Methane emission via sediment and water interface in the Bohai Sea, China

Miao Liang , Kunpeng Zang , Gen Zhang , Xuemei Xu , Nan Zheng , Haoyu Xiong , Haixiang Hong , Kai Jiang , Maofa Ge , Yujing Mu , Jianmin Chen , Min Shao , Zifa Wang


Received June 30, 2021,Revised , Accepted August 11, 2021, Available online January 14, 2022

Volume 34,2022,Pages 465-474

Sediment is recognized as the largest reservoir and source of methane (CH4) in the ocean, especially in the shallow coastal areas. To date, few data of CH4 concentration in sediment have been reported in the China shelf seas. In this study, we measured CH4 concentration in sediment and overlying seawater columns, and conducted an incubation experiment in the Bohai Sea in May 2017. CH4 concentration was found to be ranged from 3.075 to 1.795 μmol/L in sediment, which was 2 to 3 orders of magnitude higher than that in overlying seawater columns. The surface sediment was an important source of CH4, while bottom seawater acted as its sink. Furthermore, the net emission rate via sediment water interface (SWI) was calculated as 2.45 μmol/(m2∙day) based on the incubation experiment at station 73, and the earthquake may enhance CH4 release from sediment to seawater column in the eastern Bohai Sea.

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