Análise das brisas de vale e montanha: influência e comportamento na região Nordeste do Brasil.

Abstract

Valley and mountain breezes are local atmospheric circulations that occur in regions of pronounced relief, such as mountains and valleys, due to differences in heating between slopes and low-lying areas. These breezes have a well-defined daily cycle and influence local atmospheric circulation, affecting variables such as temperature, humidity and wind. This work investigated the circulation of valley and mountain breezes in the Northeast region of Brazil throughout 2018, using data from the fifth generation of the reanalysis project of the European Center for Medium-Range Weather Forecasts (ECMWF). The objective was to analyze the behavior and intensity of these circulations in the Açu valley and Chapada Diamantina regions, using as a basis the zonal and meridional components of the horizontal vorticity vector. The results indicated that valley breezes predominate during the day, and mountain breezes, which occur at night, present distinct patterns of intensity and direction, strongly influenced by the topography of each area. The analysis highlights how the specific topographic characteristics of each region shape the dynamics of these circulations.