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Carbon budget of methane seepages in the Haiyang 4 Area in the northern slope of the South China sea

文献类型：期刊论文

作者Liu, Lihua1; Haeckel, Matthias2; Wu, Xueting3,4; Schmidt, Mark2; Xu, Xing5; Wu, Nengyou6,7
刊名GAS SCIENCE AND ENGINEERING
出版日期2024-08-01
卷号128页码:9
关键词Methane seepage Carbon cycle Carbon sequestration Interstitial solutes Authigenic minerals
ISSN号2949-9097
DOI10.1016/j.jgsce.2024.205398
通讯作者Liu, Lihua(liulh@ms.giec.ac.cn)
英文摘要Methane seepage records information of the local carbon cycle with respect to the generation, consumption and sequestration of carbon. Here presents the investigation of 7 gravity cores retrieved in 2004 during cruise SO-177 in the Haiyang 4 Area at the northern slope of the South China Sea. Porewater solutes, sulfate, methane, total alkalinity, sulfide and calcium demonstrate currently the weak seep activity. Local carbon cycling and sequestration is also revealed, that dominates by anaerobic oxidation of biogenic methane to dissolved bicarbonate inducing calcium carbonate and iron sulfide minerals (mainly pyrite) precipitation. A reactive transport model was employed to quantify the carbon cycle and budget. Model results show that current methane fluxes contribute to less than 2 wt % of authigenic carbonates and 2 wt % iron sulfide minerals being precipitated in 600-800 cm sediment depth. The sequestration of carbon could be > 50 mmol C cm(-2) yr(-1) under in situ condition. The observed increase of carbonate and iron sulfide minerals at similar to 100 cm, however, require higher methane fluxes to shift the zone of anaerobic oxidation of methane upwards to around 1 m below the seafloor, which have occurred during sea level low stands in the geological past. The oscillation of seepage flux contributed to the formation of multiple layers of authigenic carbonates and pyrite, which indicates the high capability of carbon sink and is speculated to be induced by the dissociation of the underlying hydrates triggered by sea level drop and or temperature increase.
WOS关键词125 DEGREES-C ; THERMODYNAMIC PROPERTIES ; AUTHIGENIC CARBONATES ; ANAEROBIC OXIDATION ; SULFATE REDUCTION ; AQUEOUS-SOLUTIONS ; PYRITE FORMATION ; HYDRATE RIDGE ; H2S OXIDATION ; FLUID SOURCES
资助项目National Natural Science Foundation of China[41776071] ; National Natural Science Foundation of China[42276086] ; Helmholtz-Chinese Academy of Sciences Joint Research Group initiative[HCJRG-208] ; External Cooperation Program of the Chinese Academy of Sciences[GJHZ1404]
WOS研究方向Energy & Fuels ; Engineering
语种英语
WOS记录号WOS:001265569000001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; Helmholtz-Chinese Academy of Sciences Joint Research Group initiative ; External Cooperation Program of the Chinese Academy of Sciences
源URL[http://ir.giec.ac.cn/handle/344007/42309]  
专题中国科学院广州能源研究所
通讯作者Liu, Lihua
作者单位1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
2.GEOMAR Helmholtz Ctr Ocean Res Kiel, D-24148 Kiel, Germany
3.State Ocean Adm, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China
4.State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Peoples R China
5.Guangzhou Marine Geol Survey, Guangzhou 510760, Peoples R China
6.Minist Land & Resources, Qingdao Inst Marine Geol, Key Lab Gas Hydrate, Qingdao 266071, Peoples R China
7.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Lihua,Haeckel, Matthias,Wu, Xueting,et al. Carbon budget of methane seepages in the Haiyang 4 Area in the northern slope of the South China sea[J]. GAS SCIENCE AND ENGINEERING,2024,128:9.
APA Liu, Lihua,Haeckel, Matthias,Wu, Xueting,Schmidt, Mark,Xu, Xing,&Wu, Nengyou.(2024).Carbon budget of methane seepages in the Haiyang 4 Area in the northern slope of the South China sea.GAS SCIENCE AND ENGINEERING,128,9.
MLA Liu, Lihua,et al."Carbon budget of methane seepages in the Haiyang 4 Area in the northern slope of the South China sea".GAS SCIENCE AND ENGINEERING 128(2024):9.

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来源：广州能源研究所

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