Konig, D, Conway, TM, Hamilton, DS and Tagliabue, A 
ORCID: 0000-0002-3572-3634
(2022)
Surface Ocean Biogeochemistry Regulates the Impact of Anthropogenic Aerosol Fe Deposition on the Cycling of Iron and Iron Isotopes in the North Pacific.
GEOPHYSICAL RESEARCH LETTERS, 49 (13).
e2022GL098016-.
Abstract
Distinctively-light isotopic signatures associated with Fe released from anthropogenic activity have been used to trace basin-scale impacts. However, this approach is complicated by the way Fe cycle processes modulate oceanic dissolved Fe (dFe) signatures (δ<sup>56</sup>Fe<sub>diss</sub>) post deposition. Here we include dust, wildfire, and anthropogenic aerosol Fe deposition in a global ocean biogeochemical model with active Fe isotope cycling, to quantify how anthropogenic Fe impacts surface ocean dFe and δ<sup>56</sup>Fe<sub>diss</sub>. Using the North Pacific as a natural laboratory, the response of dFe, δ<sup>56</sup>Fe<sub>diss</sub>, and primary productivity are spatially and seasonally variable and do not simply follow the footprint of atmospheric deposition. Instead, the effect of anthropogenic Fe is regulated by the biogeochemical regime, specifically the degree of Fe limitation and rates of primary production. Overall, we find that while δ<sup>56</sup>Fe<sub>diss</sub> does trace anthropogenic input, the response is muted by fractionation during phytoplankton uptake, but amplified by other isotopically-light Fe sources.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | anthropogenic iron, iron isotopes, model, ocean, biogeochemistry |
| Divisions: | Faculty of Science and Engineering > School of Environmental Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 20 Jul 2022 09:04 |
| Last Modified: | 18 Jan 2023 20:56 |
| DOI: | 10.1029/2022GL098016 |
| Open Access URL: | http://doi.org/10.1029/2022gl098016 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3158993 |
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