Coastal zone production of IO precursors: A 2-dimensional study

Carpenter, L. J., Hebestreit, K., Platt, U. and Liss, P. S. (2001) Coastal zone production of IO precursors: A 2-dimensional study. Atmospheric Chemistry and Physics, 1 (1). pp. 9-18. ISSN 1680-7324

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At Mace Head, Eire, in the coastal East Atlantic, diiodomethane has been identified as an important precursor of iodine oxide radicals. Peak concentrations of both CH2I2 and IO at low water indicate that the intertidal region is a strong source of organo-iodines. Atmospheric measurements of CH2I2 made in marine air are compared with the concentrations predicted by a 2-dimensional model incorporating horizontal and vertical dispersion of surface emissions. The model shows that micrometeorological variability, proximity of the site to emissions, and photolysis all play important roles in determining the CH2I 2 concentrations at Mace Head. In addition to a tidal-height dependent intertidal flux, which was estimated from seaweed production data, a contribution from offshore (non-local) sources was required in order to reproduce the strong signature of photolysis in the CH2I2 observations. A combination of an offshore flux and an intertidal flux (of up to 1.4 × 109 molecules cm-2 s-1 at low water) results in good agreement between the measured and modelled CH 2I2 concentrations. Although this study does not necessarily infer emission of CH2I2 from the open ocean, it suggests that air-sea exchange of CH2I2 in coastal waters does occur.

Item Type: Article
Uncontrolled Keywords: sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
Faculty \ School: University of East Anglia Research Groups/Centres > Theme - ClimateUEA
Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Groups > Climatic Research Unit
Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017)
Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017)
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Depositing User: Rosie Cullington
Date Deposited: 16 Jun 2011 08:55
Last Modified: 11 Sep 2023 13:30
DOI: 10.5194/acp-1-9-2001

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