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| Titel |
Meso-scale effects of tropical deforestation in Amazonia: preparatory LBA modelling studies |
| VerfasserIn |
A. J. Dolman, M. A. Silva Dias, J.-C. Calvet, M. Ashby, A. S. Tahara, C. Delire, P. Kabat, G. A. Fisch, C. A. Nobre |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 17, no. 8 ; Nr. 17, no. 8, S.1095-1110 |
| Datensatznummer |
250013802
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| Publikation (Nr.) |
 copernicus.org/angeo-17-1095-1999.pdf |
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| Zusammenfassung |
As part of the preparation for the
Large-Scale Biosphere Atmosphere Experiment in Amazonia, a meso-scale modelling
study was executed to highlight deficiencies in the current understanding of
land surface atmosphere interaction at local to sub-continental scales in the
dry season. Meso-scale models were run in 1-D and 3-D mode for the area of
Rondonia State, Brazil. The important conclusions are that without calibration
it is difficult to model the energy partitioning of pasture; modelling that of
forest is easier due to the absence of a strong moisture deficit signal. The
simulation of the boundary layer above forest is good, above deforested areas
(pasture) poor. The models' underestimate of the temperature of the boundary
layer is likely to be caused by the neglect of the radiative effects of aerosols
caused by biomass burning, but other factors such as lack of sufficient
entrainment in the model at the mixed layer top may also contribute. The Andes
generate patterns of subsidence and gravity waves, the effects of which are felt
far into the Rondonian area The results show that the picture presented by GCM
modelling studies may need to be balanced by an increased understanding of what
happens at the meso-scale. The results are used to identify key measurements for
the LBA atmospheric meso-scale campaign needed to improve the model simulations.
Similar modelling studies are proposed for the wet season in Rondonia, when
convection plays a major role.
Key words. Atmospheric composition and structure
(aerosols and particles; biosphere-atmosphere interactions) · Meterology and
atmospheric dynamics (mesoscale meterology) |
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