挪威海和格陵兰海海水DMS分布特征及影响因素研究  

Spatial distributions of Dimethylsulfide(DMS)and influencing factors in the Norwegian and Greenland Seas during summer

作　　者：厉丞烜[1] 王保栋[1] 杨桂朋[2] 

机构地区：[1]国家海洋局第一海洋研究所海洋生态研究中心,山东青岛266061 [2]中国海洋大学化学化工学院,山东青岛266100

出　　处：《海洋学报》2015年第8期9-25,共17页

基　　金：国家自然科学基金(41106071,41320104008);国家海洋局青年海洋科学基金(2012503);国家海洋局第一海洋研究所基本科研业务费专项基金(GY02-2011T01);2013年留学人员科技活动择优自助项目(02648)

摘　　要：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DM—SPp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Chlα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海一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一气扩散更具优势的去除机制。The dimethylsulfide （DMS）, dissolved and particulate dimethylsulfoniopropionate （DMSPd and DMSPp） concentrations were determined in the Norwegian and Greenland Seas during summer of 2012. Surface DMS,DMSPd and DMSPp concentrations in the study area increased significantly from high lati- tudes to low latitudes,with the average values of 5.36,15.63 and 96.73 nmol/L,respectively. Moreover, the biological production and consumption rates of DMS were estimated during the cruise, with the average values of 18.19 and 15.67 nmol/（L. d）, respectively. Our results showed that the spatial variation of chlorophyll a was consistent with that of DMSPd and DMSPp concentrations,suggesting that phytoplankton biomass might play an important role in controlling the distribution of DMSP in the study area. In the surface water,the biological turnover time of DMS varied from 0.03 to 1.8 days,with an average of 0.49 days,which was about 90-fold faster than the mean DMS sea-air turnover time （28.8 days）. Thus, themain sink of DMS in the surface water appears to be microbial consumption.

关 键 词：二甲基硫 二甲巯基丙酸内盐 浓度分布 生物周转 挪威海和格陵兰海 

分 类 号：P734.2[天文地球—海洋化学]