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Air/sea fluxes of dimethylsulfide (DMS) were measured by eddy correlationover the Eastern South Pacific Ocean during January 2006. The cruise trackextended from Manzanillo, Mexico, along 110° W, to Punta Arenas, Chile.Bulk air and surface ocean DMS levels were also measured and gas transfercoefficients (kDMS) were computed. Air and seawater DMS measurementswere made using chemical ionization mass spectrometry (API-CIMS) and agas/liquid membrane equilibrator. Mean surface seawater DMS concentrationswere 3.8±2.2 nM and atmospheric mixing ratios were 340±370 ppt.The air/sea flux of DMS was uniformly out of the ocean, with an averagevalue of 12±15 μmol m−2 d−1. Sea surface concentrationand flux were highest around 15° S, in a region influenced by shelfwaters and lowest around 25° S, in low chlorophyll gyre waters. The DMSgas transfer coefficient exhibited a linear wind speed-dependence over thewind speed range of 1 to 9 m s−1. This relationship is compared withpreviously measured estimates of k from DMS, CO2, and dual tracer datafrom the Atlantic and Pacific Ocean, and with the NOAA/COARE gas transfermodel. The model generated slope of k vs. wind speed is at the low end ofthose observed in previous DMS field studies

Open ocean DMS air/sea fluxes over the eastern South Pacific Ocean