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Spatial variations of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) was surveyed in the surface microlayer and subsurface water of the South China Sea in May 2005.Overall,average subsurface water concentrations of DMS and DMSP of dissolved (DMSPd) and particulate (DMSPp) fractions were 1.74 (1.00-2.50),3.92 (2.21-6.54) and 6.06 (3.40-8.68) nM,respectively.No microlayer enrichment was observed for DMS and DMSPp.In comparison,DMSPd showed a smaller extent of enrichment in the microlayer with an average enrichment factor of 1.40.