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133882 - Pyrogenic iron- The missing link to high iron.pdf (3.6 MB)

Pyrogenic iron: the missing link to high iron solubility in aerosols

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journal contribution
posted on 2023-05-20, 05:33 authored by Ito, A, Myriokefalitakis, S, Kanakidou, M, Mahowald, NM, Scanza, RA, Hamilton, DS, Baker, AR, Jickells, T, Sarin, M, Bikkina, S, Gao, Y, Shelley, RU, Buck, CS, Landing, WM, Andrew BowieAndrew Bowie, Perron, MM, Gulieu, C, Meskhidze, N, Johnson, MS, Feng, Y, Kok, JF, Nenes, A, Duce, RA
Atmospheric deposition is a source of potentially bioavailable iron (Fe) and thus can partially control biological productivity in large parts of the ocean. However, the explanation of observed high aerosol Fe solubility compared to that in soil particles is still controversial, as several hypotheses have been proposed to explain this observation. Here, a statistical analysis of aerosol Fe solubility estimated from four models and observations compiled from multiple field campaigns suggests that pyrogenic aerosols are the main sources of aerosols with high Fe solubility at low concentration. Additionally, we find that field data over the Southern Ocean display a much wider range in aerosol Fe solubility compared to the models, which indicate an underestimation of labile Fe concentrations by a factor of 15. These findings suggest that pyrogenic Fe-containing aerosols are important sources of atmospheric bioavailable Fe to the open ocean and crucial for predicting anthropogenic perturbations to marine productivity.

Funding

Australian Research Council

History

Publication title

Science Advances

Volume

5

Issue

5

Article number

eaau7671

Number

eaau7671

Pagination

1-11

ISSN

2375-2548

Department/School

Institute for Marine and Antarctic Studies

Publisher

American Association for the Advancement of Science (A A A S)

Place of publication

United States

Rights statement

Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Licensed under Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) https://creativecommons.org/licenses/by-nc/4.0/

Repository Status

  • Open

Socio-economic Objectives

Atmospheric composition (incl. greenhouse gas inventory); Measurement and assessment of marine water quality and condition

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