Return of naturally sourced Pb to Atlantic surface waters.

Bridgestock, Luke, van de Flierdt, Tina, Rehkämper, Mark, Paul, Maxence, Middag, Rob, Milne, Angela, Lohan, Maeve C., Baker, Alex R., Chance, Rosie, Khondoker, Roulin, Strekopytov, Stanislav, Humphreys-Williams, Emma, Achterberg, Eric P. , Rijkenberg, Micha J. A., Gerringa, Loes J. A. and de Baar, Hein J. W. (2016) Return of naturally sourced Pb to Atlantic surface waters. Open Access Nature Communications, 7 (12921). DOI 10.1038/ncomms12921.

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Abstract

Anthropogenic emissions completely overwhelmed natural marine lead (Pb) sources during the past century, predominantly due to leaded petrol usage. Here, based on Pb isotope measurements, we reassess the importance of natural and anthropogenic Pb sources to the tropical North Atlantic following the nearly complete global cessation of leaded petrol use. Significant proportions of up to 30–50% of natural Pb, derived from mineral dust, are observed in Atlantic surface waters, reflecting the success of the global effort to reduce anthropogenic Pb emissions. The observation of mineral dust derived Pb in surface waters is governed by the elevated atmospheric mineral dust concentration of the North African dust plume and the dominance of dry deposition for the atmospheric aerosol flux to surface waters. Given these specific regional conditions, emissions from anthropogenic activities will remain the dominant global marine Pb source, even in the absence of leaded petrol combustion.

Document Type: Article
Additional Information: WOS:000385386800005
Keywords: RRS Discovery, D361 cruise, RV Pelagia, 64PE321 cruise, naturally sourced Pb, Atlantic surface waters
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/ncomms12921
ISSN: 2041-1723
Projects: GEOTRACES, Future Ocean
Date Deposited: 14 Oct 2016 08:38
Last Modified: 01 Feb 2019 15:12
URI: http://oceanrep.geomar.de/id/eprint/34340

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