中国东部海域沉积有机碳的分布、埋藏通量和碳汇效应

IF 6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
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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引用次数: 0

摘要

海洋是地球上最大的活性碳库。有机碳(OC)作为海洋固碳的主要物种,通过沉积和埋藏在全球碳循环中发挥着重要作用。本研究利用渤海、黄海和东海(BYES)5796 个站位的沉积 OC 数据以及相关地球化学和沉积学参数,总结并阐明了沉积 OC 的分布和埋藏规律,评估了沉积 OC 埋藏的碳汇效应。结果表明,东海和南海沉积物中 OC 含量介于 0.00%~2.12% 之间,平均含量为 0.47%±0.26%。OC 含量与细粒沉积物有明显的相关性,泥质区域的 OC 平均含量比非泥质区域高 39%。埋藏在毕兹河中的现代 OC 主要沉积在 7 个主要泥区,沉积 OC 总埋藏通量约为 8.20 Mt C yr-1。其中,生物圈 OC 埋藏通量为 6.92 百万吨 C/年-1,相当于中国东部 9 大流域硅酸盐风化消耗的 OC 量。在自然状态下,中国东部海域沉积物中每年封存的 OC 相当于大气中的 2537 万吨 CO2,显示出显著的碳汇效应。陆源 OC 在 BYES 中的分布和埋藏主要受大量河流输入和复杂的海洋水动力环境的影响,而大坝建设等人类活动极大地改变了这些沿岸泥区的 OC 埋藏。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Distribution, burial fluxes and carbon sink effect of sedimentary organic carbon in the eastern China seas

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 sedimentary 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%±0.26%. OC content is significantly correlated with finegrained 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.

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来源期刊
Science China Earth Sciences
Science China Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
9.60
自引率
5.30%
发文量
135
审稿时长
3-8 weeks
期刊介绍: Science China Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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