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

Angela Milne (Lead Author), Christian Schlosser, Bronwyn D. Wake, Eric P. Achterberg, Rosie Chance, Alex R. Baker, Alex Forryan, Maeve C. Lohan

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Abstract

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.
Original languageEnglish
Pages (from-to)2377–2387
Number of pages11
JournalGeophysical Research Letters
Volume44
Issue number5
Early online date4 Mar 2017
DOIs
Publication statusPublished - 16 Mar 2017

Keywords

  • particulate iron
  • labile-particulate iron
  • dissolved iron
  • (sub)tropical North Atlantic
  • oxygen minimum zone
  • GEOTRACES
  • biogeosciences
  • marine systems
  • metals
  • trace element cycling

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