Análise dos Dois Principais Fatores de Decaimento da Coluna Total de Ozônio sobre o Sul da América do Sul
DOI:
https://doi.org/10.5902/2179460X12812Keywords:
Ozônio, América do Sul, OMI, radiação UV.Abstract
O ozônio (O3) é indispensável para a vida na Terra pois absorve radiação ultravioleta do tipo B (UV-B) que é prejudicial para a saúde de seres vivos. Desde o início da década de 1980 relatou-se a existência de uma depleção na camada de ozônio sobre a Antártica e que esta poderia se mover para latitudes menores. O objetivo deste trabalho é a análise dos principais eventos de decaimento da coluna total de ozônio sobre a América do Sul (20°S, 40°S e 30°W, 80°W) entre 2004 e 2011, através da comparação com a média mensal e limiar de seis localidades. Ao comparar as duas maiores seqüências de dias abaixo do limiar (05 dias em cada evento) no período de estudo para meses distintos, constatou-se decaimento da coluna total de ozônio para o mês de maio de 2010 devido à circulação Brewer-Dobson que mistura o ar pobre em ozônio da região tropical com o ar da região Antártica. O mês de outubro de 2010 apresentou decaimento devido ao efeito secundário (origem Antártica). Percebeu-se que os valores apresentados durante os eventos de decaimento da coluna total de ozônio no mês de maio são menores que os decorrentes do efeito secundário em outubro.
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