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

Akinori Ito, Stelios Myriokefalitakis, Maria Kanakidou, Natalie M. Mahowald, Rachel A. Scanza, Douglas S. Hamilton, Alex R. Baker, Timothy Jickells, Manmohan Sarin, Srinivas Bikkina, Yuan Gao, Rachel U. Shelley, Clifton S. Buck, William M. Landing, Andrew R. Bowie, Morgane M.G. Perron, Cécile Guieu, Nicholas Meskhidze, Matthew S. Johnson, Yan FengJasper F. Kok, Athanasios Nenes, Robert A. Duce

Research output: Contribution to journalArticlepeer-review

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 frommultiple field campaigns suggests that pyrogenic aerosols are themain sources of aerosolswith 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.

Original languageEnglish (US)
Article numbereaau7671
JournalScience Advances
Volume5
Issue number5
DOIs
StatePublished - 2019

ASJC Scopus subject areas

  • General

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