Arid
DOI10.1002/2017JD027505
Linking Barbados Mineral Dust Aerosols to North African Sources Using Elemental Composition and Radiogenic Sr, Nd, and Pb Isotope Signatures
Bozlaker, Ayse1; Prospero, Joseph M.2; Price, Jim3; Chellam, Shankararaman1,4
通讯作者Chellam, Shankararaman
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2018
卷号123期号:2页码:1384-1400
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 (gelement/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 Sr-87/Sr-86, Pb-206/Pb-204, Pb-207/Pb-204, and Pb-208/Pb-204 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 Bodele Depression, long suspected as a major source, appears to be an insignificant contributor of summertime western Atlantic dust.


英文关键词dust Barbados Sahara-Sahel elemental composition radiogenic isotopes long-range transport
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000425520200045
WOS关键词LONG-RANGE TRANSPORT ; SEA-SALT SULFATE ; SOUTHEASTERN UNITED-STATES ; ATMOSPHERIC TRACE-METALS ; MARINE BOUNDARY-LAYER ; TRADE-WIND AEROSOLS ; SAHARAN DUST ; PARTICULATE MATTER ; DESERT DUST ; CANARY-ISLANDS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/210952
作者单位1.Texas A&M Univ, Dept Civil Engn, College Stn, TX 77843 USA;
2.Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA;
3.Texas Commiss Environm Qual, Air Qual Div, Austin, TX USA;
4.Texas A&M Univ, Dept Chem Engn, College Stn, TX 77843 USA
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Bozlaker, Ayse,Prospero, Joseph M.,Price, Jim,et al. Linking Barbados Mineral Dust Aerosols to North African Sources Using Elemental Composition and Radiogenic Sr, Nd, and Pb Isotope Signatures[J],2018,123(2):1384-1400.
APA Bozlaker, Ayse,Prospero, Joseph M.,Price, Jim,&Chellam, Shankararaman.(2018).Linking Barbados Mineral Dust Aerosols to North African Sources Using Elemental Composition and Radiogenic Sr, Nd, and Pb Isotope Signatures.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(2),1384-1400.
MLA Bozlaker, Ayse,et al."Linking Barbados Mineral Dust Aerosols to North African Sources Using Elemental Composition and Radiogenic Sr, Nd, and Pb Isotope Signatures".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.2(2018):1384-1400.
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