Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum

Relief of iron (Fe) limitation in the Southern Ocean during ice ages, with potentially increased carbon storage in the ocean, has been invoked as one driver of glacial–interglacial atmospheric CO2 cycles. Ice and marine sediment records demonstrate that atmospheric dust supply to the oceans increase...

Full description

Bibliographic Details
Main Authors:	Conway, T.M., Wolff, E.W., Röthlisberger, R., Mulvaney, R., Elderfield, H.E.
Format:	Online
Language:	English
Published:	Nature Pub. Group 2015
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4525188/

id	pubmed-4525188
recordtype	oai_dc
spelling	pubmed-45251882015-09-04 Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum Conway, T.M. Wolff, E.W. Röthlisberger, R. Mulvaney, R. Elderfield, H.E. Article Relief of iron (Fe) limitation in the Southern Ocean during ice ages, with potentially increased carbon storage in the ocean, has been invoked as one driver of glacial–interglacial atmospheric CO2 cycles. Ice and marine sediment records demonstrate that atmospheric dust supply to the oceans increased by up to an order of magnitude during glacial intervals. However, poor constraints on soluble atmospheric Fe fluxes to the oceans limit assessment of the role of Fe in glacial–interglacial change. Here, using novel techniques, we present estimates of water- and seawater-soluble Fe solubility in Last Glacial Maximum (LGM) atmospheric dust from the European Project for Ice Coring in Antarctica (EPICA) Dome C and Berkner Island ice cores. Fe solubility was very variable (1–42%) during the interval, and frequently higher than typically assumed by models. Soluble aerosol Fe fluxes to Dome C at the LGM (0.01–0.84 mg m−2 per year) suggest that soluble Fe deposition to the Southern Ocean would have been ≥10 × modern deposition, rivalling upwelling supply. Nature Pub. Group 2015-07-23 /pmc/articles/PMC4525188/ /pubmed/26204562 http://dx.doi.org/10.1038/ncomms8850 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ 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/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Conway, T.M. Wolff, E.W. Röthlisberger, R. Mulvaney, R. Elderfield, H.E.
spellingShingle	Conway, T.M. Wolff, E.W. Röthlisberger, R. Mulvaney, R. Elderfield, H.E. Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum
author_facet	Conway, T.M. Wolff, E.W. Röthlisberger, R. Mulvaney, R. Elderfield, H.E.
author_sort	Conway, T.M.
title	Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum
title_short	Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum
title_full	Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum
title_fullStr	Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum
title_full_unstemmed	Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum
title_sort	constraints on soluble aerosol iron flux to the southern ocean at the last glacial maximum
description	Relief of iron (Fe) limitation in the Southern Ocean during ice ages, with potentially increased carbon storage in the ocean, has been invoked as one driver of glacial–interglacial atmospheric CO2 cycles. Ice and marine sediment records demonstrate that atmospheric dust supply to the oceans increased by up to an order of magnitude during glacial intervals. However, poor constraints on soluble atmospheric Fe fluxes to the oceans limit assessment of the role of Fe in glacial–interglacial change. Here, using novel techniques, we present estimates of water- and seawater-soluble Fe solubility in Last Glacial Maximum (LGM) atmospheric dust from the European Project for Ice Coring in Antarctica (EPICA) Dome C and Berkner Island ice cores. Fe solubility was very variable (1–42%) during the interval, and frequently higher than typically assumed by models. Soluble aerosol Fe fluxes to Dome C at the LGM (0.01–0.84 mg m−2 per year) suggest that soluble Fe deposition to the Southern Ocean would have been ≥10 × modern deposition, rivalling upwelling supply.
publisher	Nature Pub. Group
publishDate	2015
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4525188/
_version_	1613255871540756480

Constraints on soluble aerosol iron flux to the Southern Ocean at the Last Glacial Maximum

Similar Items