Processos e trocas energéticas no desenvolvimento da camada limite planetária

Abstract

The Planetary Boundary Layer (PBL) is the lowest layer of the troposphere and is greatly influenced by heat exchange, momentum fluxes and wind speeds occurring near the surface. Therefore, with the purpose of increasing the understanding of the physical processes related to the development of the PBL, this study analyzes the height of the planetary boundary layer and its relationship with the radiation balance and turbulence, using vertical profiles of potential temperature, wind and radiation balance, for a time series carried out during the GOAmazon experiment (Objevations and Modeling of the Green Ocean) with in the Amazon region (Manacapuru), for a dry and rainy month in 2015. The results showed that the turbulence had greater intensity in the dry month due to the strong occurrence of sensible heat flux. The rainy month, due to the occurrence of precipitation and cloudiness, a lower occurrence of radiation was observed. Due to the occurrence of less radiation reaching the surface layer, there was a lower flow of sensible heat, which cooperated for a lower surface temperature, as well as influencing the occurrence of a weaker turbulence. Therefore, lower heights of the Planetary Boundary Layer were observed in the wettest month compared to the dry month.