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Size-Differentiated Chemical Characteristics of Asian Paleo Dust: Records from Aeolian Deposition on Chinese Loess Plateau
Wu,F(Wu, Feng)[1]; Chow,JC (Chow, Judith C.)[1,2]; An,ZS (An, Zhisheng)[1]; Watson,JG (Watson, John G.)[1,2]; Cao,JJ (Cao, Junji)[1]
2011-02-28
Source PublicationJOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
Volume61Issue:2Pages:180-189
Subtype期刊论文
Abstract

The Chinese Loess Plateau (CLP) receives and potentially contributes to Asian dust storms that affect particulate matter (PM) concentrations, visibility, and climate. Loess on the CLP has experienced little weathering effect and is regarded as an ideal record to represent geochemical characteristics of Asian paleo dust. Samples were taken from 2-, 9-, and 15-m depths (representing deposition periods from similar to 12,000 to similar to 200,000 yr ago) in the Xi Feng loess profile on the CLP. The samples were resuspended and then sampled through total suspended particulates (TSP), PM(10), PM(2.5), and PM(1) (PM with aerodynamic diameters < similar to 30, 10, 2.5, and 1 mu m, respectively) inlets onto filters for mass, elemental, ionic, and carbon analyses using a Desert Research Institute resuspension chamber. The elements Si, Ca, Al, Fe, K, Mg, water-soluble Ca (Ca(2+)), organic carbon, and carbonate carbon are the major constituents (>1%) in loess among the four PM fractions (i.e., TSP, PM(10), PM(2.5), and PM(1)). Much of Ca is water soluble and corresponds with measures of carbonate, indicating that most of the calcium is in the form of calcium carbonate rather than other calcium minerals. Most of the K is insoluble, indicating that loess can be separated from biomass burning contributions when K(+) is measured. The loess has elemental abundances similar to those of the upper continental crust (UCC) for Mg, Fe, Ti, Mn, V, Cr, and Ni, but substantially different ratios for other elements such as Ca, Co, Cu, As, and Pb. These suggest that the use of UCC as a reference to represent pure or paleo Asian dust needs to be further evaluated. The aerosol samples from the source regions have similar ratios to loess for crustal elements, but substantially different ratios for species from anthropogenic sources (e.g., K, P, V, Cr, Cu, Zn, Ni, and Pb), indicating that the aerosol samples from the geological-source-dominated environment are not a "pure" soil product as compared with loess.

DOI10.3155/1047-3289.61.2.180
Indexed BySCI
Language英语
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10272
Collection粉尘与环境研究室
Corresponding AuthorWu,F(Wu, Feng)[1]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, ChineseAcademy of Sciences, Xi’an, People’s Republic of China;
2.Division of Atmospheric Sciences,Desert Research Institute, Reno, NV
Recommended Citation
GB/T 7714
Wu,F,Chow,JC ,An,ZS ,et al. Size-Differentiated Chemical Characteristics of Asian Paleo Dust: Records from Aeolian Deposition on Chinese Loess Plateau[J]. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION,2011,61(2):180-189.
APA Wu,F,Chow,JC ,An,ZS ,Watson,JG ,&Cao,JJ .(2011).Size-Differentiated Chemical Characteristics of Asian Paleo Dust: Records from Aeolian Deposition on Chinese Loess Plateau.JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION,61(2),180-189.
MLA Wu,F,et al."Size-Differentiated Chemical Characteristics of Asian Paleo Dust: Records from Aeolian Deposition on Chinese Loess Plateau".JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION 61.2(2011):180-189.
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