Return of naturally sourced Pb to Atlantic surface waters
Return of naturally sourced Pb to Atlantic surface waters
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.
12921
Bridgestock, Luke
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van de Flierdt, Tina
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Rehkämper, Mark
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Paul, Maxence
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Middag, Rob
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Milne, Angela
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Lohan, M.C.
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Baker, Alex R.
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Chance, Rosie
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Khondoker, Roulin
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Strekopytov, Stanislav
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Humphreys-Williams, Emma
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Achterberg, Eric P.
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Rijkenberg, Micha J. A.
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Gerringa, Loes J. A.
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de Baar, Hein J. W.
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28 September 2016
Bridgestock, Luke
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van de Flierdt, Tina
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Rehkämper, Mark
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Paul, Maxence
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Middag, Rob
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Milne, Angela
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Lohan, M.C.
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Baker, Alex R.
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Chance, Rosie
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Khondoker, Roulin
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Strekopytov, Stanislav
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Humphreys-Williams, Emma
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Achterberg, Eric P.
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Rijkenberg, Micha J. A.
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Gerringa, Loes J. A.
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de Baar, Hein J. W.
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Bridgestock, Luke, van de Flierdt, Tina, Rehkämper, Mark, Paul, Maxence, Middag, Rob, Milne, Angela, Lohan, M.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.
Nature Communications, 7, .
(doi:10.1038/ncomms12921).
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.
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ncomms12921.pdf
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Accepted/In Press date: 16 August 2016
e-pub ahead of print date: 28 September 2016
Published date: 28 September 2016
Organisations:
Ocean and Earth Science, Marine Biogeochemistry
Identifiers
Local EPrints ID: 402984
URI: http://eprints.soton.ac.uk/id/eprint/402984
PURE UUID: 927696c7-2b54-476f-b9d6-7cb5ab03f5f4
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Date deposited: 16 Nov 2016 10:52
Last modified: 15 Mar 2024 03:45
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Contributors
Author:
Luke Bridgestock
Author:
Tina van de Flierdt
Author:
Mark Rehkämper
Author:
Maxence Paul
Author:
Rob Middag
Author:
Angela Milne
Author:
Alex R. Baker
Author:
Rosie Chance
Author:
Roulin Khondoker
Author:
Stanislav Strekopytov
Author:
Emma Humphreys-Williams
Author:
Micha J. A. Rijkenberg
Author:
Loes J. A. Gerringa
Author:
Hein J. W. de Baar
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