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Characteristics of vertical distributions of methane and dimethylsulphoniopropionate in the southern Yap Trench

Journal of Oceanology and Limnology 2023年第6期41卷 2101-2116页

作者： Yuhuan HUANG Chengjun SUN Lina Lü Neal Xiangyu DING Liangmin YU Guipeng YANG Haibing DING Frontier Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Marine Ecology and Environmental Science Laboratory Laoshan Laboratory(Qingdao)Qingdao 266237China Marine Bioresource and Environment Research Center the First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China College of Agriculture and Life Sciences Cornell UniversityIthacaNY 14853USA

methane(CH_(4) )and dimethylsulphoniopropionate(DMSP)are major carbon and sulfur sources for bacterioplankton in the *** investigated the characteristics of CH_(4) and DMSP in the southern Yap Trench from sea surface to hadal zone in June *** found that concentrations of CH_(4) varied from 1.5 to 4.5 nmol/L with saturation between 94% and 204% in the euphotic *** of dissolved DMSP(DMSPd)ranged from 0.5 to 3.7 nmol/L with higher values in surface water and decreased with *** of particulate DMSP(DMSPp)varied from 0 to 13.6 nmol/*** of total DMSP(DMSPt)ranged 2.0-15.2 nmol/*** concentrations decreased slightly and reached consistent levels in 200-3000-m depth due probably to heterotrophic bacterial production in marine aphotic and high-pressure *** exception occurred around 4000-m depth where their concentrations increased considerably and then decreased in deeper *** previously unrecognized phenomenon sheds light on the elevated concentrations of DMSP in the abyssal layer that might be affected by the Lower Circumpolar Deep Water(LCPW).Concentrations of CH_(4) in seawater of the Benthic Boundary Layer of the southern Yap Trench were slightly higher than those in the water column at approximate depth,and concentrations of DMSP in seawater of the Benthic Boundary Layer of the southern Yap Trench were not much higher than those in the water column at the approximate depth,indicating that sediment was a weak source of CH_(4) but was not a source of DMSP for seawater in the study *** study presented clear correlations between CH_(4) and DMSP from sea surface to sea bottom,proving that DMSP might be a potential substrate for CH_(4) not only in oxic surface seawater but also in deep water.

关键词： methane dimethylsulphoniopropionate(DMSP) hadal zone Jiaolong submersible Yap Trench oceanic methane paradox

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