Transporte de vapor d’água em casos de ZCAS.

Abstract

In this study, the transport of water vapor vertically integrated into the atmosphere was analyzed in episodes of the South Atlantic Convergence Zone (SACZ). Four cases were selected between January and March 2018. ERA-Interim data from the European Center for Medium-Range Weather Forecasts (ECMWF) were used to construct the maps of the vertically integrated water vapor flow and the respective divergence. Two subareas of 5º by 5º, centralized in the cities of Belo Horizonte and São Paulo, were used as control volume for water vapor balance. The results point to the existence of water vapor transport from the Amazon region to the southeast of Brazil associated to the performance of the SACUs. Areas of convergence of vertically integrated water vapor predominate along the northwest - southeast line. The water vapor balance has an average of -1.8; - 12.9; -0.7 and -5.0 mm / day for cases 1; 2; 3 and 4, respectively over the Belo Horizonte area and -3.6; 2.0; -8.3 and 8.5 mm / day for cases 1; 2; 3 and 4, respectively on the São Paulo area. Negative values indicate that precipitation has exceeded evapotranspiration (water vapor sink).