Exploring HONO formation and its role in driving secondary pollutants formation during winter in the North China Plain  

作　　者：Shaobin Zhang Guo Li Nan Ma Yao He Shaowen Zhu Xihao Pan Wenlin Dong Yanyan Zhang Qingwei Luo Jeannine Ditas Uwe Kuhn Yuxuan Zhang Bin Yuan Zelong Wang Peng Cheng Juan Hong Jiangchuan Tao Wanyun Xu Ye Kuang Qiaoqiao Wang Yele Sun Guangsheng Zhou Yafang Cheng Hang Su 

机构地区：[1]Institute for Environmental and Climate Research,Jinan University,Guangzhou 511443,China [2]Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Guangzhou 511443,China [3]Max Planck Institute for Chemistry,Mainz 55128,Germany [4]School of Atmospheric Sciences,Nanjing University,Nanjing 210023,China [5]Institute of Mass Spectrometry and Atmospheric Environment,Jinan University,Guangzhou 510632,China [6]State Key Laboratory of Severe Weather&Key Laboratory for Atmospheric Chemistry,Institute of Atmospheric Composition,Chinese Academy of Meteorological Sciences,Beijing 100081,China [7]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [8]Gucheng Experimental Station of Ecological and Agricultural Meteorology,Chinese Academy of Meteorological Sciences,Beijing 100081,China

出　　处：《Journal of Environmental Sciences》2023年第10期83-97,共15页环境科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China (No. 2017YFC210104);the National Natural Science Foundation of China (No. 91644218);the Guangdong Innovative and Entrepreneurial Research Team Program (No. 2016ZT06N263);the Special Fund Project for Science and Technology Innovation Strategy ofGuangdong Province (No. 2019B121205004);the financial support from the China Scholarship Council (CSC)

摘　　要：Daytime HONO photolysis is an important source of atmospheric hydroxyl radicals(OH).Knowledge of HONO formation chemistry under typical haze conditions,however,is still limited.In the Multiphase chemistry experiment in Fogs and Aerosols in the North China Plain in 2018,we investigated the wintertime HONO formation and its atmospheric implications at a rural site Gucheng.Three different episodes based on atmospheric aerosol loading levels were classified:clean periods(CPs),moderately polluted periods(MPPs)and severely polluted periods(SPPs).Correlation analysis revealed that HONO formation via heteroge.neous conversion of NO_(2)was more efficient on aerosol surfaces than on ground,highlighting the important role of aerosols in promoting HONO formation.Daytime HONO budget analysis indicated a large missing source(with an average production rate of 0.66±0.26,0.97±0.47 and 1.45±0.55 ppbV/hr for CPs,MPPs and SPPs,respectively),which strongly correlated with photo-enhanced reactions(NO_(2)heterogeneous reaction and particulate nitrate photolysis).Average OH formation derived from HONO photolysis reached up to(0.92±0.71),(1.75±1.26)and(1.82±1.47)ppbV/hr in CPs,MPPs and SPPs respectively,much higher than that from O3 photolysis(i.e.,(0.004±0.004),(0.006±0.007)and(0.0035±0.0034)ppbV/hr).Such high OH production rates could markedly regulate the atmospheric oxidation capacity and hence promote the formation of secondary aerosols and pollutants.

关 键 词：HONO North China Plain Budget analysis OH radicals 

分 类 号：X51[环境科学与工程—环境工程]