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Return of naturally sourced Pb to Atlantic surface waters

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Title: Return of naturally sourced Pb to Atlantic surface waters
Authors: Bridgestock, L
Van de Flierdt, T
Rehkamper, M
Paul, M
Middag, R
Milne, A
Lohan, MC
Baker, AR
Chance, R
Khondoker, R
Strekopytov, S
Humphreys-Williams., E
Achterberg, EP
Rijkenberg, MJA
Gerringa, LJA
De Baar, HJW
Item Type: Journal Article
Abstract: Anthropogenic emissions completely overwhelmed natural marine 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. For the first time, 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.
Issue Date: 28-Sep-2016
Date of Acceptance: 22-Jul-2016
URI: http://hdl.handle.net/10044/1/37483
DOI: https://dx.doi.org/10.1038/ncomms12921
ISSN: 2041-1723
Publisher: Nature Publishing Group
Journal / Book Title: Nature Communications
Volume: 7
Copyright Statement: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ © The Author(s) 2016
Sponsor/Funder: Natural Environment Research Council (NERC)
Natural Environment Research Council (NERC)
Funder's Grant Number: NE/H005390/1
NE/J021636/1
Keywords: MD Multidisciplinary
Publication Status: Published
Article Number: 12921
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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