Synoptic Weather System Associated with Influence of the Antarctic Ozone Hole over the South of Brazil on October, 13TH, 2010

Abstract

During spring, poor ozone air masses can come out of the Antarctic Ozone Hole and reach mid and low latitude areas like the South of Brazil forming a known phenomenon called “Secondary E ects of the Antarctic Ozone Hole”. One of these phenomena was observed on October, 13th, 2010, by OMI Spectrometer over Southern Space Observatory (29.42° S and 53.87° W), in São Martinho da Serra, Brazil. Stratospheric potential vorticity maps on isentropic surfaces and air mass backward trajectory using HYSPLIT model by NOAA con rmed the polar origin of the poor ozone air mass. A description of the synoptic weather system during the event was made by wind eld daily average at 250 hPa level and Omega at 500 hPa, thickness between 1000 and 500 hPa levels and GOES 10 enhance satellite image. It was observed that the event of low ozone occurred at the same time as a high pressure pos frontal system was passing over the south of Brazil and the subtropical jet stream le the weather stable and without clouds. ese actions favored the intrusion of the stratospheric air in the troposphere and helped the stratospheric air mass transport from the polar region to the South of Brazil.