A short climatology of black and brown carbon and their sources at a suburban site impacted by smoke in Brazil  

作　　者：Admir Creso Targino Patricia Krecl Gabriel Yoshikazu Oukawa Eva Maria Mollinedo 

机构地区：[1]Graduate Program in Environmental Engineering,Federal University of Technology,Av.Pioneiros 3131,Londrina,PR 86036-370,Brazil [2]Department of Environmental Engineering,Federal University of Technology,Av.Pioneiros 3131,Londrina,PR 86036-370,Brazil

出　　处：《Journal of Environmental Sciences》2024年第2期498-511,共14页环境科学学报（英文版）

基　　金：financial resources from the Coordination for the Improvement of Higher Education Personnel (CAPES/Brazil)。

摘　　要：Emissions from biomass burning challenge efforts to curb air pollution in cities downwind of fire-prone regions,as they contribute large amounts of brown carbon(Br C)and black carbon(BC)particles.We investigated the patterns of Br C and BC concentrations using Aethalometer data(atλ=370 and 880 nm,respectively)spanning four years at a site impacted by the outflow of smoke.The data required to be post processed for the shadowing effect since,without correction,concentrations would be between 29%and 35%underestimated.The Br C concentrations were consistently higher than the BC concentrations,indicating the prevalence of aerosols from biomass burning.The results were supported by the Angstrom coefficient(A_(370/880)),with values predominantly larger than 1(mean±standard deviation:1.25±0.31).A_(370/880)values below 1 were more prevalent during the wet season,which suggests a contribution from fossil fuel combustion.We observed sharp Br C and BC seasonal signals,with mean minimum concentrations of 0.40μg/m^(3)and 0.36μg/m^(3),respectively,in the wet season,and mean maximum concentrations of 2.05μg/m^(3)and 1.53μg/m^(3)in the dry season.The largest concentrations were observed when northerly air masses moved over regions with a high density of fire spots.Local burning of residential solid waste and industrial combustion caused extreme Br C and BC concentrations under favourable wind directions.Although neither pollutant is included in any ambient air quality standards,our results suggest that transboundary smoke may hamper efforts to meet the World Health Organization guidelines for fine particles.

关 键 词：Light-absorbing carbonaceous matter Black carbon WILDFIRES Biomass burning AETHALOMETER 

分 类 号：X513[环境科学与工程—环境工程]