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Single particle characterization of summertime particles in Xi'an (China)
Chen, Y (Chen, Yang)[ 1,2 ]; Liu, HW (Liu, Huanwu)[ 3 ]; Yang, FM (Yang, Fumo)[ 4,5 ]; Zhang, SM (Zhang, Shumin)[ 6 ]; Li, WT (Li, Wentao)[ 3 ]; Shi, GM (Shi, Guangming)[ 1,4 ]; Wang, HB (Wang, Huanbo)[ 1 ]; Tian, M (Tian, Mi)[ 1 ]; Liu, SX (Liu, Suixin)[ 2 ]; Huang, RJ (Huang, Rujin)[ 2 ]; Wang, QY (Wang, Qiyuan)[ 2 ]; Wang, P (Wang, Ping)[ 2 ]; Cao, JJ (Cao, Junji)[ 2,7 ]
Source PublicationScience of the Total Environment

Urban particles in Xi'an during summertime were investigated using a single particle aerosol mass spectrometer (SPAMS). Twelve major particle types were resolved, including EC-Sul-Nit (-Sul stands for sulfate, -Nit for nitrate, and 25% in number fraction), EC(6%), EC-Nit (12%) and, EC-Sul (8%), mixed Elemental and Organic Carbon-Sul-Nit (9%), ECOC-Sul (8%), K-Nit (12%), OC (8%), NaK-Nit (5%), Fe-Nit (5%), Ca-Nit (1%), and Other (1%). Among these particle types, chemical composition, mixing state, and wind-dependent analyses were conducted to investigate their originations and sources. During summertime, traffic-related particles were up to 83% in the SPAMS dataset. Two major originations of urban particles were identified, including the local aging and short-distance transport mainly from the southeast. Size-resolved relative acidity ((sulfate + nitrate) / ammonium) analysis suggested that urban particles were more acidic with an aerodynamic diameter < 0.8 μm. In diurnal cycle, the strongest relative aerosol acidity occurred between 7:00 and 9:00 in the morning when relative humidity was between 60 and 70%, and the weakest acidity occurred from 13:00–15:00. Among all major particle types, OC and K-Nit had stronger relative aerosol acidity than other types. Mixing state analysis indicated that the organic semi-volatile vapor is favorable to condense on the OC-related particles (OC, ECOC-Sul, and ECOC-Sul-Nit) as evidence that primary organic aerosol (POA) would enhance the secondary organic aerosol (SOA) formation via gas-to-particle phase partitioning when SOA and POA are miscible. Oxalate also tends to be observed in the droplet of OC-related particles. In addition, the enrichment of oxalate was observed in Fe-Nit particles. This study would be useful to understand the characterization, mixing state, source, origination, and processing of urban particles during summertime in Xi'an as well as the urban areas in the Guanzhong Basin.

KeywordSpams Mixing State Aerosol Acidity Source Origination
Indexed BySCI
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYang, FM (Yang, Fumo)[ 4,5 ]; Cao, JJ (Cao, Junji)[ 2,7 ]
Affiliation1.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
2.Key Lab of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China;
3.Xi'an Environmental Monitor Station, Xi'an 710061, China;
4.College of Architecture and Environment, Sichuan University, Chengdu 610065, China;
5.Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;
6.School of Basic Medical Sciences, North Sichuan Medical College, Nanchong 637000, Sichuan, China;
7.Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
Recommended Citation
GB/T 7714
Chen, Y ,Liu, HW ,Yang, FM ,et al. Single particle characterization of summertime particles in Xi'an (China)[J]. Science of the Total Environment,2018,636:1279-1290.
APA Chen, Y .,Liu, HW .,Yang, FM .,Zhang, SM .,Li, WT .,...&Cao, JJ .(2018).Single particle characterization of summertime particles in Xi'an (China).Science of the Total Environment,636,1279-1290.
MLA Chen, Y ,et al."Single particle characterization of summertime particles in Xi'an (China)".Science of the Total Environment 636(2018):1279-1290.
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