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DA ROCHA, V. R. Analysis of the cloud properties as a function of t he aerosol optical depth from MODIS products in the Amazon region during the dry season. 2011. 126f. Dissertation of Master Instituto de Astronomia, Geofísica e Ci ências Atmosféricas, Universidade de São Paulo, São Paulo, 2011. The effects of the interaction between aerosols an d clouds are studied in this work by analyzing the optical properties of clouds as a functi on of the aerosol optical depth (AOD). The studied area is the Amazon region, particularly during the dry season and the transition between the dry to wet season, when fires release large amounts of particles in the atmosphere. MODIS (Moderate Resolution Imaging Spectroradiometer) pro ducts are used and two papers are used as reference (Yu et al., 2007 and Koren et al., 2008). As observed by Koren et al. (2008), correlation between cloud cover fraction and AOD was observed i n this study, for a larger database, including years 2002 to 2008, both during the dry seasons and the transition between dry to wet. Six smaller areas in the Amazon were also investigated, using results from morning (Terra satellite) and afternoon (Aqua satellite) overpasses. These te sts were also conducted by restricting the data according to atmospheric conditions such as water v apor content intervals and atmospheric instability. In this case, only the microphysical effect was observed, but not the radiative.

Análise de propriedades de nuvens em função da profundidade óptica do aerossol a partir de produtos derivados pelo MODIS da região amazônica durante a estação seca