Growth of nitrate contribution to aerosol pollution during wintertime in Xi'an,northwest China:Formation mechanism and effects of NH_(3)
作者机构：State Key Laboratory of Loess and Quaternary Geology.Key Laboratory ofAerosol Chemistry and PlhysicsInstitute of Earth EnvironmentChinese Acadery of SciencesXi'an 710061China Xi'an Institute for Innovative Earth Environment ResearchXi'an 710061China National pbservation and Research Station of Regional Ecological Environment Change and Cornprehensive Management in the Guanzhong PlainXi'an 710061China Shaanxi Key Laboratory of Atmospheric and Haze fog Pollution PreventionInstitute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Environmental EngineeringJiangsu University of TechnologyChangzhou 213001China Division of Atmospheric SciencesDesert Research InstituteReno NV89512United States Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2024年第87卷第4期
页 面：303-315页
核心收录：
学科分类：07[理学] 0817[工学-化学工程与技术] 070602[理学-大气物理学与大气环境] 0805[工学-材料科学与工程（可授工学、理学学位）] 0706[理学-大气科学]
基 金：supported by the West Light Foundation of the Chinese Academy of Sciences (grant No.XAB2021YN05) the National Natural Science Foundation of China (grant No.41503123) the National Atmospheric Research Program (grant No.2017YFC0212200)
主 题：PM_(2.5) Water-soluble inorganic ions Nitrate formation Excess ammonium Vehicle restrictions
摘 要：With the strengthened controls on SO2 emissions and extensive increases in motor vehicles exhaust,aerosol pollution shifts from sulfate-rich to nitrate-rich in recent years in Xi an,*** further gain insights into the factors on nitrate formation and efficiently mitigate air pollution,highly time-resolved observations of water-soluble inorganic ions(WSIIs)in PM_(2.5) were measured in a suburban area of Xi an,China during *** concentration of total WSIIs is 39.8μg m-3 on average,accounting for 50.3%of PM_(2.5) *** contrast to a slight decrease in the mass fraction of SO_(4)^(2-),NO_(3)-shows a sig-nificant increase of the PM_(2.5) contribution with the aggravation of aerosol *** suggests the importance of NO_(3)-formation to haze ***,homogeneous reactions govern the formation of NO_(3)-,while alkali metals such as calcium and sodium play an additional role in retaining NO_(3)-in PM_(2.5) during clean ***,the heterogeneous hydrolysis reaction contributed more to NO_(3)-formation during the pollution periods under high relative *** investigation reveals that temperature,relative humidity,oxidant,and ammonia emissions facilitate rapid NO_(3)-*** the random forest(RF)model,NO_(3)-concentrations were successfully simulated with measured variables for the training and testing datasets(R20.95).Among these variables,CO,NH_(3),and NO_(2) were found to be the main factors affecting the NO_(3)-*** with the period without vehicle re-striction,the contributions of NO_(3)-and NH4+to PM_(2.5) mass decreased by 5.3%and 3.4%in traffic re-striction periods,*** vehicle restriction leads to the decreases of precursor gases of NO_(2),SO_(2),and NH_(3) by 12.8%,5.9%,and 27.6%,*** results demonstrate collaborative emission reduction of NO_(x) and NH_(3) by vehicle restrictions,and using new energy vehicles(or electric vehicles)can effectively alleviate particul
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