On the seasonal variation of the surface ozone in Athens,Greece |
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| Institution: | 1. Instituto de Geociências, Universidade de Brasília, Campus Universitário Darcy Ribeiro, CEP 70910-900 Brasília, DF, Brazil;2. Instituto do Petróleo e dos Recursos Naturais, Pontifícia Universidade Católica do Rio Grande do Sul, Av. Ipiranga, 6681, prédio 96J, CEP 90619-900 Porto Alegre, RS, Brazil;3. Programa de Pós Graduação em Geociências, Instituto de Ciências Exatas e da Terra, Universidade Federal de Mato Grosso, CEP 78060-900 Cuiabá, MT, Brazil;1. Georgia Institute of Technology, Atlanta, GA, United States;2. University of Crete, Heraklion, Greece;3. National Observatory of Athens, Athens, Greece;1. Department of Mathematical Sciences, University of Zululand, Private Bag X1001, KwaDlangezwa, 3886, South Africa |
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| Abstract: | An attempt has been made to examine the seasonal variation of the surface ozone mixing ratio in Athens, Greece during the periods 1901–1940 and 1987–1998. The first finding is that in July and August while the daytime surface ozone mixing ratio from the beginning until the end of the 20th century has increased by approximately 1.8 times, the nighttime surface ozone mixing ratio remained approximately at the same level. The second finding is that the increase in the mean daytime mixing ratio during the transition period from winter to summer is equal to the increase in the maximum daytime mixing ratios, whilst the enhancement of the nighttime surface ozone maxima is stronger than that of the nighttime mean surface ozone mixing ratio. Plausible explanation for this finding is given through mechanisms like long-range transport and photochemical processes occurring in the boundary layer, free troposphere and lower stratosphere. |
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