Distribution,burial fluxes and carbon sink effect of sedimentary organic carbon in the eastern China seas

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外文摘要：The ocean is the largest active carbon reservoir on Earth.Organic carbon(OC),as the primary species of carbon sequestration in the ocean,plays an important role in the global carbon cycle through its deposition and burial.In this study,sedimentary OC data from 5796 stations,together with relevant geochemical and sedimentological parameters in the Bohai Sea,Yellow Sea,and East China Sea(BYES)were used to summarize and elucidate the distribution and burial patterns of sedi-mentary OC,and assess carbon sink effect of sedimentary OC burial.The results show that the OC content in the sediments of the BYES ranges from 0.00％to 2.12％,with an average content of 0.47％士0.26％.OC content is significantly correlated with fine-grained sediments,with an average OC content in mud areas being 39％higher than that in non-mud areas.Modern OC buried in the BYES are mainly deposited in 7 major mud areas,with a total sedimentary OC burial flux of approximately 8.20 Mt C yr-1.Among them,the burial flux of biospheric OC is 6.92 Mt C yr-1,equivalent to the OC consumption amount of silicate weathering of the 9 major river basins in the eastern China.In its natural state,the annually sequestered OC in the sediments of the eastern China seas is equivalent to 25.37 Mt of atmospheric CO2,indicating a significant carbon sink effect.The distribution and burial of terrigenous OC in the BYES are mainly influenced by the large river inputs and complex marine hydrodynamic environment,while human activities such as dam construction have significantly altered the OC burial in these coastal mud areas.

外文关键词：

Sedimentary organic carbonBurial fluxCarbon sink effectCarbon cycleEastern China seas

作者：

Xuefa SHI、Bin WU、Shuqing QIAO、Zhengquan YAO、Limin HU、Yazhi BAI、Shan HU、Jie SHENG、Yanguang LIU、Shengfa LIU、Kunshan WANG、Jianjun ZOU

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作者单位：

Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China

Laboratory for Marine Geology,Qingdao Marine Science and Technology Center,Qingdao 266237,China

Key Laboratory of Deep Sea Mineral Resources Development,Shandong Province(Preparatory),Qingdao 266061,China

Key Laboratory of Submarine Geosciences and Technology,College of Marine Geosciences,Ocean University of China,Qingdao 266100,China

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出版年：

2024

DOI：

10.1007/s11430-024-1412-0

中国科学:地球科学(英文版)

中国科学院

中国科学:地球科学(英文版)

影响因子：1.002

ISSN：1674-7313

年,卷(期)：2024.67(10)