Production in variability of methyl iodide (CH3I) in the surface Ocean

Shi, Qiang, Petrick, Gert, Quack, Birgit, Wuttig, Kathrin and Wallace, Douglas W.R. (2012) Production in variability of methyl iodide (CH3I) in the surface Ocean [Poster] In: SOLAS Open Science Conference, 07. - 10.05.2012, Cle Elum, Washington, USA.

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Volatile iodocarbons, including CH3I, are major carriers of iodine from the ocean to the atmosphere. The transferred iodine participates in ozone destruction and aerosol formation in the troposphere. However, the production pathways and controls on emission are poorly understood. Experiments to investigate CH3I production were conducted over an annual cycle in the Kiel Fjord. The experiments involved 60 hour light and dark incubations of natural seawater. Samples incubated in the light had significantly higher daily production than samples kept in the dark. Daytime production was not affected by filtration (0.2µm), suggestive of a photochemical pathway for CH3I production. A strong seasonal variation in daily production rates was correlated with both temperature and light intensity variations. We compare these experimental results with the variability of CH3I concentration in surface seawater measured in the South China Sea during the SHIVA Sonne cruise in November 2011.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Projects: SOLAS
Date Deposited: 27 Sep 2012 12:06
Last Modified: 27 Sep 2012 12:06

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