Abstract: The distribution of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) in ice cores was analyzed. The cores were drilled from coastal fast ice off Zhongshan station in East Antarctica during the 30th Chinese National Antarctic Research Expedition. The highest concentrations of DMSP + DMS were 114.93 nM and 134.41 nM, observed in the top layer of two ice cores. Both DMS and DMSP + DMS concentrations decreased from the top to bottom of the ice cores. There were two different factors controlling DMSP + DMS in the upper layer of the ice cores; one was related to algal assemblages, and the other was related to DMS accumulation in the slush layer. This DMS accumulation occurs because the ice and snow layer covering the sea ice blocks the emission of DMS into the atmosphere. Concentrations of chlorophyll a (Chl a) and DMSP + DMS were low in the bottom of ice cores because the bottom layer of sea ice with high biomass melts during the summer. During the sea ice melting season, gravity-related drainage of brine could alter the vertical distribution of Chl a and DMSP + DMS. The integrated Chl a and DMSP + DMS in ice cores analyzed during the present study (6.79–10.20 mg·m^-2 and 51.83–88.41 μmol·m^-2, respectively) were low compared with previous studies, indicating that the melt process could lead to a decline in biomass and DMSP + DMS in ice cores.

Key words: sea ice, ice core, dimethylsulfide（DMS）, dimethylsulfoniopropionat(DMSP), Antarctica