Effect of potential HONO sources on peroxyacetyl nitrate(PAN)formation in eastern China in winter  

作　　者：Jingwei Zhang Yitian Guo Yu Qu Yong Chen Ruipeng Yu Chaoyang Xue Rui Yang Qiang Zhang Xingang Liu Yujing Mu Jing Wang Can Ye Haihan Zhao Qiangqiang Sun Ziwen Wang Junling An 

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,Beijing 100029,China [2]College of Earth Science,University of Chinese Academy of Sciences,Beijing 100049,China [3]College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China [4]Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [5]Guangzhou Meteorological Observatory,Guangzhou 511430,China [6]Ministry of Education Key Laboratory for Earth System Modeling,Department of Earth System Science,Tsinghua University,Beijing,China [7]Collaborative Innovation Center for Regional Environmental Quality,Beijing,China [8]State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China [9]Center for Excellence in Urban Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [10]College of Land Science and Technology,China Agricultural University,Beijing 100193,China [11]Qinghai Climate Center,Qinghai Meteorological Bureau,Xining,Qinghai 810001,China

出　　处：《Journal of Environmental Sciences》2020年第8期81-87,共7页环境科学学报（英文版）

基　　金：This work was partially supported by the National Key Research and Development Program of China(No.2017YFC0209801);the National Natural Science Foundation of China(Nos.91544221,41575124);the National Research Program for Key Issues in Air Pollution Control(Nos.DQGG0102,DQGG0103).

摘　　要：As an important secondary photochemical pollutant,peroxyacetyl nitrate(PAN)has been studied over decades,yet its simulations usually underestimate the corresponding observations,especially in polluted areas.Recent observations in north China found unusually high concentrations of PAN during wintertime heavy haze events,but the current model still cannot reproduce the observations,and researchers speculated that nitrous acid(HONO)played a key role in PAN formation.For the first time we systematically assessed the impact of potential HONO sources on PAN formation mechanisms in eastern China using the Weather Research and Forecasting/Chemistry(WRF-Chem)model in February of 2017.The results showed that the potential HONO sources significantly improved the PAN simulations,remarkably accelerated the RO x(sum of hydroxyl,hydroperoxyl,and organic peroxy radicals)cycles,and resulted in 80%–150%enhancements of PAN near the ground in the coastal areas of eastern China and 10%–50%enhancements in the areas around 35–40°N within 3 km during a heavy haze period.The direct precursors of PAN were aldehyde and methylglyoxal,and the primary precursors of PAN were alkenes with C>3,xylenes,propene and toluene.The above results suggest that the potential HONO sources should be considered in regional and global chemical transport models when conducting PAN studies.

关 键 词：Nitrous acid(HONO) Peroxyacetyl nitrate(PAN) WRF-Chem model Winter haze RO x cycles 

分 类 号：X515[环境科学与工程—环境工程]