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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Digital Commons @ University of South Florida
2019
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ftusouthflorida:oai:digitalcommons.usf.edu:geo_facpub-3131 2023-07-30T04:05:12+02:00 Tracing and Constraining Anthropogenic Aerosol Iron Fluxes to the North Atlantic Ocean using Iron Isotopes Conway, Tim Hamilton, Douglas S. Shelley, Rachel U. Aguilar-Islas, Ana M. Landing, William M. Mahowald, Natalie M. John, Seth G. 2019-01-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/geo_facpub/2158 https://doi.org/10.1038/s41467-019-10457-w https://digitalcommons.usf.edu/context/geo_facpub/article/3131/viewcontent/s41467_019_10457_w.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/geo_facpub/2158 doi:10.1038/s41467-019-10457-w https://digitalcommons.usf.edu/context/geo_facpub/article/3131/viewcontent/s41467_019_10457_w.pdf http://creativecommons.org/licenses/by/4.0/ School of Geosciences Faculty and Staff Publications Earth Sciences article 2019 ftusouthflorida https://doi.org/10.1038/s41467-019-10457-w 2023-07-13T21:58:10Z 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 (δ56Fe) data from North Atlantic aerosol samples from the GEOTRACES GA03 section. While soluble aerosol samples collected near the Sahara have near-crustal δ56Fe, soluble aerosols from near North America and Europe instead have remarkably fractionated δ56Fe 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. Article in Journal/Newspaper North Atlantic University of South Florida St. Petersburg: Digital USFSP Nature Communications 10 1 |
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Open Polar |
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University of South Florida St. Petersburg: Digital USFSP |
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ftusouthflorida |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Conway, Tim 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 |
topic_facet |
Earth Sciences |
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 (δ56Fe) data from North Atlantic aerosol samples from the GEOTRACES GA03 section. While soluble aerosol samples collected near the Sahara have near-crustal δ56Fe, soluble aerosols from near North America and Europe instead have remarkably fractionated δ56Fe 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. |
format |
Article in Journal/Newspaper |
author |
Conway, Tim Hamilton, Douglas S. Shelley, Rachel U. Aguilar-Islas, Ana M. Landing, William M. Mahowald, Natalie M. John, Seth G. |
author_facet |
Conway, Tim Hamilton, Douglas S. Shelley, Rachel U. Aguilar-Islas, Ana M. Landing, William M. Mahowald, Natalie M. John, Seth G. |
author_sort |
Conway, Tim |
title |
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_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_sort |
tracing and constraining anthropogenic aerosol iron fluxes to the north atlantic ocean using iron isotopes |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2019 |
url |
https://digitalcommons.usf.edu/geo_facpub/2158 https://doi.org/10.1038/s41467-019-10457-w https://digitalcommons.usf.edu/context/geo_facpub/article/3131/viewcontent/s41467_019_10457_w.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
School of Geosciences Faculty and Staff Publications |
op_relation |
https://digitalcommons.usf.edu/geo_facpub/2158 doi:10.1038/s41467-019-10457-w https://digitalcommons.usf.edu/context/geo_facpub/article/3131/viewcontent/s41467_019_10457_w.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1038/s41467-019-10457-w |
container_title |
Nature Communications |
container_volume |
10 |
container_issue |
1 |
_version_ |
1772816972416811008 |