Formation mechanisms of nitrous acid(HONO) during the haze and non-haze periods in Beijing,China  

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作  者:Deng Lin Shengrui Tong Wenqian Zhang Weiran Li Fangjie Li Chenhui Jia Gen Zhang Meifang Chen Xinran Zhang Zhen Wang Maofa Ge Xiang He 

机构地区:[1]Key Laboratory of Oasis Ecology,College of Resource and Environment Sciences,Xinjiang University,Urumqi 830046,China [2]State Key Laboratory for Structural Chemistry of Unstable and Stable Species,Chinese Academy of Sciences Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry Chinese Academy of Sciences,Beijing 100190,China [3]Center for Excellence in Regional Atmospheric Environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]College of Chemistry,Liaoning University,Shenyang 110036,Liaoning,China [6]State Key Laboratory of Severe Weather&Key Laboratory for Atmospheric Chemistry of CMA,Institute of Atmospheric Composition,Chinese Academy of Meteorological Sciences,Beijing 100081,China [7]College of Chemistry and Material Science,Anhui Normal University,Wuhu 241000,China

出  处:《Journal of Environmental Sciences》2022年第4期343-353,共11页环境科学学报(英文版)

基  金:supported by the National Natural Science Foundation of China(Nos.41830106,22006124);Beijing National Laboratory for Molecular Sciences(No.BNLMS-CXXM-202011);the Youth Innovation Promotion Association CAS(No.2017042)

摘  要:As an important precursor of hydroxyl radical(OH),nitrous acid(HONO)plays a significant role in atmospheric chemistry.Here,an observation of HONO and relevant air pollutants in an urban site of Beijing from 14 to 28 April,2017 was performed.Two distinct peaks of HONO concentrations occurred during the observation.In contrast,the concentration of particulate matter in the first period(periodⅠ)was significantly higher than that in the second period(periodⅡ).Comparing to HONO sources in the two periods,we found that the direct vehicle emissionwas an essential source of the ambient HONO during both periods at night,especially in periodⅡ.The heterogeneous reaction of NO_(2)was the dominant source in periodⅠ,while the homogeneous reaction of NO with OH was more critical source at night in periodⅡ.In the daytime,the heterogeneous reaction of NO_(2)was a significant source andwas confirmed by the good correlation coefficients(R^(2))between the unknown sources(P_(unknown))with NO_(2),PM_(2.5),NO_(2)×PM_(2.5)in periodⅠ.Moreover,when solar radiation and OH radicals were considered to explore unknown sources in the daytime,the enhanced correlation of P_(unknown)with photolysis rate of NO_(2)and OH(J_(NO_(2))×OH)were 0.93 in periodⅠ,0.95 in periodⅡ.These excellent correlation coefficients suggested that the unknown sources released HONO highly related to the solar radiation and the variation of OH radicals.

关 键 词:Nitrous acid(HONO) SOURCE Formation mechanisms OH radicals 

分 类 号:X51[环境科学与工程—环境工程]

 

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