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This study surveyed dimethylsulfide, dissolved and particulate dimethylsulfoniopropionate concentrations in the surface water of the Berling Sea and Chukchi Sea during the summer of 2012.The Surface water DMS concentrations in the investigated area ranged from 0.01 nM to 16.39 nM, with the average values of 3.39 nM.The tight linkages appeared among DMS, DMSPd and DMSPp, suggesting that phytoplankton-metabolite DMSP, particularly DMSPp, is the important source of in situ DMS.Vertical profiles showed that DMS concentrations declined with depth, with the maximum values appearing in the surface water(0-20 m).More importantly, the biological production and consumption rates of DMS were estimated during this cruise, with the average values of 11.65 and 5.90 nM d-1, respectively.The DMS production and consumption were obviously dependent on the availability of the substrate;these biological processes, in turn, controlled the DMS and DMSP levels.A comparison of DMS biological turnover time to its sea-air turnover time demonstrated that biological consumption would become a predominant mechanism, relative to DMS sea-to-air emission, in the removal of DMS in the surface water column of the Berling Sea and Chukchi Sea during summer.