Pyrogenic iron: The missing link to high iron solubility in aerosols
2019
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
aerosolFe 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
aerosolFe solubility estimated from four models and observations compiled from multiple field campaigns suggests that pyrogenic
aerosolsare the main 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
aerosolFe 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
aerosolsare important sources of atmospheric bioavailable Fe to the open ocean and crucial for predicting anthropogenic perturbations to marine productivity.
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