Marine Aerosol Iodine Chemistry: The Importance of Soluble Organic Iodine
Alex R. BakerLaboratory for Global Marine and Atmospheric Chemistry, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK. Email: alex.baker@uea.ac.uk
Environmental Chemistry 2(4) 295-298 https://doi.org/10.1071/EN05070
Submitted: 8 September 2005 Accepted: 11 October 2005 Published: 8 December 2005
Environmental Context. Ozone concentrations play a large part in controlling the oxidation capacity of the marine boundary layer, while the production of new aerosol particles affects atmospheric radiative balance. Iodine has a complex chemistry in the marine atmosphere which impacts on both these processes. Much of this iodine chemistry, especially the chemical speciation of iodine in aerosol, is only poorly understood. This study explores the occurrence and abundance of organic forms of iodine, a topic that has received very little attention to date.
Abstract. Iodine has a complex chemistry in aerosols in the marine boundary layer (MBL), and is involved in both ozone destruction and new aerosol particle formation processes. Work in this area has focussed almost exclusively on inorganic iodine chemistry. Results from two research cruises in the Atlantic Ocean, covering wide longitude (60°W to 0°W) and latitude (50°N to 50°S) ranges indicate that soluble organic iodine species are both widespread and abundant in marine aerosol. The reactivity of these species is yet to be determined, but may influence the concentrations of some aerosol inorganic iodine species, and may also impact on MBL ozone destruction reactions.
Keywords. : aerosols — atmospheric chemistry — dissolved organic matter — iodine
Acknowledgments
Thanks are due to the Masters and crews of FS Meteor and RRS James Clark Ross and the chief scientists of M55, Doug Wallace, and AMT13, Carol Robinson. This study was supported by the UK Natural Environment Research Council through grant NER/B/S/2002/00301 and the Atlantic Meridional Transect consortium (NER/O/S/2001/00680). This is contribution number 110 of the AMT programme. Comments on the manuscript from Bob Duce and two anonymous reviewers are gratefully acknowledged.
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