Chloro-iodomethane in N. Atlantic waters - A potentially significant source of atmospheric iodine

Details Chloro-iodomethane in N. Atlantic waters - A potentially significant source of atmospheric iodine Chloro-iodomethane in N. Atlantic waters - A potentially significant source of atmospheric iodine

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1779m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 17, Sept. 4, 1992, p. 1779-1782. Research supported by NSERC.

Physics

17

Air Water Interactions, Chlorocarbons, Iodine Compounds, Phytoplankton, Sea Water, Surface Water, Atlantic Ocean, Atmospheric Composition, Henry Law, Iodine, Vertical Distribution

Scientific paper

Measurements have been made of chloroiodomethane (CH2ClI) in seawater samples collected in the N.W. Atlantic. Elevated concentrations (greater than 3 ng/L) were found in surface waters at a number of locations in the pelagic zone. Background surface concentrations in the pelagic zone were 0.1-0.4 ng/L. Coastal/shelf regions averaged 0.1 ng/L off Labrador and Greenland, and 0.8 ng/L on the Grand Banks. It is suggested that its distribution may be due to a phytoplankton source, either direct or indirect (i.e., via an intermediate compound). Using measurements of methyl iodide (CH3I) made on the same samples, a first order estimate is made of the comparative fluxes of the two compounds from ocean to atmosphere. This indicates that the iodine carried by CH2ClI may be comparable with that carried as CH3I. Refinement of the flux estimates requires measurements of atmospheric concentrations of CH2ClI, and determination of its Henry's law constant.

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