[논문]Source regions and transport pathways of PM2.5 at a regional background site in East China

Zhang, Yanru; Zhang, Hongliang; Deng, Junjun; Du, Wenjiao; Hong, Youwei; Xu, Lingling; Qiu, Yuqing; Hong, Zhenyu; Wu, Xin; Ma, Qianli; Yao, Jie; Chen, Jinsheng

doi:10.1016/j.atmosenv.2017.08.031

Source regions and transport pathways of PM2.5 at a regional background site in East China 원문보기

Atmospheric environment, v.167, 2017년, pp.202 - 211

Zhang, Yanru (Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China) , Zhang, Hongliang (Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA) , Deng, Junjun (Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China) , Du, Wenjiao (Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China) , Hong, Youwei (Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China) , Xu, Lingling (Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China) , Qiu, Yuqing (Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China) , Hong, Zhenyu (Center for Excellence in Regional) , Wu, Xin , Ma, Qianli , Yao, Jie , Chen, Jinsheng

Abstract ▼ AI-Helper

Abstract PM2.5 samples were collected daily at the Lin'an regional background station (LA) in Zhejiang, China during 2014–2015 and the major chemical components including organic carbon (OC), elemental carbon (EC) and water-soluble inorganic ions (WSII) were determined. Backward trajectory clustering and potential source contribution function (PSCF) were adopted for identifying the transport pathways and potential source regions of PM2.5 at LA. The annual mean concentration was 68.9 ± 28.3 μg m−3, indicating severe pollution in East China. Obvious seasonal variations were found, with highest level in winter and lowest in summer. Carbonaceous aerosols and WSII were the predominant compositions, accounting for 30.7% and 53.5% of PM2.5, respectively. Secondary inorganic ions (SO4 2−, NO3 −, and NH4 +) made a total contribution of 45.2% to PM2.5. Heterogeneous formation played a dominant role in SO4 2− formation and NH4 + formation promoted NO3 − formation. Stationary sources played a more important role than mobile sources based on NO3 −/SO4 2− ratio of 0.53. Aerosol environment at LA was ammonium-poor and SO4 2− was only neutralized sufficiently by NH4 + with the predominant production of (NH4)2SO4 in winter. Four major transport pathways of air masses at LA were found based on trajectory clustering. Air masses from the northwest Gobi areas passing over the heavily polluted regions in North and Central China had the highest levels of PM2.5, followed by the air masses from Central China. PSCF results suggested that surrounding areas in the Yangtze River Delta region were major regional origins of PM2.5 and its major components. Northern region was an important origin for carbonaceous components, and southwestern region was significant for secondary inorganic ions. This study helps understand PM2.5 characteristics, identify potential source regions and effectively control PM2.5 in East China. Highlights Chemical characteristics of PM2.5 at a background site in China were studied. Heterogeneous chemistry dominated SO4 2− formation and NH4 + promoted NO3 − formation. Transport pathways of PM2.5 were identified based on trajectory clustering. Sources regions of PM2.5 and its components were investigated by PSCF.

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Source regions and transport pathways of PM2.5 at a regional background site in East China 원문보기

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