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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 8
Ann. Geophys., 17, 1095–1110, 1999
© European Geosciences Union 1999
Ann. Geophys., 17, 1095–1110, 1999
© European Geosciences Union 1999

  31 Aug 1999

31 Aug 1999

Meso-scale effects of tropical deforestation in Amazonia: preparatory LBA modelling studies

A. J. Dolman1, M. A. Silva Dias2, J.-C. Calvet3, M. Ashby1, A. S. Tahara5, C. Delire3, P. Kabat1, G. A. Fisch4, and C. A. Nobre5 A. J. Dolman et al.
  • 1DLO Winand Staring Centre, Wageningen, the Netherlands
  • E-mail:
  • 2University of São Paulo, São Paulo, Brazil
  • 3Meteo France/CNRM, Toulouse, France
  • 4Centro Tecnico Aerospacial, Sao Jose dos Campos, Brazil
  • 5Centro de Previsao de Tempo e Estudos Climaticos, INPE/CPTEC, Cachoeira Paulista, Brazil

Abstract. 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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