Efeitos secundários do buraco de ozônio antártico sobre a região Sul do Brasil

Abstract

The antarctic ozone hole is defined as the area where the ozone total column is less than 220 DU. Due to the polar vortex, the ozone poor air masses are restricted to high latitudes. However, some air masses can reach lower latitudes. Data from TOMS and OMI spectrophotometers show this fact. There are some works that indicate these ozone reductions from August to November, where it is expected a seasonal maximum. This reductions received the name: secondary effects of the antarctic ozone hole. This work shows a 20-years analysis of the TOMS and OMI spectrophotometers data, to September and October of each year, from 1987 to 2007. It was chosen the 36 events with less ozone total column in this period of the year, which could presented secondary effects. For each event, it was applied a three-part methodology: (1) ozone total column analysis with satellite data, (2) backward air masses trajectories generation with HYSPLIT model from NOAA and (3) potential vorticity maps analysis. From the 36 days with ozone minima, there were found 16 events of secondary effects, 3 in Septembers and 13 in Octobers.