On the Speciation of Iodine in Marine Aerosol

DOI: 
10.1029/2021JD036081
Publication date: 
27/02/2022
Main author: 
Gómez Martín J.C.
IAA authors: 
Gómez Martín, Juan Carlos
Authors: 
Gómez Martín, Juan Carlos;Saiz-Lopez, Alfonso;Cuevas, Carlos A.;Baker, Alex R.;Fernández, Rafael P.
Journal: 
Journal of Geophysical Research: Atmospheres
Publication type: 
Article
Volume: 
127.0
Pages: 
e2021JD036081
Number: 
e2021JD036081
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 nonnegligible 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.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2022JGRD..12736081G/abstract
ADS Bibcode: 
2022JGRD..12736081G
Keywords: 
aerosol composition | iodine chemistry