Under meteorologically stable conditions, the main source of nss sulfur to the atmosphere was the flux of dimethylsulfide (DMS) from the ocean. Seawater DMS concentrations were highest in the subtropical waters west of Tasmania and decreased with increasing latitude. The mean ocean to atmosphere flux was 8.5 umoles/m2/d. The higher flux in the lower latitudes contributed to a larger mean diameter of the Aitken and accumulation modes.