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Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes

Atmospheric dust is an important source of the micronutrient Fe to the oceans. Although relatively insoluble mineral Fe is assumed to be the most important component of dust, a relatively small yet highly soluble anthropogenic component may also be significant. However, quantifying the importance of...

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Autores principales: Conway, Tim M., Hamilton, Douglas S., Shelley, Rachel U., Aguilar-Islas, Ana M., Landing, William M., Mahowald, Natalie M., John, Seth G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6570766/
https://www.ncbi.nlm.nih.gov/pubmed/31201307
http://dx.doi.org/10.1038/s41467-019-10457-w
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author Conway, Tim M.
Hamilton, Douglas S.
Shelley, Rachel U.
Aguilar-Islas, Ana M.
Landing, William M.
Mahowald, Natalie M.
John, Seth G.
author_facet Conway, Tim M.
Hamilton, Douglas S.
Shelley, Rachel U.
Aguilar-Islas, Ana M.
Landing, William M.
Mahowald, Natalie M.
John, Seth G.
author_sort Conway, Tim M.
collection PubMed
description Atmospheric dust is an important source of the micronutrient Fe to the oceans. Although relatively insoluble mineral Fe is assumed to be the most important component of dust, a relatively small yet highly soluble anthropogenic component may also be significant. However, quantifying the importance of anthropogenic Fe to the global oceans requires a tracer which can be used to identify and constrain anthropogenic aerosols in situ. Here, we present Fe isotope (δ(56)Fe) data from North Atlantic aerosol samples from the GEOTRACES GA03 section. While soluble aerosol samples collected near the Sahara have near-crustal δ(56)Fe, soluble aerosols from near North America and Europe instead have remarkably fractionated δ(56)Fe values (as light as −1.6‰). Here, we use these observations to fingerprint anthropogenic combustion sources, and to refine aerosol deposition modeling. We show that soluble anthropogenic aerosol Fe flux to the global surface oceans is highly likely to be underestimated, even in the dusty North Atlantic.
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spelling pubmed-65707662019-06-24 Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes Conway, Tim M. Hamilton, Douglas S. Shelley, Rachel U. Aguilar-Islas, Ana M. Landing, William M. Mahowald, Natalie M. John, Seth G. Nat Commun Article Atmospheric dust is an important source of the micronutrient Fe to the oceans. Although relatively insoluble mineral Fe is assumed to be the most important component of dust, a relatively small yet highly soluble anthropogenic component may also be significant. However, quantifying the importance of anthropogenic Fe to the global oceans requires a tracer which can be used to identify and constrain anthropogenic aerosols in situ. Here, we present Fe isotope (δ(56)Fe) data from North Atlantic aerosol samples from the GEOTRACES GA03 section. While soluble aerosol samples collected near the Sahara have near-crustal δ(56)Fe, soluble aerosols from near North America and Europe instead have remarkably fractionated δ(56)Fe values (as light as −1.6‰). Here, we use these observations to fingerprint anthropogenic combustion sources, and to refine aerosol deposition modeling. We show that soluble anthropogenic aerosol Fe flux to the global surface oceans is highly likely to be underestimated, even in the dusty North Atlantic. Nature Publishing Group UK 2019-06-14 /pmc/articles/PMC6570766/ /pubmed/31201307 http://dx.doi.org/10.1038/s41467-019-10457-w Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Conway, Tim M.
Hamilton, Douglas S.
Shelley, Rachel U.
Aguilar-Islas, Ana M.
Landing, William M.
Mahowald, Natalie M.
John, Seth G.
Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes
title Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes
title_full Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes
title_fullStr Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes
title_full_unstemmed Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes
title_short Tracing and constraining anthropogenic aerosol iron fluxes to the North Atlantic Ocean using iron isotopes
title_sort tracing and constraining anthropogenic aerosol iron fluxes to the north atlantic ocean using iron isotopes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6570766/
https://www.ncbi.nlm.nih.gov/pubmed/31201307
http://dx.doi.org/10.1038/s41467-019-10457-w
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