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Chemical composition and size distribution of wintertime aerosols in the atmosphere of Mt. Hua in central China
Li,JJ (Li, Jianjun)[1,2]; Wang,GH (Wang, Gehui)[2,1]; Zhou,BH (Zhou, Bianhong)[2,3]; Cheng,CL (Cheng, Chunlei)[2]; Cao,JJ (Cao, Junji)[2,1]; Shen,ZX (Shen, Zhenxing)[1]; An,ZS (An, Zhisheng)[1,2]
2011-02-28
Source PublicationATMOSPHERIC ENVIRONMENT
Volume45Issue:6Pages:1251-1258
Subtype期刊论文
Abstract

TSP, PM(10) and size-segregated aerosols were collected at the summit (2060 m, a.s.l.) of Mt. Hua in central China during the winter of 2009, and determined for organic (OC) and elemental carbon (EC), pH of water-extracts and inorganic ions. OC in TSP and PM(10) are 6.9 +/- 2.9 and 5.9 +/- 2.5 mu g m(-3), while EC in TSP and PM(10) are 0.9 +/- 0.6 and 0.9 +/- 0.5 mu g m(-3), respectively. SO(4)(2-), NO(3)(-), NH(4)(+) and Ca(2)(+) are major ions in PM(10) with concentrations of 5.8 +/- 3.7, 2.7 +/- 1.6, 1.6 +/- 0.9 and 1.5 +/- 0.7 mu g m(-3), respectively. OC/EC ratios (8.2 +/- 3.1 in TSP and 6.6 +/- 1.8 in PM(10)) at the mountaintop are 2-4 times higher than those in lowland surface, suggesting an enhanced transformation of organics from gas- to solid- phase because of an increased photochemical oxidation and/or an increased condensation due to lower temperature, as well as an increased organic input from mountain plant emission. Air mass backward trajectories showed that compared with those derived from north/northwest China aerosols transported from the south contained higher concentrations of SO(4)(2-) and NH(4)(+) and lower concentrations of Ca(2+). Size distributions of NH(4)(+) and K(+) presented as an accumulation mode with a peak at 0.7-1.1 mu m, in contrast to Ca(2+) and Mg(2+), which maximized at the size 4.7-5.8 mu m as a coarse mode. SO(4)(2-) and NO(3)(-) showed a bimodal pattern with a large peak at the range 0.7-1.1 mu m and a small peak at the size of 4.7-5.8 mu m, whereas Na(+) and Cl(-) displayed a bimodal pattern with two equivalent peaks in the fine (< 2.1 mu m) and coarse (>= 2.1 mu m) ranges. pH values of the water-extracts demonstrate that aerosols originate from southern China are more acidic than those from the north/northwest, and the particles with a diameter of 0.7-11 mu m are most acidic.

KeywordMountain Aerosols Organic And Elemental Carbon Inorganic Ions Size Distribution Sources
DOI10.1016/j.atmosenv.2010.12.009
Indexed BySCI
Language英语
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10250
Collection粉尘与环境研究室
Corresponding AuthorWang,GH (Wang, Gehui)[2,1]
Affiliation1.Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
2.State Key Laboratory of Loess and Quatemary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;
3.Department of Geographical Science and Environment Engineering, Baoji University of Art and Science, Baoji 721013, China
Recommended Citation
GB/T 7714
Li,JJ ,Wang,GH ,Zhou,BH ,et al. Chemical composition and size distribution of wintertime aerosols in the atmosphere of Mt. Hua in central China[J]. ATMOSPHERIC ENVIRONMENT,2011,45(6):1251-1258.
APA Li,JJ .,Wang,GH .,Zhou,BH .,Cheng,CL .,Cao,JJ .,...&An,ZS .(2011).Chemical composition and size distribution of wintertime aerosols in the atmosphere of Mt. Hua in central China.ATMOSPHERIC ENVIRONMENT,45(6),1251-1258.
MLA Li,JJ ,et al."Chemical composition and size distribution of wintertime aerosols in the atmosphere of Mt. Hua in central China".ATMOSPHERIC ENVIRONMENT 45.6(2011):1251-1258.
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