Quantifying the contribution of marine organic gases to atmospheric iodine

Jones, Charlotte E., Hornsby, Karen E., Sommariva, Roberto, Dunk, Rachel M., von Glasow, Roland, McFiggins, Gordon and Carpenter, Lucy J. (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
Uncontrolled Keywords:	sdg 13 - climate action,sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School:	Faculty of Science > School of Environmental Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Volcanoes@UEA (former - to 2018) Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Meteorology, Oceanography and Climate Dynamics (former - to 2017) Faculty of Science > Research Groups > Atmospheric Chemistry (former - to 2018) Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Depositing User:	Rosie Cullington
Date Deposited:	03 Feb 2011 16:02
Last Modified:	23 Oct 2022 01:29
URI:	https://ueaeprints.uea.ac.uk/id/eprint/20327
DOI:	10.1029/2010GL043990

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