Estudo da atuação do anticiclone subtropical do Atlântico Sul (ASAS) sobre o Parque Estadual do Rio Doce (PERD) e seu entorno

Abstract

This work deals with an analysis of the climatology of the South Atlantic Subtropical Anticyclone (ASAS) over the Rio Doce State Park (PERD) region and its surroundings, passing through the seasonal and decendial assessment of climatic elements, relative humidity, atmospheric pressure and average temperature in the period between 2005-2015. In order to carry out this analysis, data were used referring to the decency averages of the climatic parameters of the meteorological stations of Caratinga and Timóteo, belonging to the National Meteorological Institute (INMET), in addition to Ipatinga and PERD, of the National Intitute for Space Research (INPE). When spatializing the climatic parameters, one hundred and eight decendial maps were created, in addition to graphs and the use of seventy-two decendial maps, with reanalysis data from the NCEP (National Center for Enviroment Prediction), corresponding to the levels of 200 hPa and 850 hPa, obtained via the CDC / NOAA portal (Climate Diagnostic Center / National Oceanicand Atmospheric Administration) in order to analyze the atmospheric dynamics over the PERD region and surroundings. Seasonal and decendial analyzes allowed to identify different scenarios involving the performance of atmospheric systems that influence the region. The records of the dry season showed a low variability in climatic elements, marked by a decrease in the values of relative humidity and temperature that are linked to the increase in atmospheric pressure. In this period, the performance of atmospheric mechanisms at high levels was marked by the retreat of Alta de Bolivia (AB) and the advance of Cavado do Nordeste (CN) over the South American continent, while at low levels ASAS remained persistent with its center positioned on the Atlantic Ocean and its border located on the PERD region, in which the configuration of an atmospheric block was verified in the 3rd ten-day period of April. As for the rainy season, it was identified that the relative humidity and average temperature showed an increase, while the atmospheric pressure showed a small oscillation over the variability, marked by a reduction in most barometric quotas and a slight increase in January and February. The atmospheric dynamics in this period was marked by an intense performance of atmospheric mechanisms in the ten days of January and February, with the presence of AB in its climatological position, in addition to the CN that configured the formation of an atmospheric block, in which together with the position of the ASAS, resulted in subsidiary movements of dry air. It should be noted that the adiabatic subsidence of the air reduced the values of atmospheric pressure and the percentages of relative air humidity in the middle of the rainy season, in addition to an increase in temperature values. This fact contributed to the formation of a climatic summer, on the surface.