DOI: 10.1002/2017JD027505
Scopus记录号: 2-s2.0-85040723264
论文题名: Linking Barbados Mineral Dust Aerosols to North African Sources Using Elemental Composition and Radiogenic Sr, Nd, and Pb Isotope Signatures
作者: Bozlaker A. ; Prospero J.M. ; Price J. ; Chellam S.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 2 起始页码: 1384
结束页码: 1400
语种: 英语
英文关键词: Barbados
; dust
; elemental composition
; long-range transport
; radiogenic isotopes
; Sahara-Sahel
Scopus关键词: aerosol
; chemical composition
; concentration (composition)
; dust
; enrichment
; isotopic composition
; lead isotope
; long range transport
; neodymium isotope
; particulate matter
; pollutant source
; radionuclide
; strontium isotope
; Atlantic Ocean
; Barbados
; Bodele
; Caribbean Sea
; Chad
; Sahara
; Sahel [Sub-Saharan Africa]
; United States
英文摘要: Large quantities of African dust are carried across the Atlantic to the Caribbean Basin and southern United States where it plays an important role in the biogeochemistry of soils and waters and in air quality. Dusts' elemental and isotopic composition was comprehensively characterized in Barbados during the summers of 2013 and 2014, the season of maximum dust transport. Although total suspended insoluble particulate matter (TSIP) mass concentrations varied significantly daily and between the two summers, the abundances (μg element/g TSIP) of 50 elements during “high-dust days” (HDD) were similar. Aerosols were regularly enriched in Na, Cu, Zn, As, Se, Mo, Cd, Sn, Sb, and W relative to the upper continental crust. Enrichment of these elements, many of which are anthropogenically emitted, was significantly reduced during HDD, attributed to mixing and dilution with desert dust over source regions. Generally, Ti/Al, Si/Al, Ca/Al, Ti/Fe, Si/Fe, and Ca/Fe ratios during HDD differed from their respective values in hypothesized North African source regions. Nd isotope composition was relatively invariant for “low-dust days” (LDD) and HDD. In contrast, HDD-aerosols were more radiogenic exhibiting higher 87Sr/86Sr, 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios compared to LDD. Generally, Barbados aerosols' composition ranged within narrow limits and was much more homogeneous than that of hypothesized African source soils. Our results suggest that summertime Barbados aerosols are dominated by a mixture of particles originating from sources in the Sahara-Sahel regions. The Bodélé Depression, long suspected as a major source, appears to be an insignificant contributor of summertime western Atlantic dust. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114661
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Civil Engineering, Texas A&M University, College Station, TX, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Air Quality Division, Texas Commission on Environmental Quality, Austin, TX, United States; Department of Chemical Engineering, Texas A&M University, College Station, TX, United States
Recommended Citation:
Bozlaker A.,Prospero J.M.,Price J.,et al. Linking Barbados Mineral Dust Aerosols to North African Sources Using Elemental Composition and Radiogenic Sr, Nd, and Pb Isotope Signatures[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)