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Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China
Zhang, T.1,2; Shen, Z. X.3; Su, H.2,4; Liu, S. X.1,2; Zhou, J. M.1,2; Zhao, Z. Z.5; Wang, Q. Y.1,2; Prevot, A. S. H.6; Cao, J. J.1,2,3
Corresponding AuthorZhang, T.(zhangting@ieecas.cn) ; Cao, J. J.(cao@loess.llqg.ac.cn)
2021-05-01
Source PublicationATMOSPHERIC ENVIRONMENT
ISSN1352-2310
Volume252Pages:11
AbstractSulfate, nitrate and ammonium are the most abundant secondary inorganic aerosols (SIA) in atmospheric fine particle matter (PM2.5). Meteorological conditions, gas-particle transportation process, and aerosol acidity (pH) can influence SIA formation. In this study, we conducted semi-continuous measurements of water-soluble inorganic ions during a winter extreme pollution event (from January 9th to January 17th, 2015, average PM2.5 concentrations of similar to 250 mu g m(-3) and peak concentrations of similar to 700 mu g m(-3)) in Xi'an to elucidate on the SIA formation mechanism. The hourly mean level of the total water-soluble ion was 137.4 mu g m(-3), accounting for 55.3% of PM2.5 on average. The dominant ions concentrations of SO42-, NO3- and NH4+ accounted for 15.8%, 19.0% and 13.2% of PM2.5 mass, respectively. PM2.5 was moderately acidic, with an average pH of 4.8 +/- 0.4. Compared to the clean periods, sulfate content decreased by 6.9% during the polluted periods, while those of nitrate and ammonium increased by 2.2% and 5.0%, respectively. The increase in nitrogen oxidation ratios (NOR) and ammonia conversion ratio (NHR) from normal days to haze days were greater when comparison to sulfur oxidation ratios (SOR). In the polluted periods, sulfate and nitrate formations were facilitated by water content increase. Strong linear correlation coefficients between SOR (R-2 = 0.81) and NOR (R-2 = 0.55) with aerosol water content indicated that the gas-liquid reaction of SO2 and NO2 is the major pathway of sulfate and nitrate formation during severe haze episodes. In contrast, the NHR and aerosol water content exhibited a logarithmic relationship, which reveals that when water content was greater than 100 mu g m(-3), the gas-particle partitioning ratio of ammonium was basically unchanged following an increase in water content.
KeywordWater-soluble ions Aerosol water content Sulfate Nitrate Ammonia
DOI10.1016/j.atmosenv.2021.118304
WOS KeywordFINE PARTICULATE MATTER ; CHEMICAL-COMPOSITION ; SEASONAL-VARIATIONS ; HAZE EVENTS ; ATMOSPHERIC AMMONIA ; NITRATE FORMATION ; GUANZHONG PLAIN ; NORTHERN CHINA ; ION CHEMISTRY ; TAIPEI BASIN
Indexed BySCI ; SCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41503123] ; National Natural Science Foundation of China[21661132005] ; National Atmospheric Research Program[2017YFC0212200] ; Key Projects of CAS[ZDRWZS-2017-6] ; National Research Program for Key Issues in Air Pollution Control[DQGG0105] ; Key Research and Development Program of Shaanxi Province[2018-ZDXM3-01] ; SINOSWISS project[IZLCZ2-169986]
WOS Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
Funding OrganizationNational Natural Science Foundation of China ; National Atmospheric Research Program ; Key Projects of CAS ; National Research Program for Key Issues in Air Pollution Control ; Key Research and Development Program of Shaanxi Province ; SINOSWISS project
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000640897900004
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/16401
Collection粉尘与环境研究室
Corresponding AuthorZhang, T.; Cao, J. J.
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol SKLLQG, Xian 710061, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys KLACP, Xian 710061, Peoples R China
3.Xi An Jiao Tong Univ, Dept Environm Engn, Xian 710049, Peoples R China
4.Xian Inst Innovat Earth Environm Res, Xian 710061, Peoples R China
5.Jiangsu Univ Technol, Sch Chem & Environm Engn, Changzhou 213001, Peoples R China
6.Paul Scherrer Inst, Lab Atmospher Chem, Forschungsstr 111, CH-5232 Villigen, Switzerland
Recommended Citation
GB/T 7714
Zhang, T.,Shen, Z. X.,Su, H.,et al. Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China[J]. ATMOSPHERIC ENVIRONMENT,2021,252:11.
APA Zhang, T..,Shen, Z. X..,Su, H..,Liu, S. X..,Zhou, J. M..,...&Cao, J. J..(2021).Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China.ATMOSPHERIC ENVIRONMENT,252,11.
MLA Zhang, T.,et al."Effects of Aerosol Water Content on the formation of secondary inorganic aerosol during a Winter Heavy PM2.5 Pollution Episode in Xi'an, China".ATMOSPHERIC ENVIRONMENT 252(2021):11.
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