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于2012年7—9月现场测定了北极挪威海和格陵兰海区域海水二甲基硫(DMS)及其前体物质二甲巯基丙酸内盐(DMSP,分溶解态DMSPd和颗粒态DMSPp)的含量,研究了其空间分布格局及其影响因素,探讨了表层海水DMS的生物周转和去除途径。结果表明,表层海水DMS、DMSPd和DMSPp的平均浓度分别为5.36nmol/L、15.63nmol/L和96.73nmol/L,受挪威海流和北极深层水影响,表层海水二甲基硫化物浓度呈现出由低纬度向高纬度海域递减的趋势。DMSPd和DMSPp浓度与Chl a浓度均有显著的相关性,说明浮游植物生物量是影响挪威海和格陵兰海二甲基硫化物生产的重要因素。表层海水DMS生物生产和消费速率平均值分别为18.19nmol/(L·d)、15.67nmol/(L·d)。DMS微生物周转时间变化范围为0.03~1.80d,平均值为0.49d,DMS海-气周转时间是微生物消费时间的90倍,说明夏季挪威海和格陵兰海表层海水中DMS微生物消费过程是比海-气扩散更具优势的去除机制。
From July to September in 2012, the concentrations of dimethylsulfide (DMS) and its dimercaptopropionate inner salt (DMSP, DMSPd and DMSPp) in the Arctic Sea of Norway and the Greenland Sea were measured in situ Content, studied the spatial distribution pattern and its influencing factors, and discussed the biological turnover and removal ways of surface seawater DMS. The results showed that the mean concentration of DMS, DMSPd and DMSPp in surface seawater was 5.36nmol / L, 15.63nmol / L and 96.73nmol / L, respectively. Influenced by the Norwegian current and Arctic deepwater, The trend of decreasing from low latitudes to high latitudes. There was a significant correlation between DMSPd and DMSPp concentration and Chl a concentration, indicating that phytoplankton biomass is an important factor affecting dimethyl sulfide production in the Norwegian Sea and Greenland. The average DMS production and consumption rates of surface seawater were 18.19nmol / (L · d) and 15.67nmol / (L · d), respectively. DMS microbial turnover time range of 0.03 ~ 1.80d, average 0.49d, DMS sea-gas turn-around time is 90 times the microbial consumption time, indicating summer summer in Norway and Greenland sea surface water DMS microbial consumption process than the sea - Gas diffusion more advantageous removal mechanism.