DOI: 10.1016/j.atmosenv.2013.10.021
Scopus记录号: 2-s2.0-84887207667
论文题名: A radiogenic isotope tracer study of transatlantic dust transport from Africa to the Caribbean
作者: Kumar A ; , Abouchami W ; , Galer S ; J ; G ; , Garrison V ; H ; , Williams E ; , Andreae M ; O
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 82 起始页码: 130
结束页码: 143
语种: 英语
英文关键词: Africa
; Caribbean
; Dust
; Long-range transport
; Provenance
; Radiogenic isotope tracers
Scopus关键词: Africa
; Caribbean
; Long range transport
; Provenance
; Radiogenic isotopes
; Atmospheric movements
; Dust
; Isotopes
; Lead
; Silicates
; Strontium
; lead
; neodymium
; silicate
; strontium
; tracer
; anthropogenic source
; atmospheric pollution
; atmospheric transport
; dust
; fractionation
; isotope
; isotopic analysis
; isotopic composition
; long range transport
; provenance
; rainforest
; suspended particulate matter
; Africa
; air sampling
; anion exchange chromatography
; article
; Atlantic Ocean
; Cape Verde
; Central America
; desert
; ion exchange chromatography
; leaching
; Mali
; Mauritania
; mineral dust
; priority journal
; soil
; South America
; suspended particulate matter
; Trinidad and Tobago
; Virgin Islands (U.S.)
; volcanic ash
; Africa
; Caribbean Islands
; Leeward Islands [Lesser Antilles]
; Virgin Islands
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Many studies have suggested that long-range transport of African desert dusts across the Atlantic Ocean occurs, delivering key nutrients and contributing to fertilization of the Amazon rainforest. Here we utilize radiogenic isotope tracers - Sr, Nd and Pb - to derive the provenance, local or remote, and pathways of dust transport from Africa to the Caribbean. Atmospheric total suspended particulate (TSP) matter was collected in 2008 on quartz fibre filters, from both sides of the Atlantic Ocean at three different locations: in Mali (12.6°N, 8.0°W; 555m a.s.l.), Tobago (11.3°N, 60.5°W; 329m a.s.l.) and the U.S. Virgin Islands (17.7°N, 64.6°W; 27m a.s.l.). Both the labile phase, representative of the anthropogenic signal, and the refractory detrital silicate fraction were analysed. Dust deposits and soils from around the sampling sites were measured as well to assess the potential contribution from local sources to the mineral dust collected. The contribution from anthropogenic sources of Pb was predominant in the labile, leachate phase. The overall similarity in Pb isotope signatures found in the leachates is attributed to a common African source of anthropogenic Pb, with minor inputs from other sources, such as from Central and South America. The Pb, Sr and Nd isotopic compositions in the silicate fraction were found to be systematically more radiogenic than those in the corresponding labile phases. In contrast, Nd and Sr isotopic compositions from Mali, Tobago, and the Virgin Islands are virtually identical in both leachates and residues. Comparison with existing literature data on Saharan and Sahelian sources constrains the origin of summer dust transported to the Caribbean to mainly originate from the Sahel region, with some contribution from northern Saharan sources. The source regions derived from the isotope data are consistent with 7-day back-trajectory analyses, demonstrating the usefulness of radiogenic isotopes in tracing dust provenance and atmospheric transport. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81126
Appears in Collections: 气候变化事实与影响
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作者单位: Max Planck Institute for Chemistry, P.O. Box 3060, 55020 Mainz, Germany; Institut für Mineralogie, WWU Münster, Corrensstraße 24, 48149 Münster, Germany; U.S. Geological Survey, St. Petersburg, FL 33701, United States; Massachusetts Institute of Technology, Cambridge, MA 02139-4307, United States
Recommended Citation:
Kumar A,, Abouchami W,, Galer S,et al. A radiogenic isotope tracer study of transatlantic dust transport from Africa to the Caribbean[J]. Atmospheric Environment,2014-01-01,82