干旱区生态环境知识资源中心(Arid): Atmospheric deposition across the Atacama Desert, Chile: Compositions, source distributions, and interannual comparisons

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DOI	10.1016/j.chemgeo.2019.07.037
	Atmospheric deposition across the Atacama Desert, Chile: Compositions, source distributions, and interannual comparisons
	Li, Jianghanyang 1; Wang, Fan 2,3; Michalski, Greg 1,4; Wilkins, Benjamin 4
通讯作者	Wang, Fan
来源期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
EISSN	1872-6836
出版年	2019
卷号	525 页码:435-446
英文摘要	Hyper-arid areas such as the Atacama Desert accumulated significant amounts of insoluble dust and soluble salts from the atmosphere, providing minable salt deposits as well as mimicking the surface processes on Mars. The deposition rates, compositions and sources, however, were poorly constrained. Especially, the variabilities of atmospheric deposition in the Atacama Desert corresponding to a changing climate were unassessed. In this work, the atmospheric depositions collected using dust traps across a west-east elevation gradient in the Atacama (similar to 23 degrees S) from 1/2/2010 to 12/31/2011 were analyzed and compared to previous results in 2007-2009. The insoluble dust deposition rates in our sampling period were significantly higher than those of 2007-2009 in most dust traps, which was attributed to the changes in wind, highlighting the importance of long-term monitoring of insoluble dust fluxes. Soluble salts, instead, showed less distinct interannual variations in deposition rates, geochemical compositions or source contributions. At the coastal site (T1), soluble salts were originated from both primary sea-salt (SS) aerosols and non-sea-salt (NSS) sources such as anthropogenic emission, marine biogenic emission and biomass burning; the deposition rates of these salts largely depended on the wind speed and the amount of anthropogenic emissions. Sulfur isotopic evidence further showed that NSS sulfate at T1 was mainly originated from local SO2 emission from local power plants. The inland sites (T2-T8) displayed much lower soluble salts deposition rates, and the salts were primarily sourced from entrainment of local surface minerals, including Na(Cl, NO3), CaSO4, and nitrate formed via atmospheric oxidation of anthropogenic NOx. Sulfur isotopic compositions of sulfate deposited at T2-T8 were similar to those in local surface soil; however, three sites near the Chuquicamata mine showed slightly lower delta S-34(sulfate) values, indicating the presence of secondary sulfate originated from mining activities. The soluble salts deposited at the Andean site (T10) were dominantly from wet deposition that incorporated local lake salts, and therefore, the deposition rates were mainly controlled by the amount of precipitation.
英文关键词	Atacama Desert Atmospheric deposition Interannual comparison Sulfur isotopes
类型	Article
语种	英语
国家	USA ; Peoples R China
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000501715700032
WOS关键词	SEA-SALT PARTICLES ; SULFUR ISOTOPIC COMPOSITION ; MARINE AEROSOL PRODUCTION ; DUST DEPOSITION ; DRY DEPOSITION ; SULFATE SOURCES ; SOUTHERN-OCEAN ; NORTHERN CHILE ; SOIL FORMATION ; SPRAY AEROSOL
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
EI主题词	2019-10-20
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310316
作者单位	1.Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA; 2.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Sch Atmospher Sci, Zhuhai 519082, Peoples R China; 3.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China; 4.Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA
推荐引用方式 GB/T 7714	Li, Jianghanyang,Wang, Fan,Michalski, Greg,et al. Atmospheric deposition across the Atacama Desert, Chile: Compositions, source distributions, and interannual comparisons[J],2019,525:435-446.
APA	Li, Jianghanyang,Wang, Fan,Michalski, Greg,&Wilkins, Benjamin.(2019).Atmospheric deposition across the Atacama Desert, Chile: Compositions, source distributions, and interannual comparisons.CHEMICAL GEOLOGY,525,435-446.
MLA	Li, Jianghanyang,et al."Atmospheric deposition across the Atacama Desert, Chile: Compositions, source distributions, and interannual comparisons".CHEMICAL GEOLOGY 525(2019):435-446.