Dimethyl sulfide over the western Atlantic Ocean

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Abstract
Dimethyl sulfide and anthropogenic pollutants were measured over the western Atlantic Ocean during January and February 1986, 50 to 150 km east of Boston, MA and in the vicinity of Bermuda in June 1986. The highest DMS concentration measured in the vicinity of Boston was 18 pptv; all other values within the mixed layer (ML) were between 0.5 and 12 pptv. The free troposphere (FT) values were 0.5–5.0 pptv. Sea to air fluxes were estimated at 36 to 66 ng m−2 min−1. FT values measured near Bermuda were 1–17 pptv, and most values were <10 pptv. The Bermuda ML values (35–195 pptv) were as much as 10 times greater than those found near Boston. A steep vertical gradient was observed within the ML in the mid‐ocean measurements, indicating that DMS removal rates were faster than the ML mixing times. Several variables may be of consequence in the differences observed between the Boston and Bermuda measurements; the most important of these appear to be the air mass travel time over the ocean and the sea surface temperature.

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