Abstract
We measured partial pressures of CH 2Cl 2 (dichloromethane) and CCl 3F (CFC-11) in air and surface seawater of the Indian and Southern Oceans from November 2009 to January 2010. The excess CH 2Cl 2 saturation anomaly (ΔSA CH2Cl2 > 0) in surface seawater between 10°S and 40°S, which is the corrected value of saturation anomaly after subtracting the effects of summertime sea-surface temperature increase and of summertime decrease of atmospheric CH 2Cl 2 level, provides evidence for in-situ production of CH 2Cl 2. Depth profiles from the South Indian Ocean at 5°S, 20°S and 30°S showed concentration maxima of dihalomethanes (CH 2I 2, CH 2ClI and CH 2Cl 2) and chlorophyll-a in the subsurface layer (20–150 m). Our data suggest that phytoplankton production of dihalomethanes leads to concentration maxima in the subsurface layer and ΔSA CH2Cl2 > 0 in surface seawater between 10°S and 40°S. The average oceanic emission of CH 2Cl 2 derived from the region between 10°S and 40°S in the South Indian Ocean was calculated to be 0.29–0.43 μg m −2 d −1.
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