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The interplay between regeneration and scavenging fluxes drives ocean iron cycling


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Tagliabue, A, Bowie, AR ORCID: 0000-0002-5144-7799, DeVries, T, Ellwood, MJ, Landing, WM, Milne, A, Ohnemus, DC, Twining, BS and Boyd, PW ORCID: 0000-0001-7850-1911 2019 , 'The interplay between regeneration and scavenging fluxes drives ocean iron cycling' , Nature Communications, vol. 10, no. 1 , pp. 1-8 , doi: 10.1038/s41467-019-12775-5.

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Despite recent advances in observational data coverage, quantitative constraints on howdifferent physical and biogeochemical processes shape dissolved iron distributions remainelusive, lowering confidence in future projections for iron-limited regions. Here we show thatdissolved iron is cycled rapidly in Pacific mode and intermediate water and accumulates at arate controlled by the strongly opposing fluxes of regeneration and scavenging. Combiningnew data sets within a watermass framework shows that the multidecadal dissolved ironaccumulation is much lower than expected from a meta-analysis of iron regeneration fluxes.This mismatch can only be reconciled by invoking significant rates of iron removal to balanceiron regeneration, which imply generation of authigenic particulate iron pools. Consequently,rapid internal cycling of iron, rather than its physical transport, is the main control onobserved iron stocks within intermediate waters globally and upper ocean iron limitation willbe strongly sensitive to subtle changes to the internal cycling balance.

Item Type: Article
Authors/Creators:Tagliabue, A and Bowie, AR and DeVries, T and Ellwood, MJ and Landing, WM and Milne, A and Ohnemus, DC and Twining, BS and Boyd, PW
Keywords: regeneration, scavenging, ocean, iron, cycling
Journal or Publication Title: Nature Communications
Publisher: Nature Publishing Group
ISSN: 2041-1723
DOI / ID Number: 10.1038/s41467-019-12775-5
Copyright Information:

© The Author(s) 2019. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

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