Eventos de Influência do Buraco de Ozônio Antártico Ocorridos em 2016 Sobre o Sul do Brasil

Abstract

The present study aims to analyze the stratospheric dynamics of the events of influence of the Antarctic Ozone Hole (BOA) that occurred over the South of Brazil in 2016. To reach this goal, days of reduction were used in the stratospheric ozone content based on Total Ozone Column (CTO) daily average data obtained from the Brewer spectrophotometer installed at the Southern Space Observatory (OES/INPE) (29.443752 ºS, 53.823084 ºW; 488.7 meters) and by the Ozone measuring instrument (Ozone Monitoring Instrument -OMI) onboard the NASA Aura satellite. For those days, stratosphere dynamics analyses were carried out through isentropic fields of Potential Vorticity (PV) at 600 and 700 K (Kelvin) levels of potential temperature, using the daily PV averages obtained from ERA-Interim reanalysis of ECMWF (European Center for Medium-range Weather Forecast) to verify the origin of the ozone-poor air masses. Thus, the confirmation of the origin of these masses through the retroactive trajectories obtained using the HYSPLIT model (HYbrid Single-Particle Lagrangian Integrated Trajectory) of NOAA (National Oceanic and Atmospheric Administration). In addition, images of the ozone content of the OMI satellite were used as a complementary technique to verify the performance of BOA over Southern Brazil. Then, 6 events of influence of the Antarctic Ozone Hole were identified over the South of Brazil in 2016, with an average reduction percentage of 11% of the CTO to monthly climatologies, confirmed by the passage of stratospheric polar filaments over the OES region, observed in the VP isentropic fields at the 600 and 700 K potential temperature levels as well as by the retroactive trajectories of polar origin obtained in the HYSPLIT model.