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The distinction between convective and stratiform precipitation profiles around various precipitating systems existent in tropical regions is very important to the global atmospheric circulation, which is extremely sensitive to vertical latent heat distribution. In South America, the convective activity responds to the Intraseasonal Oscillation (IOS). This paper analyzes a disdrometer and a radar profiler data, installed in the Ji-Paraná airport, RO, Brazil, for the field experiment WETAMC/LBA & TRMM/LBA, during January and February of 1999. The microphysical analysis of wind regimes associated with IOS showed a large difference in type, size and microphysical processes of hydrometeor growth in each wind regime: easterly regimes had more turbulence and consequently convective precipitation formation, and westerly regimes had a more stratiform precipitation formation. A diferenciação entre os perfis de precipitação convectiva e estratiforme dentre os diversos sistemas de precipitação existentes na região tropical é muito importante para a circulação atmosférica global, sendo extremamente sensível à distribuição vertical de calor latente. Na América do Sul, a atividade convectiva responde à Oscilação Intrasazonal (IOS). Este trabalho analisa dados de um disdrômetro e um radar de apontamento vertical instalados no aeroporto de Ji-Paraná, RO, Brasil, para o experimento de campo WETAMC/LBA & TRMM/LBA, em Janeiro e Fevereiro de 1999. A breve análise dos regimes de ventos associados à IOS mostrou um grande diferença no tipo, tamanho e processos microfísicos de crescimento de hidrometeoros em cada regime de vento: regimes de leste possuem mais turbulência e conseqüentemente formação de precipitação convectiva, e regimes de oeste possuem formação de precipitação mais estratiforme

acta amazonica

Microphysical evidence of the transition between predominant convective/stratiform rainfall associated with the intraseasonal oscillation in the Southwest Amazon