华北区域本底地区夏季近地面臭氧来源的量化解析OACSTPCD

This study uses the Shangdianzi national background station in Beijing to represent the background area in North China,and adopts the Ozone Source Appointment Technology(OSAT)method of the CAMx model to analyze the ozone source contribution in North China background areas from June 25 to July 31,2019.A simula-tion study of O3 concentration was conducted to quantify the contribution of different source components and tag-ging regions,aiming to deeply analyze the source composition of ground-level O3 concentration in the background area of North China.The components that contribute to the ground O3 concentration in this region,from high to low,were boundary transport(61.8%),source transport(31.8%),background concentration(3.3%),and local generation(3.1%).The main source tagging regions from high to low were were Hebei province(5.70%),In-ner Mongolia autonomous region(5.43%),and Shandong province(4.48%).The source categories were civil source(15.35%),agricultural source(10.72%),transportation source(7.21%),and industrial source(1.62%),and the main precursors were NOx(29.6%)and VOCs(5.3%).The ground ozone concentration in North China background area is mainly contributed by boundary transport and source transport,which further vali-dates the rationality for Shangdianzi station as an atmospheric background station.