Aerosols chemical composition, light extinction, and source apportionment near a desert margin city, Yulin, China

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yali Lei
  • Zhenxing Shen
  • Zhuoyue Tang
  • Qian Zhang
  • Jian Sun
  • Yongjing Ma
  • Xiaoyan Wu
  • Hongmei Xu
  • Renjian Zhang

Detail(s)

Original languageEnglish
Article numbere8447
Journal / PublicationPeerJ
Volume8
Online published14 Feb 2020
Publication statusPublished - 2020
Externally publishedYes

Link(s)

Abstract

Daily PM10 and PM2.5 sampling was conducted during four seasons from December 2013 to October 2014 at three monitoring sites over Yulin, a desert margin city. PM10 and PM2.5 levels, water soluble ions, organic carbon (OC), and elemental carbon (EC) were also analyzed to characterize their chemical profiles. bext (light extinction coefficient) was calculated, which showed the highest in winter with an average of 232.95 ± 154.88 Mm−1, followed by autumn, summer, spring. Light extinction source apportionment results investigated (NH4)2SO4 and NH4NO3 played key roles in the light extinction under high RH conditions during summer and winter. Sulfate, nitrate and Ca2+ dominated in PM10/PM2.5 ions. Ion balance results illustrated that PM samples were alkaline, and PM10 samples were more alkaline than PM2.5. High SO42−/K+ and Cl/K+ ratio indicated the important contribution of coal combustion, which was consistent with the OC/EC regression equation intercepts results. Principal component analysis (PCA) analyses results showed that the fugitive dust was the most major source of PM, followed by coal combustion & gasoline vehicle emissions, secondary formation and diesel vehicle emissions. Potential contribution source function (PSCF) results suggested that local emissions, as well as certain regional transport from northwesterly and southerly areas contributed to PM2.5 loadings during the whole year. Local government should take some measures to reduce the PM levels. © 2020 Lei et al.

Research Area(s)

  • Chemical species, Light extinction, PM10/PM2.5, Potential contribution source function, Principal component analysis, Yulin

Citation Format(s)

Aerosols chemical composition, light extinction, and source apportionment near a desert margin city, Yulin, China. / Lei, Yali; Shen, Zhenxing; Tang, Zhuoyue et al.
In: PeerJ, Vol. 8, e8447, 2020.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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