Particulate phases are key in controlling dissolved iron concentrations in the (sub)-tropical North Atlantic

Milne, Angela, Schlosser, Christian, Wake, Bronwyn D., Achterberg, Eric P., Chance, Rosie, Baker, Alex R., Forryan, Alex and Lohan, Maeve C. (2017) Particulate phases are key in controlling dissolved iron concentrations in the (sub)-tropical North Atlantic Geophysical Research Letters, 44 (5). pp. 2377-2387. DOI 10.1002/2016GL072314.

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The supply and bioavailability of iron (Fe) controls primary productivity and N2-fixation in large parts of the global ocean. An important, yet poorly quantified, source to the ocean is particulate Fe (pFe). Here we present the first combined dataset of particulate, labile-particulate (L-pFe) and dissolved Fe (dFe) from the (sub)-tropical North Atlantic. We show a strong relationship between L-pFe and dFe, indicating a dynamic equilibrium between these two phases whereby particles ‘buffer’ dFe and maintain the elevated concentrations observed. Moreover, L-pFe can increase the overall ‘available’ (L-pFe + dFe) Fe pool by up to 55%. The lateral shelf flux of this available Fe was similar in magnitude to observed soluble aerosol-Fe deposition, a comparison that has not been previously considered. These findings demonstrate that L-pFe is integral to Fe cycling and hence plays a role in regulating carbon cycling, warranting its’ inclusion in Fe budgets and biogeochemical models.

Document Type: Article
Additional Information: All data that supports the findings of this study have been submitted to the British Oceanographic Data Centre.
Keywords: Iron, sub-tropical North Atlantic, RRS Discovery
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University
Refereed: Yes
DOI etc.: 10.1002/2016GL072314
ISSN: 0094-8276
Projects: Future Ocean
Date Deposited: 21 Feb 2017 10:00
Last Modified: 19 Dec 2017 12:44

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