Evolutionary processes and sources of high-nitrate haze episodes over Beijing,Spring

查看全文 作　　者：Ting [1]Yang;Yele [1]Sun;Wei [2]Zhang;Zifa [1]Wang;Xingang [3]Liu;Pingqing [1]Fu;Xiquan [1]Wang

机构地区：[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;[2]Aviation Meteorological Center of China, Beijing 100021, China;[3]State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100089, China

出　　处：《Journal of Environmental Sciences》索引2017年第29卷第4期,共10页

基　　金：supported by the National Natural Science Foundation of China(No.41305115);the National Key Project of Basic Research(No.2014CB447900);the Commonweal Project in Ministry of Environmental Protection(Nos.201409001,201309011);the Hi-Tech Research and Development Program(863) of China(No.2014AA06AA06A512) 摘　　要：Rare and consecutive high-nitrate haze pollution episodes were observed in Beijing in spring2012. We present detailed characterization of the sources and evolutionary mechanisms of this haze pollution, and focus on an episode that occurred between 15 and 26 April. Submicron aerosol species were found to be substantially elevated during haze episodes, and nitrates showed the largest increase and occupation(average: 32.2%) in non-refractory submicron particles(NR-PM_1), which did not occur in other seasons as previously reported. The haze episode(HE) was divided into three sub-episodes, HEa, HEb, and HEc. During HEa and HEc, a shallow boundary layer, stagnant meteorological conditions, and high humidity favored the formation of high-nitrate concentrations, which were mainly produced by three different processes —daytime photochemical production, gas-particle partitioning, and nighttime heterogeneous reactions — and the decline in visibility was mainly induced by NR-PM_1.However, unlike HEa and HEc, during HEb, the contribution of high nitrates was partly from the transport of haze from the southeast of Beijing — the transport pathway was observed at ~800–1000 m by aerosol Lidar —and the decline in visibility during HEb was primarily caused by PM_(2.5). Our results provide useful information for air quality improvement strategies in Beijing during Spring. 关键词：薄雾硝酸盐来源激光雷达喷雾器化学种形成监视器边界层

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Evolutionary processes and sources of high-nitrate haze episodes over Beijing,Spring

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