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

WU Qianqian; LI Zhongqiao; ZHANG Song; REN Jian; BAI Youcheng; JI Zhongqiang; LI Hongliang; JIN Haiyan; CHEN Jianfang

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WU Qianqian，LI Zhongqiao，ZHANG Song, et al. The burial of permafrost organic carbon in the Chukchi Sea and its response to climate change in the past 200 years[J]. Haiyang Xuebao，2024, 46(x)：1–9

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

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

Received Date: 2024-05-23
Accepted Date: 2024-08-12
Rev Recd Date: 2024-05-31

Available Online: 2024-08-13

Abstract

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

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References(36)

References

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