Model analysis of secondary organic aerosol over China with a regional air quality modeling system(RAMS-CMAQ)  

作　　者：LI Jia-Lin ZHANG Mei-Gen GAO Yi CHEN Lei 

机构地区：[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC),Institute of Atmospheric Physics(IAP),Chinese Academy of Sciences(CAS) [2]College of Earth Science,University of Chinese Academy of Sciences [3]Center for Excellence in Urban Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2016年第6期443-450,共8页大气和海洋科学快报（英文版）

基　　金：supported by the‘Strategic Priority Research Program(B)’of the Chinese Academy of Sciences[XDB05030105],[XDB05030102],[XDB05030103];the National Basic Research Program of China[2014CB953802]

摘　　要：The regional air quality modeling system RAMS-CMAQ was updated to incorporate secondary organic aerosol （SOA） production from isoprene and sesquiterpene and to account for the SOA production rate dependence on NOx and SOA aging. The system was then used to simulate spatiotemporal distributions of SOA concentration and its major constituents over China in winter. Modeled monthly mean SOA concentrations were high in central and eastern China and low in western regions. The highest SOA appeared in regions from Beijing-Tianjin-Hebei （BTH） to the middle reaches of the Yangtze River and areas from Sichuan Basin to the southwest border of China, where SOA contributions were less than 10% of the organic aerosol （OA）. The lowest concentration was in the Qinghai-Tibet Plateau, accounting for 20%-30% of OA. It is notable that contributions from anthropogenic precursors to SOA were significant in winter, especially the wide areas of central and eastern China with contributions generally varying from 50% to 80% of the total SOA. Beijing was used as an example location representative of the heavily polluted BTH area for analysis of major components of SOA. Though the modeled concentration of SOA was still underestimated compared to the observations, it still showed that xylene and toluene were the two greatest contributors to anthropogenic SOA, which was in agreement with the observations. SOA produced from monoterpene was the greatest contributor to biogenic SOA due to the high mass yield of monoterpene, followed by isoprene. More than 57% of SOAs were aged, which may increase the extinction effect of SOA.为了研究我国二次有机气溶胶(SOA)时空分布及其主要组分,更新了RAMS-CMAQ的SOA模块,主要考虑SOA老化,不同NOx浓度下SOA的形成以及异戊二烯和倍半萜烯生成SOA的机制。结果表明,SOA在我国中东部地区浓度较高而在西部则较低。高SOA覆盖两块区域:京津冀到长江中游及四川盆地到我国西南边界,但对有机气溶胶(OA)的贡献不到10%,低SOA主要出现在青藏高原,占OA的20%–30%。值得注意的是,冬季人为源前体物对SOA的贡献显著,在中东部地区可达50%–80%。在北京,人为源SOA主要前体物是甲苯和二甲苯而单萜烯则是生物源SOA主要前体物。SOA的老化部分超过57%,这可能是SOA消光增强的原因。

关 键 词：Organic aerosol HAZE BEIJING-TIANJIN-HEBEI VOCS 

分 类 号：X513[环境科学与工程—环境工程]