Methane in the Yellow Sea and East China Sea: dynamics, distribution, and production  

作　　者：Wangwang YE Guanxiang DU Honghai ZHANG Guiling ZHANG 

机构地区：[1]Frontiers Science Center for Deep Ocean Multispheres and Earth System,and Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China [2]Key Laboratory of Global Change and Marine-Atmospheric Chemistry,Third Institute of Oceanography,Ministry of Natural Resources,Xiamen 361005,China [3]Laboratory for Marine Ecology and Environmental Science,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China

出　　处：《Journal of Oceanology and Limnology》2022年第2期530-550,共21页海洋湖沼学报（英文）

基　　金：Supported by the Ministry of Science and Technology of China(No.2016YFA0601302);the National Natural Science Foundation of China(Nos.41776122,42006040);the Taishan Scholars Program of Shandong Province(No.201511014);the Aoshan Talents Program of the Qingdao National Laboratory for Marine Science and Technology(No.2015ASTPOS08)。

摘　　要：The Yellow Sea(YS)and East China Sea(ECS)are important marginal seas of the western Pacific.Understanding the dynamics of methane(CH_(4))in the YS and ECS are essential to evaluate the role of coastal seas in global warming.We measured dissolved CH_(4) at various depths in the water column of the YS and ECS during a cruise from March to April 2017.The concentrations of CH_(4) varied greatly in different water masses,suggesting that the hydrographic conditions can substantially aff ect the CH_(4) distribution.The CH_(4) budget in the shelf of the ECS,which was estimated with a box model,suggests CH_(4) consumption in the water column was the major sink(>95%),followed by a loss with a total of 2.2%CH_(4) released to the atmosphere.Overall a local CH_(4) production of 0.28 nmol/(L·d)was needed to maintain the CH_(4) excess.Results from laboratory incubations showed an increase in CH_(4)(1.5 times higher than the value of the control)after the addition of dimethylsulfoniopropionate(DMSP).Field incubations result in a CH_(4) production rate of 1.2 nmol/(L·d)under a N-stressed conditions(N꞉P<1),indicates that the DMSP-dependent CH_(4) production prefer to occur in the oligotrophic seawaters,where nitrogen is depleted.This study demonstrates that the marginal seas of China is a hotspot for CH_(4) dynamics,and the cycling of methylated sulfur compounds(such as DMSP)may contribute importantly to locally formed CH_(4).This may have further implication to carbon and sulfur biogeochemical cycles in the western Pacific.

关 键 词：METHANE East China Sea Yellow Sea aerobic production dimethylsulfi de(DMS) dimethylsulfoniopropionate(DMSP) 

分 类 号：P734[天文地球—海洋化学]