冬季黄渤海DMS、DMSP和CH_4的分布及影响因素  

Distributions of dimethylsulfide, dimethylsulfoniopropionate, methane and influencing factors in the Yellow Sea and Bohai Sea during winter

作　　者：谭丹丹 张洪海[1,2] 翟星 高旭旭 杨桂朋 TAN Dan-dan;ZHANG Hong-hai;ZHAI Xing;GAO Xu-xu;YANG Gui-peng(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China;Institute of Marine Chemistry,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100 [2]青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室,山东青岛266237 [3]中国海洋大学海洋化学研究所,山东青岛266100

出　　处：《中国环境科学》2019年第5期2143-2153,共11页China Environmental Science

基　　金：国家重点研发计划项目(2016YFA0601301);国家自然科学基金资助项目(41576073);中央高校基本科研业务费资助项目(201762032);海洋国家实验室"鳌山人才"卓越科学家计划项目(2015ASTP)

摘　　要：于2017年12月～2018年1月现场测定了黄、渤海表层海水中二甲基硫(DMS)、二甲巯基丙酸内盐(DMSP)以及溶解甲烷(CH_4)的含量,对DMS、DMSP及CH_4的浓度分布和相互关系进行了研究.通过培养实验探究了DMSP降解对DMS和CH_4生成的影响,并估算了DMS及CH_4的海-气通量.结果表明,表层海水中DMS、DMSPd、DMSPp及CH_4的平均浓度分别为(1.39±1.21),(2.87±1.54),(5.59±4.64),(6.91±2.77)nmol/L.DMS、DMSP与Chl-a水平分布基本一致,均呈现近岸高、远海低的趋势.垂直分布上,DMS、DMSP浓度最大值均出现在浅水层,而CH_4浓度则随深度的增加而增大,至底层达到最大值.相关性分析表明,DMS、DMSPp与Chl-a存在显著的正相关关系,CH_4与DMSPd、DMSPp浓度均存在一定的正相关性(P<0.05).培养实验结果表明,海水中本底DMSPd的浓度越高,DMS的生产速率越大.冬季黄、渤海DMS和CH_4海-气通量的平均值分别为(2.73±3.18),(8.14±7.68)μmol/(m^2·d),表明冬季黄、渤海是大气中DMS、CH_4重要的源.The concentrations of dimethylsulfide(DMS), dimethylsulfoniopropionate(DMSP) and dissolved methane(CH4) were measured in situ in the Yellow Sea and Bohai Sea from December 2017 to January 2018 to study their distributions, correlations and the air-sea fluxes of DMS and CH4. In addition, the influences of DMSP degradation on the productions of DMS and CH4 were also studied through incubation experiments. The average concentrations of DMS, DMSPd, DMSPp and CH4 were(1.39±1.21),(2.87±1.54),(5.59±4.64) and(6.91±2.77) nmol/L in the surface water, respectively. The horizontal distributions of DMS, DMSP, and chlorophyll a(Chl-a) exhibited the same pattern of decreasing from inshore to offshore. The vertical profiles of DMS and DMSP showed that the maximum concentrations both appeared in the upper mixed layer, whereas, the concentration of CH4 increased with depth and reached the maximum at the bottom. Significant correlations were observed between DMS, DMSPp and Chl-a, positive correlations between DMSPd, DMSPp and CH4 were also found(P<0.05). DMSP degradation experiments showed that higher initial concentration of DMSP in seawater, the higher production rate of DMS was. The average air-sea fluxes of DMS and CH4 were estimated to be(2.73±3.18) and(8.14±7.68)μmol/(m2·d) during this investigation, suggesting that the Yellow Sea and Bohai Sea acted as an important source for atmospheric DMS and CH4 in winter.

关 键 词：二甲基硫 二甲巯基丙酸内盐 甲烷 黄海 渤海 

分 类 号：X55[环境科学与工程—环境工程]