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Variations in PM2.5, TSP, BC, and trace gases (NO2, SO2, and O-3) between haze and non-haze episodes in winter over Xi'an, China
Zhang, Qian1,2; Shen, Zhenxing1,2; Cao, Junji2; Zhang, Renjian3; Zhang, Leiming4; Huang, R. -J.2,5,6; Zheng, Chenjia1; Wang, Linqing1; Liu, Suixin2; Xu, Hongmei1; Zheng, Chunli1; Liu, Pingping1

To investigate chemical profiles and formation mechanisms of aerosol particles in winter haze events, daily PM2.5 and TSP, 5-min BC, and 15-min trace gases (SO2, NO2, and O-3) were measured continuously during Dec. 1-31, 2012 in Xi'an. Chemical analysis was also conducted for nine water-soluble inorganic ions (Na+, NH, K+, Mg2+, Ca2+, F-, Cl-, NO3-, and SO42-), organic carbon (OC), elemental carbon (EC), and eight carbon fractions (OC1, OC2, OC3, OC4, EC1, EC2, EC3, and OP) in both PM2.5 and TSP samples. Higher levels of TSP, PM2.5, BC, SO2, and NO2, and lower levels of O-3 were observed during haze periods in comparison with non-haze days. The sum of the major secondary ionic species (Nit, NO3-, and SO42-) in PM2.5 or TSP during haze periods was about 3 times of that during non-haze days. Ion balance calculations showed that PM2.5 samples were acidic during haze periods and were close to neutral during non-haze days. The mean carbon levels were 52.9 mu g m(-3) and 82.1 mu g m(-3) in PM2.5 and TSP, respectively, during haze events, which were similar to 1.5 times of those during non-haze days. The diurnal variations of BC during non-haze days showed a bimodal distribution with two peaks coincided with traffic rush hours. This was not the case during haze periods, which exhibited a relatively smooth pattern but with high concentration levels, providing evidence of particle accumulation. The ratios of SO42-/EC, NO3-/EC, and NH4+/EC sharply increased during haze periods, indicating the important pathway of secondary inorganic species formation through aqueous-phase transformation under high relative humidity condition. This study also highlights that wintertime secondary organic carbon (SOC) formation can be an important contributor to carbonaceous aerosol, especially during haze periods. (C) 2015 Elsevier Ltd. All rights reserved.

KeywordAerosol Formation Inorganic Aerosol Organic Aerosol Secondary Aerosol Urban Environment
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
WOS KeywordOrganic Aerosol Formation ; Fine Particulate Matter ; Urban Site ; Chemical Characteristics ; Northwest China ; United-states ; Seasonal-variations ; Secondary Aerosol ; Boundary-layer ; Inorganic-ions
Indexed BySCI
WOS Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000356190800007
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Document Type期刊论文
Corresponding AuthorShen, Zhenxing
Affiliation1.Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Beijing 100864, Peoples R China
3.Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Res Temperate East A, Beijing 100029, Peoples R China
4.Environm Canada, Air Qual Res Div, Sci & Technol Branch, Toronto, ON, Canada
5.Paul Scherrer Inst, Lab Atmospher Chem, CH-5232 Villigen, Switzerland
6.Natl Univ Ireland Galway, Ryan Inst, Ctr Climate & Air Pollut Studies, Galway, Ireland
Recommended Citation
GB/T 7714
Zhang, Qian,Shen, Zhenxing,Cao, Junji,et al. Variations in PM2.5, TSP, BC, and trace gases (NO2, SO2, and O-3) between haze and non-haze episodes in winter over Xi'an, China[J]. ATMOSPHERIC ENVIRONMENT,2015,112:64-71.
APA Zhang, Qian.,Shen, Zhenxing.,Cao, Junji.,Zhang, Renjian.,Zhang, Leiming.,...&Liu, Pingping.(2015).Variations in PM2.5, TSP, BC, and trace gases (NO2, SO2, and O-3) between haze and non-haze episodes in winter over Xi'an, China.ATMOSPHERIC ENVIRONMENT,112,64-71.
MLA Zhang, Qian,et al."Variations in PM2.5, TSP, BC, and trace gases (NO2, SO2, and O-3) between haze and non-haze episodes in winter over Xi'an, China".ATMOSPHERIC ENVIRONMENT 112(2015):64-71.
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