Surface ozone climatology of South Eastern Brazil and the impact of biomass burning events

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:252

Article

Targino, Admir Creso^1,4  Harrison, Roy M.^2,5  Krecl, Patricia¹  Glantz, Paul³  de Lima, Caroline Hatada^1,4  Beddows, David² 

[1] Fed Univ Technol, Grad Program Environm Engn, Av Pioneiros 3131, BR-86036370 Londrina, PR, Brazil

[2] Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England

[3] Stockholm Univ, Dept Environm Sci & Analyt Chem, Svante Arrhenius Vag 8, S-10691 Stockholm, Sweden

[4] Univ Estadual Londrina, Grad Program Geog, Rod Celso Garcia,Km 380, BR-86057970 Londrina, PR, Brazil

[5] King Abdulaziz Univ, Ctr Excellence Environm Studies, Dept Environm Sci, POB 80203, Jeddah 21589, Saudi Arabia

关键词: Short-lived climate forcer;    Transboundary pollution;    Cluster analysis;    Air quality;    Agricultural fire;   

DOI  :  10.1016/j.jenvman.2019.109645

来源: Elsevier

【 摘 要 】

In the austral spring, biomass fires affect a vast area of South America each year. We combined in situ ozone (O-3) data, measured in the states of Sao Paulo and Parana, Brazil, in the period 2014-2017, with aerosol optical depth, co-pollutants (NOx, PM2.5 and PM10) and air backtrajectories to identify sources, transport and geographical patterns in the air pollution data. We applied cluster analysis to hourly O-3 data and split the investigation area of approximately 290,000 km(2) into five groups with similar features in terms of diurnal, weekly, monthly and seasonal O-3 concentrations. All groups presented a peak in September and October, associated with the fire activities and enhanced photochemistry. The highest mean O-3 concentrations were measured inland whilst, besides having lower concentrations, the coastal group was also associated with the smallest diurnal and seasonal variations. The latter was attributed to lower photochemical activity due to frequently occurring overcast weather situation. The mean annual regional contribution of O-3 over the area was 61 mu g/m(3), with large seasonal and intersite variabilities (from 35 to 84 mu g/m(3)). The long-range transport of smoke contributed with between 23 and 41% of the total O-3 during the pollution events. A pollution outbreak in September 2015 caused many-fold increases in O-3, PM2.5 and PM10 across the investigation area, which exceeded the World Health Organisation recommendations. We show that the regional transport of particulates and gas due to biomass burning overlays the local emissions in already highly polluted cities. Such an effect can outweigh local measures to curb anthropogenic air pollution in cities.

【 授权许可】

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