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| Titel |
Mosaic versus dual source approaches for modelling the surface energy balance of a semi-arid land |
| VerfasserIn |
G. Boulet, A. Chehbouni, I. Braud, M. Vauclin |
| 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 ; 3, no. 2 ; Nr. 3, no. 2, S.247-258 |
| Datensatznummer |
250000913
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| Publikation (Nr.) |
 copernicus.org/hess-3-247-1999.pdf |
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| Zusammenfassung |
| Two-layer parameterisation of the surface energy budget proves to be
realistic for sparse but homogeneously distributed vegetation. For semi-arid
land surfaces however, sparse vegetation is usually interspersed by large
patches of unshaded bare soil which may interact directly with the atmosphere
with little interference with the vegetation. Therefore such surfaces might not
be realistically represented by a two-layer parameterisation. The objective of
this study is to investigate the issue of representing water and energy transfer
processes in arid and semi-arid regions. Two different surface schemes, namely
the classic two layer (one-compartment) approach and a two adjacent compartment
("mosaic") approach are used. The performance of both schemes is documented
using data sets collected over two sparsely vegetated surfaces in the San Pedro
river basin: homogeneously distributed grassland and heterogeneously distributed
shrubs. In the latter case the mosaic scheme seems to be more realistic given
the quality of the temperature estimates. But no clear statement can be made on
the efficiency of both schemes for the total fluxes. Over each site, we
investigate the possibility of artificially modifying some of the surface
parameters in order to get the surface fluxes simulated by the one-compartment
scheme to reproduce the two-compartment ones. The "cost" associated with this
process in terms of surface temperature estimates is eventually discussed. |
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