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

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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, Bowie, AR ORCID: 0000-0002-5144-7799, Perron, MMG, Gulieu, C, Meskhidze, N, Johnson, MS, Feng, Y, Kok, JF, Nenes, A and Duce, RA 2019 , 'Pyrogenic iron: the missing link to high iron solubility in aerosols' , Science Advances, vol. 5, no. 5 , pp. 1-10 , doi: 10.1126/sciadv.aau7671.

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Abstract

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.

Item Type: Article
Authors/Creators:Ito, A and Myriokefalitakis, S and Kanakidou, M and Mahowald, NM and Scanza, RA and Hamilton, DS and Baker, AR and Jickells, T and Sarin, M and Bikkina, S and Gao, Y and Shelley, RU and Buck, CS and Landing, WM and Bowie, AR and Perron, MMG and Gulieu, C and Meskhidze, N and Johnson, MS and Feng, Y and Kok, JF and Nenes, A and Duce, RA
Keywords: pyrogenic iron, solubility, aerosols
Journal or Publication Title: Science Advances
Publisher: American Association for the Advancement of Science (A A A S)
ISSN: 2375-2548
DOI / ID Number: 10.1126/sciadv.aau7671
Copyright Information:

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/

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