楚科奇海百年尺度冻土有机碳的埋藏及其对气候变化的响应

武倩倩; 李中乔; 张松; 任健; 白有成; 季仲强; 李宏亮; 金海燕; 陈建芳

doi:10.12284/hyxb2024112

楚科奇海百年尺度冻土有机碳的埋藏及其对气候变化的响应

doi: 10.12284/hyxb2024112

武倩倩^{1, 2,},
李中乔^{1, 2, ,},
张松^{1, 2},
任健^{1, 2},
白有成^{1, 2},
季仲强^{1, 2},
李宏亮^{1, 2, 3},
金海燕^{1, 2},
陈建芳^{1, 2, 4}

1.
自然资源部第二海洋研究所，浙江杭州 310012
2.
自然资源部海洋生态系统动力学重点实验室，浙江杭州 310012
3.
南方海洋科学与工程广东实验室（珠海），广东珠海 519000
4.
自然资源部第二海洋研究所卫星海洋环境动力学国家重点实验室，浙江杭州 310012

基金项目: 国家自然科学基金（U23A203，42076242）；全球变化与海气相互作用II期（GASI-04-HYST-06）；上海交通大学深蓝计划（SL2023MS019）。

详细信息

作者简介:
武倩倩（ 1998— ），女，安徽省阜阳市人，主要从事海洋生物地球化学研究。E-mail：wuqq525@163.com

通讯作者:
李中乔（1984—），男，副研究员，主要从事海洋生物地球化学研究。E-mail：lizq@sio.org.cn

中图分类号: P736.21
计量
- 文章访问数: 138
- HTML全文浏览量: 62
- PDF下载量: 40
- 被引次数: 0
出版历程
- 收稿日期: 2024-05-23
- 录用日期: 2024-08-12
- 修回日期: 2024-05-31
- 网络出版日期: 2024-08-13
- 刊出日期: 2024-09-01

The burial of permafrost organic carbon in the Chukchi Sea and its response to climate change in the past 200 years

Wu Qianqian^{1, 2
,},
Li Zhongqiao^{1, 2
, ,},
Zhang Song^{1, 2},
Ren Jian^{1, 2},
Bai Youcheng^{1, 2},
Ji Zhongqiang^{1, 2},
Li Hongliang^{1, 2, 3},
Jin Haiyan^{1, 2},
Chen Jianfang^{1, 2, 4}

1.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
2.
Key Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, China
3.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
4.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

摘要

摘要: 在全球变暖的背景下，北极出现了冻土退化、夏季海冰减少、陆地径流输入增加和沿岸侵蚀加剧等一系列变化。随着全球变暖，封存于冻土中的有机碳（Organic Carbon，OC）正在向海加速迁移和释放，这将影响北冰洋的碳循环的格局，但目前鲜有证据能直接证实这一推论。本文通过分析楚科奇海两根百年尺度沉积岩芯的木质素和碳同位素，讨论了其所埋藏的有机质的来源和剖面变化情况。结果显示楚科奇海柱状沉积物中的有机碳来源于陆生C3植物的草本组织和海洋源生产的混合贡献；沉积物中木质素的绝对含量Σ8呈现上升趋势，证明随着全球变暖，更多的陆源物质被输运到楚科奇海。本研究表明人类活动引起的全球变暖确实增加了冻土有机碳向海的迁移，陆源输入增强导致的木质素含量增加是百年尺度下全球变暖导致冻土融化增强的直接证据。
- 北极 /
- 全球变暖 /
- 冻土 /
- 木质素 /
- 有机碳 /
- 楚科奇海
Abstract: Against the backdrop of global warming, the Arctic has experienced a series of changes, including permafrost degradation, reduced summer sea ice, increased land runoff, and intensified coastal erosion. With global warming, organic carbon (OC) stored in permafrost is accelerating its migration and release to the sea, which will affect the pattern of carbon cycling in the Arctic Ocean. However, there is currently little evidence to directly confirm this inference. This article analyzes the lignin and carbon isotopes of two hundred year scale sedimentary cores in the Chukchi Sea, and discusses the sources and profile changes of the buried organic matter. The results showed that the organic carbon in the columnar sediments of the Chukchi Sea came from a mixed contribution of herbaceous tissue of terrestrial C3 plants and marine source production. The absolute content of lignin Σ8 in sediment shows an overall upward trend, indicating that with global warming, more terrestrial materials are being transported to the Chukchi Sea. This study indicates that global warming caused by human activities has indeed increased the migration of organic carbon from permafrost to the sea, and the increase in lignin content due to enhanced terrestrial inputs is direct evidence of the enhanced melting of permafrost caused by global warming on a century scale.
- Arctic /
- global warming /
- permafrost /
- lignin /
- organic carbon /
- Chukchi Sea

HTML全文

图 1 楚科奇海R1和C07沉积岩芯采样点

Fig. 1 Sampling stations for cores of R1 and C07 in Chukchi Sea

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图 2 楚科奇海R1、C07沉积岩芯TOC（%）、δ¹³C（‰）、OC_T%、OC_M%随沉积年代变化的分布趋势

Fig. 2 Distribution trend of TOC (%), δ¹³C (‰), OC_T%, in sedimentary cores and OC_M% of R1 and C07 in Chukchi Sea with changes in sedimentary age

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图 3 楚科奇海R1和C07沉积岩芯相关参数，包括Σ8[mg/(10 g)]dw、Λ8[mg/(100 mg)]OC、V[mg/(10 g)]dw、S[mg/(10 g)]dw、C[mg/(10 g)]dw、DHBA[mg/(100 mg)]OC、LPVI

Fig. 3 Relevant parameters of R1 and C07 sedimentary cores in Chukchi Sea, including Σ8[mg/(10 g)]dw, Λ8[mg/(100 mg)]OC, V[mg/(10 g)]dw, S[mg/(10 g)]dw, C[mg/(10 g)]dw, DHBA[mg/(100 mg)]OC, LPVI

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图 4 楚科奇海R1和C07沉积岩芯木质素参数S/V、C/V比值分布情况

a. 被子植物木本植物，b. 被子植物草本组织，c. 裸子植物木本组织，d. 裸子植物草本组织

Fig. 4 Distribution of S/V and C/V ratios of lignin parameters in sediment cores of R1 and C07 in Chukchi Sea

a. Woody plants of angiosperms, b. herbaceous tissues of angiosperms, c. woody tissues of gymnosperms, d. herbaceous tissues of gymnosperms

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图 5 楚科奇海R1、C07沉积岩芯Λ8[mg/(100 mg)]OC和δ¹³C（‰）的来源分析

Fig. 5 Source analysis of Λ8[mg/(100 mg)]OC and δ¹³C(‰) of R1 and C07 sedimentary cores in the Chukchi Sea

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