On the speciation of iodine in marine aerosol

Gómez Martín, Juan C., Saiz Lopez, Alfonso, Cuevas, Carlos A., Baker, Alex and Fernandez, Rafael P. (2022) On the speciation of iodine in marine aerosol. Journal of Geophysical Research: Atmospheres, 127 (4). ISSN 2169-897X

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Abstract

We have compiled and analyzed a comprehensive data set of field observations of iodine speciation in marine aerosol. The soluble iodine content of fine aerosol (PM1) is dominated by soluble organic iodine (SOI; ∼50%) and iodide (∼30%), while the coarse fraction is dominated by iodate (∼50%), with non-negligible amounts of iodide (∼20%). The SOI fraction shows an equatorial maximum and minima coinciding with the ocean “deserts,” which suggests a link between soluble iodine speciation in aerosol and ocean productivity. Among the major aerosol ions, organic anions and non-sea-salt sulfate show positive correlations with SOI in PM1. Alkali cations are positively correlated to iodate and negatively correlated with SOI and iodide in coarse aerosol. These relationships suggest that under acidic conditions iodate is reduced to HOI, which reacts with organic matter to form SOI, a possible source of iodide. In less acidic sea-salt or dust-rich coarse aerosols, HOI oxidation to iodate and reaction with organic matter likely compete.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: LivePure Connector
Date Deposited: 24 Feb 2022 09:30
Last Modified: 24 May 2022 14:50
URI: https://ueaeprints.uea.ac.uk/id/eprint/83671
DOI: 10.1029/2021JD036081

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