Quantitative assessment of dissolved inorganic carbon cycling in marine sediments from gas hydrate-bearing areas in the South China Sea
Quantitative assessment of dissolved inorganic carbon cycling in marine sediments from gas hydrate-bearing areas in the South China Sea
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南海天然气水合物区海洋沉积物中溶解无机碳循环的定量评估
DOI：
10.1016/j.marpetgeo.2022.105881
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发表时间：
2022-08
影响因子：
4.2
通讯作者：
Yunxin Fang
中科院分区：
文献类型：
--
作者：
Rihuan Zha;Tao Yang;Xiaoqing Shi;Pibo Su;Yunxin Fang
定量评估富含甲烷的海洋沉积物中的溶解无机碳（DIC）循环对于了解不同碳源对全球碳循环的贡献至关重要。本文利用δ 13 C-DIC、SO 4 2− 、DIC、Ca 2+ 、Mg 2+ 、PO 4 3− 数据和反应输运模型，对琼东南盆地西沙海槽（CL27A）和海马冷泉（CL44）以西两个甲烷渗漏点浅层沉积物中的DIC和甲烷来源进行了分析和DIC收支计算。模型结果显示，甲烷通过甲烷厌氧氧化 (AOM) 贡献了 92.75% 和 79.95% 的 DIC 来源，而在这两个地点，通过碎屑硫酸盐还原 (OSR) 和产甲烷作用的有机物仅贡献了 7.25% 和 12.90%。然而，两个地点的甲烷来源各不相同。与同期有机物沉积分离的外部热成因甲烷驱动 CL27A 的 AOM。向上扩散的外部生物甲烷和原位产甲烷作用产生的内部甲烷的组合驱动着 CL44 的 AOM。深度内部甲烷通量揭示了深层产甲烷带影响 CL44 浅层沉积物的 DIC 循环。它伴随着向上扩散的 DIC 通量，建模时可以通过 δ 13 C-DIC 数据识别，这贡献了剩余的 7.15% 的 DIC 源。忽略在下边界设置为固定值的 DIC 源将会误解浅层沉积物中的 DIC 循环。这项研究确定并强调了外部热成甲烷和产甲烷带对海洋沉积物中 DIC 循环的影响，并证明准确评估富含甲烷的海洋沉积物中的 DIC 循环对于估计其对海洋碳循环的贡献非常重要。 • 接近有机质δ 13 C 的δ 13 C-DIC 最小值与外部热成因甲烷有关。 • 忽视向上富含13 C的DIC通量将会误解浅海沉积物中的DIC循环。 • δ 13 C-DIC 数据可以在建模中识别向上的富含 13 C DIC 通量。
Quantitatively assessing dissolved inorganic carbon (DIC) cycling in methane-rich marine sediments is essential for understanding the contributions of different carbon sources to the global carbon cycle. Here, the data of δ 13 C-DIC, SO 4 2− , DIC, Ca 2+ , Mg 2+ , PO 4 3− , and a reactive transport model were used to analyze the DIC and methane source and calculate the DIC budget in the shallow sediments at two methane seep sites in the Xisha Trough (CL27A) and to the west of the Haima cold seeps in the Qiongdongnan Basin (CL44). Model results show that methane contributed to 92.75% and 79.95% of DIC sources through anaerobic oxidation of methane (AOM) versus only 7.25% and 12.90% by organic matter via organoclastic sulfate reduction (OSR) and methanogenesis at both sites. However, the methane sources vary between the two sites. External thermogenic methane that is decoupled from contemporaneous organic matter deposition drives the AOM at CL27A. A combination of upwardly diffusing external biogenic methane and internal methane derived from in situ methanogenesis drives the AOM at CL44. Internal methane flux from depth reveals the deep methanogenic zone influences the DIC cycling in the shallow sediments at CL44. It is accompanied by the upward diffusive DIC flux that can be identified by the δ 13 C-DIC data when modeling, which contributes to the remaining 7.15% of the DIC source. Neglecting this DIC source that is set as a fixed value at the lower boundary will misunderstand the DIC cycling in the shallow sediments. This study identified and highlighted the influence of external thermogenic methane and the methanogenic zone on the DIC cycling in marine sediments, and demonstrated assessing DIC cycling accurately in methane-rich marine sediments is important to estimate its contribution to oceanic carbon cycling. • The δ 13 C-DIC minimum approaching the δ 13 C of organic matter is related to external thermogenic methane. • Neglecting upward 13 C-rich DIC flux will misunderstand the DIC cycling in shallow marine sediments. • The δ 13 C-DIC data can identify the upward 13 C-rich DIC flux in modeling.
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影响因子：
3.7
作者：
D. Burdige;T. Komada
通讯作者：
D. Burdige;T. Komada
DOI：
--
发表时间：
2005
期刊：
Marine Geology & Quaternary Geology
影响因子：
--
作者：
Wang Hong-yu;Su Chunyan;Zhang Hong-bo;Niu Binhua
通讯作者：
Wang Hong-yu;Su Chunyan;Zhang Hong-bo;Niu Binhua
DOI：
10.1016/j.dsr2.2007.04.001
发表时间：
2007-06
影响因子：
3
作者：
G. Snyder;A. Hiruta;R. Matsumoto;G. Dickens;H. Tomaru;R. Takeuchi;J. Komatsubara;Yasushi Ishida
通讯作者：
G. Snyder;A. Hiruta;R. Matsumoto;G. Dickens;H. Tomaru;R. Takeuchi;J. Komatsubara;Yasushi Ishida
南海北部神狐海域沉积物孔隙水中溶解无机碳(DIC)及其碳同位素组成
影响因子：
2.3
作者：
Yang, Jing-Hong;Wu, Neng-You;Liu, Jian;Yang, Tao;Jiang, Shao-Yong;Chen, Dao-Hua;Lu, Ge
通讯作者：
Lu, Ge
影响因子：
5
作者：
T. Komada;D. Burdige;Huan Li;C. Magen;J. Chanton;A. K. Cada
通讯作者：
T. Komada;D. Burdige;Huan Li;C. Magen;J. Chanton;A. K. Cada