P3.3 Erosion of the nocturnal boundary layer in the Amazonia: during RaCCI / LBA

Monday, 2 August 2010
Castle Peak Ballroom (Keystone Resort)
Theomar T. A. T. Neves Sr., INPE/LUH, São José dos Campo, Brazil; and G. F. Fisch

Many rates of observed characteristics have significant changes after sunset and sunrise, mainly due to radiative effects and turbulent influence. The morning transition, characterized by erosion of nocturnal boundary layer (NBL) and convective formation (CBL), study contribute with basic understanding and support for initializing prognostic models. In this paper, observations in Amazonia in a transition period, defined here as the period between sunrise and the time when convection depth reaches about 200 m above ground level (AGL), instruments in surface and profiles from a theathred balloon have been analyzed to explore timings and factors influencing developmental changes near-surface and turbulent heat fluxes during the morning heating of atmospheric boundary layer. The results agreed with earlier studies and showed that during the morning transition, the heating of atmospheric layer was not completely due to surface heat fluxes, but was partly influenced by topographic effects and advection. During the dry to wet period was found almost the same mean quantity of heating to the atmospheric layer from the surface and others contribution, when compared to dry and wet station.
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