Quantifying the contribution of marine organic gases to atmospheric iodine

Details Quantifying the contribution of marine organic gases to atmospheric iodine Quantifying the contribution of marine organic gases to atmospheric iodine

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3718804j&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 18, CiteID L18804

Physics

5

Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504)

Scientific paper

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 15-58°N. 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.

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