Variability in sources and concentrations of saharan dust phosphorus over the Atlantic Ocean

A. Gross*, T. Goren, C. Pio, J. Cardoso, O. Tirosh, M. C. Todd, D. Rosenfeld, T. Weiner, D. Custódio, A. Angert

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Saharan dust that is transported over the Atlantic Ocean provides an important input of phosphorus (P) to the oligotrophic waters of ocean and the P-depleted rain forests of America. To establish more firmly the role of Saharan dust events as P suppliers, the dust P sources needs to be identified. From analysis of phosphate oxygen isotopes of all the major Saharan dust events of 2011 over the Cape Verde islands in the northeastern Atlantic, supported by remote-sensing imagery, we infer that the dust P originates from widespread sedimentary sources and magmatic P "hot spots", in which the latter enrich the dust in bioavailable P. The fraction contributed from each source varied markedly between dust events. We also found that phosphate from the Bodélé depression is not evident in Cape Verde. Our results provide new information for global biogeochemical studies and suggest that identification of Saharan dust P sources is required to improve their accuracy.

Original languageAmerican English
Pages (from-to)31-37
Number of pages7
JournalEnvironmental Science and Technology Letters
Volume2
Issue number2
DOIs
StatePublished - 10 Feb 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

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