西太平洋雅浦海沟区海水中CH_4和DMSP的垂直变化特征  

The vertical variation characteristics of CH_4 and DMSP in the seawater of the Yap Trench in the western Pacific Ocean

作　　者：张梦洁[1,2] 孙承君 杨桂朋[1,2,4,5] 丁海兵 Zhang Mengjie;Sun Chengjun;Yang Guipeng;Ding Haibing(College of Chemistry and Chemical Engineering,Ocean Unviersity of China,Qindao 266100,China;Key Laboratory of Marine Chemistry Theory and Technology/Ministry of Education,Ocean University of China,Qingdao 266100,China;Marine Ecology Center,The First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;Marine Ecology and Environmental Science Laboratory,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;Qingdao Collaborative Innovation Center of Marine Science and Technology,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]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [3]国家海洋局第一海洋研究所生态中心,山东青岛266061 [4]青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室,山东青岛266237 [5]海洋科学与技术青岛协同创新中心,山东青岛266100

出　　处：《海洋学报》2018年第10期143-157,共15页

基　　金：国家重点基础研究发展计划"973"(2015CB755904);国家重点研发计划项目(2016YFA0601302);国家自然科学基金项目(41676067);国家自然科学基金创新群体项目(41521064);中央高校基本科研业务费专项(201762030)

摘　　要：本研究首次探究了西太平洋雅浦海沟北段从表层到超深渊海水中甲烷(CH_4)及二甲基硫(DMS)的前体物质二甲基巯基丙酸内盐(DMSP)的浓度变化情况。结果表明:雅浦海沟海水甲烷浓度变化范围为1.49~3.87nmol/L。其上层海水甲烷平均浓度最高,有明显的次表层极大现象。雅浦海沟氧最小层海水的甲烷平均浓度最低;在500~1 000m中层水中甲烷浓度有一定程度的增大,1 000m以下至底层甲烷浓度继续升高。研究海区溶解态DMSP(DMSPd)和总DMSP(DMSPt)平均浓度的垂直变化随深度呈先增大后减小趋势,颗粒态DMSP(DMSPp)的平均浓度随深度呈波动式变化,在中层达到最大。雅浦海沟CH_4和DMSP浓度垂直变化受浮游生物、微生物、光照、温度、压力、大洋环流等的复杂影响。在真光层海水中,CH_4浓度与DMSPd、DMSPp和DMSPt浓度表现为负相关关系,在200m至底层海水中,CH_4浓度与DMSPd、DMSPp和DMSPt浓度表现为正相关关系,显示光照条件是造成雅浦海沟不同深度海水CH_4和DMSP浓度相关性差异的关键因素。This is the first study of variations of concentrations of methane and precursor of dimethylsulfide(DMS)-dimethylsulfoniopropionate(DMSP)from surface to hadal seawater in the northern area of the Yap Trench in the western Pacific Ocean.The results showed that the concentration of methane seawater of the Yap Trench ranged from 1.49 to 3.87 nmol/L.The concentration of methane was highest in photic water of the trench,and the maximum value occurred in the subsurface layer.Average concentration of methane was the lowest in the oxygen minimum layer of the trench.There was a certain degree increase of concentration of methane in the 500-1 000 m water layer of the trench.Below 1 000 m depth,concentration of methane kept increasing to the bottom water.The vertical variation of the average concentration of DMSPd and DMSPt showed increasing and then decreasing trends with depth.The average concentration of DMSPp showed fluctuation variation trend,with highest value in the mesopelagic layer.The vertical variations of concentraions of methane and DMSP in the Yap Trench was controlled by various factors,including plankton,microorganisms,light,temperature,pressure,ocean circulation,and etc.In photic seawater of the trench,the correlation between concentrations of CH 4 and DMSPd,DMSPp and DMSPt was negative,and from 200 m to bottom seawater,the concentration of CH 4 and DMSP had positive correlation,indicating light condition was the critical factor controlling the correlation between concentrations of methane and DMSPd,DMSPp and DMSPt.

关 键 词：雅浦海沟 甲烷(CH4) 二甲基巯基丙酸内盐(DMSP) 深渊 超深渊 

分 类 号：P734.5[天文地球—海洋化学]