Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region  

作　　者：Jinbo Wang Jiaping Wang Wei Nie Xuguang Chi Dafeng Ge Caijun Zhu Lei Wang Yuanyuan Li Xin Huang Ximeng Qi Yuxuan Zhang Tengyu Liu Aijun Ding 

机构地区：[1]Joint International Research Laboratory of Atmospheric and Earth System Sciences,School of Atmospheric Sciences,Nanjing University,Nanjing 210023,China [2]Jiangsu Provincial Collaborative Innovation Center of Climate Change,Nanjing 210023,China [3]National Observation and Research Station for Atmospheric Processes and Environmental Change in Yangtze River Delta,Nanjing 210023,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第9期221-232,共12页环境科学与工程前沿（英文）

基　　金：supported by National Natural Science Foundation of China(No.42005082).

摘　　要：Organic aerosol(OA)is a major component of atmospheric particulate matter(PM)with complex composition and formation processes influenced by various factors.Emission reduction can alter both precursors and oxidants which further affects secondary OA formation.Here we provide an observational analysis of secondary OA(SOA)variation properties in Yangtze River Delta(YRD)of eastern China in response to large scale of emission reduction during Chinese New Year(CNY)holidays from 2015 to 2020,and the COVID-19 pandemic period from January to March,2020.We found a 17%increase of SOA proportion during the COVID lockdown.The relative enrichment of SOA is also found during multi-year CNY holidays with dramatic reduction of anthropogenic emissions.Two types of oxygenated OA(OOA)influenced by mixed emissions and SOA formation were found to be the dominant components during the lockdown in YRD region.Our results highlight that these emission-reduction-induced changes in organic aerosol need to be considered in the future to optimize air pollution control measures.

关 键 词：Emission control Secondary organic aerosol Atmospheric oxidizing capacity Holiday effects COVID-19 lockdown 

分 类 号：X51[环境科学与工程—环境工程] X16