Return of naturally sourced Pb to Atlantic surface waters

Bridgestock, Luke and van de Flierdt, Tina and Rehkamper, Mark and Paul, Maxence and Middag, Rob and Milne, Angela and Lohan, Maeve C. and Baker, Alex R. and Chance, Rosie and Khondoker, Roulin and Strekopytov, Stanislav and Humphreys-Williams, Emma and Achterberg, Eric P. and Rijkenberg, Micha J. A. and Gerringa, Loes J. A. and de Baar, Hein J. W. (2016) Return of naturally sourced Pb to Atlantic surface waters. Nature Communications, 7. ISSN 2041-1723 DOI https://doi.org/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.

Item Type: Article
Uncontrolled Keywords: NILAREP
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Nature Communications
Volume: 7
Identification Number: https://doi.org/10.1038/ncomms12921
Depositing User: Sarah Humbert
Date Deposited: 05 Nov 2020 17:08
Last Modified: 24 Nov 2020 19:09
URI: http://eprints.esc.cam.ac.uk/id/eprint/4910

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