org/hess-1-217-1997.pdf |
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| Zusammenfassung |
| Aggregation rules are derived for calculating the effective
value of parameters that determine the exchange of momentum and energy between the land
surface and the atmosphere
at the length scales used in General Circulation Models (GCMs). The derivation involves
starting from theories that link parameters relevant at grid scale and patch scale,
and then imposing the limitations necessarily present when models are operated in a
free-standing,
predictive mode. The application of these rules is illustrated by example for the case of
the Biosphere-Atmosphere Transfer Scheme (BATS). Remotely sensed global maps of land
cover classes
at 1 km x 1 km pixel scale for North America, South America, and Africa are used with
these new aggregation rules to calculate area-average values of parameters for the
3° x 3° grid mesh used in the National Center for Atmospheric Research Community
Climate Model. There are significant differences between the parameters calculated using
aggregation rules and the values
selected on the basis of the dominant vegetation cover in each grid, this being the selection
procedure conventionally applied with BATS. |
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