Influência da zona de convergência secundária do Atlântico Sul sobre a ocorrência de precipitação no leste do Nordeste brasileiro.

Abstract

The objective to identify and analyze the atmospheric features in the tropical Atlantic linked to South Atlantic Secundary Convergence Zone (SASCZ) and relate them to the occurrence of precipitation in northeast Brazil, were used sea surface temperature (SST) data, fields zonal and meridional wind, air temperature, specific humidity, omega (vertical wind), pressure reduced to mean sea level, precipitation at points of regular grid of 2.5° x 2.5° from the climate diagnostics center (CDC) of the National Oceanic ant Atmospheric Administration (NOAA), daily precipitation data from Water Management Agency of the Paraíba state (AESA), from the Laboratory of Meteorology of the Technological Institute of Pernambuco (LAMEPE/ITEP) and National Institute of Meteorology (INMET) for the period May 1982 to August 2006, were also used data on the action of frontal systems in Brazil for the period May 1987 to August 2005 taken from the Bulletin Climanálise. The results showed that the increase in SST in the west coast of South America can produce upward movement in the region and descended on the Atlantic West Tropical hindering the formation of the SASCZ, there was increase in the longitudinal SST gradient, reduced pressure level average sea, air temperature and specific humidity at 1000 hPa in the years of operation of the ITCZ than in those without performance and neutrality, the SASCZ contributes to increased precipitation in the east of the northeast, but their absence does not produce dry, because the SASCZ is just one of weather systems capable of producing rainfall in eastern NEB; the role of frontal systems in southern Brazil is probably one of the mechanisms for the formation of the SASCZ, and the High pressure center of the South Atlantic weaker and shifted to the northeast favors the formation of the SASCZ.