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Long-term winter observation of nitrous acid in the urban area of Beijing

Journal of Environmental Sciences 2022年第4期34卷 334-342页

作者： Chaofan Lian Weigang Wang Yan Chen Yusheng Zhang Jingwei Zhang Yongchun Liu Xiaolong Fan Chang Li Junlei Zhan Zhuohui Lin Chenjie Hua Wenyu Zhang Mingyuan Liu Junling Li Xuefei Wang Junling An Maofa Ge State Key Laboratory for Structural Chemistry of Unstable and Stable Species CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of the Chinese Academy of Sciences Beijing 100049China Aerosol and Haze Laboratory Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric Physics(IAP)Chinese Academy of SciencesBeijing 100029China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Center for Excellence in Urban Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

The particulate matter(PM)pollution has been significantly improved by carrying out various valid emission control strategies since 2013 in *** the variation trend of nitrous acid(HONO)is worthy to investigate due to its vital role in the atmospheric oxidation *** this study,field observation in the winter is conducted to investigate the concentration of HONO in an urban area of *** the winter of 2019,the mean HONO concentration is 1.38 ppbV during the whole ***-enhanced NO_(2)heterogeneous reactions on the ground and aerosol surfaces were found as the possible daytime sources of *** to O_(3),photolysis of HONO dominates the primary OH sources during the winter *** understand the HONO pollution patterns by years variation,multi-year data is summarized and finds that primary pollutants including CO and NO decreased,but secondary pollutants i.e.,HONO(mostly generated via secondary process)*** study highlights the requirement to mitigate secondary pollution by control HONO concentration.

关键词： Nitrous acid Field observation winter air pollution

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wintertime N2O5 uptake coefficients over the North China Plain

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Science Bulletin 2020年第9期65卷 765-774,M0004页

作者： Haichao Wang Xiaorui Chen Keding Lu Zhaofeng Tan Xuefei Ma Zhijun Wu Xin Li Yuhan Liu Dongjie Shang Yusheng Wu Limin Zeng Min Hu Sebastian Schmitt Astrid Kiendler-Scharr Andreas Wahner Yuanhang Zhang State Key Joint Laboratory of Environmental Simulation and pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Institute of Energy and Climate Research IEK-8:TroposphereForschungszentrum Jülich GmbHJülich 52428Germany Center for Excellence in Regional Atmospheric Environment Chinese Academy of SciencesXiamen 361021China Institute of Energy and Climate Research IEK-8:TroposphereForschungszentrum Julich GmbHJulich 52428Germany Now at TSI GmbH Aachen 52068Germany

The heterogeneous hydrolysis of dinitrogen pentoxide(N2O5)plays an important role in regulating *** N2O5 uptake coefficient,γ(N2O5),was determined using an iterative box model that was constrained to observational data obtained in suburban Beijing from February to March *** box model determined 2289 individualγ(N2O5)values that varied fromwinterγ(N2O5)values in Beijing were relatively low as compared to values reported in previous field studies conducted during winter in Hong Kong(average value of 0.014)and the eastern ***(median value of 0.0143).In our study,field evidence of the suppression ofγ(N2O5)values due to pNO3-content,organics and the enhancement by aerosol liquid water content(ALWC)is in line with previous laboratory study *** ALWC,high pNO3-content,and particle morphology(inorganic core with an organic shell)accounted for the lowγ(N2O5)values in the North China Plain(NCP)during *** field-derivedγ(N2O5)values are well reproduced by a revised parameterization method,which includes the aerosol size distribution,ALWC,nitrate and organic coating,suggesting the feasibility of comprehensive parameterization in the NCP during wintertime.

关键词： N2O5 uptake coefficient winter air pollution Nighttime chemistry Nitrate pollution

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