Quantifying the contribution of marine organic gases to atmospheric iodine

Jones, CE, Hornsby, KE, Sommariva, R, Dunk, RM, von Glasow, R, McFiggins, G and Carpenter, LJ (2010) Quantifying the contribution of marine organic gases to atmospheric iodine. Geophysical Research Letters, 37 (18). ISSN 1944-8007

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Abstract

Oceanic emissions of gaseous organic iodine-atom precursors have the potential to significantly affect atmospheric chemistry and climate, however there is currently considerable uncertainty associated with quantifying their sources. We present sea-air fluxes calculated from simultaneous air and seawater measurements of a comprehensive range of volatile organic iodine compounds (VOICs), including CH3I and the less commonly reported dihalomethanes CH2ICl, CH2IBr and CH2I2, made during two cruises in the Atlantic Ocean between 15-58N. The combined dihalomethane flux provides a global iodine source (~0.33 0.19 Tg I y -1) comparable to that of CH3I, and a surface iodine atom source 3-4 times higher. However, a 1D atmospheric model reveals that, in the tropical east Atlantic Ocean in the vicinity of Cape Verde, even these combined VOIC fluxes are capable of supporting only ~10-25% of the observed IO levels, and suggests that a substantial (340-640 nmol I m-2 d -1) additional photochemical source of iodine is required.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Rosie Cullington
Date Deposited: 03 Feb 2011 16:02
Last Modified: 28 Nov 2018 15:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/20327
DOI: 10.1029/2010GL043990

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