Ozone sounding in the Metropolitan Area of Sao Paulo, Brazil: Wet and dry season campaigns of 2006

Autor(es):Mostrar menos -

de Fatima, Andrade Maria ^[1] ; Fornaro, Adalgiza ^[1] ; Dias de, Freitas Edmilson ^[1] ; Mazzoli, Caroline R. ^[1] ; Martins, Leila Droprinchinski ^[2] ; Boian, Claudia ^[3] ; Lopes Oliveira, Marcio Gledson ^[1] ; Peres, Jean ^[1] ; Carbone, Samara ^[1] ; Alvala, Plinio ^[4] ; Leme, Neusa Paes ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Atmospher Sci, Inst Astron Geophys & Atmospher Sci, BR-05508090 Sao Paulo - Brazil

^[2] Fed Technol Univ Parana, BR-86812460 Apucarana - Brazil

^[3] Fed Univ ABC, BR-09210170 Santo Andre - Brazil

^[4] Brazilian Natl Inst Space Res, BR-12227010 Sao Jose Dos Campos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Atmospheric Environment; v. 61, p. 627-640, DEC 2012.
• Citações Web of Science: 14

Resumo

In the Metropolitan Area of Sao Paulo (MASP), located in southeastern Brazil, surface ozone concentrations are often well above the national air quality standards. In this experimental study, we attempted to characterize the vertical profile of atmospheric ozone and transport of the ozone plume in the boundary layer, using data from the first ozone soundings ever taken in the MASP. In 2006, we launched fifteen ozonesondes: eight from 15 to 18 May (dry season); and seven from 30 October to 1 November (wet season). Vertical ozone mixing ratios in the troposphere were approximately 40 ppb, reaching maximum values of approximately 60 ppb during the dry-season campaign and approximately 100 ppb during the wet-season campaign. In the first and second campaigns, the mean tropospheric ozone column abundance was 28.2 and 41.3 DU, respectively, which can be attributed to the considerable variation in the annual temperature cycle over the region. To determine the effect that biomass burning has on ozone concentrations over the MASP, we analyzed wind trajectories and satellite-derived fire counts. We cannot state unequivocally that biomass burning contributed to higher ozone concentrations above the boundary layer during the experimental campaigns. In the boundary layer, ozone concentrations increase with altitude, peaking at the base of the inversion layer, suggesting that local emissions of volatile organic compounds and nitrogen oxides play a significant role in the lower troposphere over MASP, influencing ozone formation not only at the surface but also vertically in the atmosphere and in distant regions. (C) 2012 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 03/06414-0 - Implementação de modelo de qualidade do ar para a região metropolitana de São Paulo
• Beneficiário: Maria de Fátima Andrade
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisa em Políticas Públicas