Influência da cobertura de cúmulos rasos no balanço de energia em superfície utilizando simulações numéricas com o BRAMS.

Abstract

Four alternative ways of calculating the shallow cumulus cloud cover were implemented in the BRAMS model using numerical simulation and modeling. The schemes are: Roeckner (1996), from what the ROEK experiment was run; Xu e Randall (1996), from what the XURA experiment was run; and Teixeira (2001), from what the TEI1 and TEI2 experiment were run. The difference between TEI1 and TEI2 is the value of the detrainment rate. The model was run for the Amazon region and results for a forest and a pasture area were compared against observed data. The results of the cloud cover are in agreement with those of the literature. The net radiation values are more realistic when the interaction between clouds and radiation is allowed. Sensible heat flux presents the poorest result while latent heat results are very close the observations when the interaction between cloud and radiation is present. In general, the results are more realistic over the forest than over the pasture. This suggests that the role of the surface in this process need to be better represented to study the energy budget.