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Formation processes and source contributions of ground-level ozone in urban and suburban Beijing using the WRF-CMAQ modelling system

查看全文 作　　者：Shuxian [1]Zhang;Zhongzhi [1]Zhang;Yang [1]Li;Xiaohui [1,2]Du;Linglu [1]Qu;Wei [1]Tang;Jun [1]Xu;Fan [1,3]Meng 高影响力作者 机构地区：[1]Research Institute of Atmospheric Environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;[2]College of Water Sciences,Beijing Normal University,Beijing 100875,China;[3]Asia Center for Air Pollution Research,Niigata 950-2144,Japan高影响力机构 出　　处：《Journal of Environmental Sciences》索引2023年第5期,共14页高影响力期刊 基　　金：supported by the National Key Research and Development Program of China(No.2018YFC0213500);the National Key Research and Development Program of China(No.2017YFC0213003). 摘　　要：Beijing faces the challenge of high levels of ozone(O_(3))pollution.In this study,the Weather Research and Forecasting model and Community Multiscale Air Qualitymodel(CMAQ)were used to simulate atmospheric O_(3) concentrations in Beijing.To investigate the formation mechanisms and source contributions of O_(3) pollution in different regions of Beijing,process analysis and the integrated source apportionmentmethodwithin the CMAQwere applied to O_(3) concentrations in the summer of 2018.The process analysis results showed that vertical diffusion was the major contributor to O_(3) concentrations at all receptor sites in Beijing,at>65.94μg/(m^(3)·hr).Gas-phase chemical reactions consumed a significant amount of O_(3) in urban and inner suburban areas(>−5.57μg/(m^(3)·hr)),while near-surface chemical reactions made positive contributions in outer suburban areas(>4.72μg/(m^(3)·hr)).The O_(3) formation chemical reactions indicated that NO titration,which removes O_(3) at night-time,mainly occurred in urban areas.The weaker chemical reactions occurring near the surface in outer suburbs suggested that suburban-area O_(3) was produced in the upper atmospheric layers and was transported vertically to the lower layers.The O_(3) source apportionment results showed that boundary contributions were the dominant contributor to O_(3) pollution in Beijing(>40%).The contribution of non-local emissions to O_(3) levels was significantly greater in the outer suburbs than in urban and inner suburban areas due to topography.This study increases the understanding of the complex processes of O_(3) formation in different areas of Beijing and informs the implementation of O_(3) control plans. 关 键 词：OZONE Source apportionment Process analysis Air quality model
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