Sources and degradation of organic matter in the surface sediments of the Chukchi Sea: insights from amino acids

Weiwei Li; Zhongqiao Li; Zhuoyi Zhu; Alexander Polukhin; Youcheng Bai; Yang Zhang; Futao Fang; Haiyan Jin; Anatolii S. Astakhov; Xuefa Shi; Jianfang Chen

doi:10.1007/s13131-023-2167-9

Volume 42 Issue 11

Nov. 2023

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Article Navigation > Acta Oceanologica Sinica > 2023 > 42(11): 9-18

Weiwei Li, Zhongqiao Li, Zhuoyi Zhu, Alexander Polukhin, Youcheng Bai, Yang Zhang, Futao Fang, Haiyan Jin, Anatolii S. Astakhov, Xuefa Shi, Jianfang Chen. Sources and degradation of organic matter in the surface sediments of the Chukchi Sea: insights from amino acids[J]. Acta Oceanologica Sinica, 2023, 42(11): 9-18. doi: 10.1007/s13131-023-2167-9

Citation:

Weiwei Li, Zhongqiao Li, Zhuoyi Zhu, Alexander Polukhin, Youcheng Bai, Yang Zhang, Futao Fang, Haiyan Jin, Anatolii S. Astakhov, Xuefa Shi, Jianfang Chen. Sources and degradation of organic matter in the surface sediments of the Chukchi Sea: insights from amino acids[J]. Acta Oceanologica Sinica, 2023, 42(11): 9-18. doi: 10.1007/s13131-023-2167-9

Citation:

Weiwei Li, Zhongqiao Li, Zhuoyi Zhu, Alexander Polukhin, Youcheng Bai, Yang Zhang, Futao Fang, Haiyan Jin, Anatolii S. Astakhov, Xuefa Shi, Jianfang Chen. Sources and degradation of organic matter in the surface sediments of the Chukchi Sea: insights from amino acids[J]. Acta Oceanologica Sinica, 2023, 42(11): 9-18. doi: 10.1007/s13131-023-2167-9

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Sources and degradation of organic matter in the surface sediments of the Chukchi Sea: insights from amino acids

doi: 10.1007/s13131-023-2167-9

1.
Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
2.
Shanghai Key Laboratory of Polar Life and Environment Sciences, School of Oceanography, Shanghai Jiao Tong University, Shanghai 200240, China
3.
Key Laboratory for Polar Science of Ministry of Natural Resources, Polar Research Institute of China, Shanghai 201209, China
4.
Laboratory of Biohydrochemistry, Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow 117997, Russia
5.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
6.
V.I.Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690012, Russia
7.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
8.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

Funds: The Open Research Fund of State Key Laboratory of Estuarine and Coastal Research under contract No. SKLEC-KF202109; the National Natural Science Foundation of China under contract Nos 42076242, 41906200, 41941013, and 42176039; the National Key Research and Development Program of China under contract No. 2019YFE0120900; the Oceanic Interdisciplinary Program of Shanghai Jiao Tong University under contract No. SL2021MS020; the Shanghai Pilot Program for Basic Research—Shanghai Jiao Tong University under contract No. 21TQ1400201; the Shanghai Frontiers Science Center of Polar Science under contract No. SCOPS; the Ministry of Sciences and Education of the Russian Federation under contract No. project 121021700342-9.

More Information

Corresponding author: E-mail: lizq@sio.org.cn
Received Date: 2022-09-01
Accepted Date: 2022-12-30

Available Online: 2024-01-03

Publish Date: 2023-11-01

Abstract

Abstract

In the context of global warming and rapid environment change in the Arctic, the supply of organic matter (OM) has increased significantly and a large amount of OM are buried on the Arctic shelf. Studying the fate of OM in Arctic shelf sediments is crucial to understanding the global carbon sink. As a marginal sea of the Arctic Ocean, the Chukchi Sea is one of the most critical areas where OM is buried. Based on the surface sediment samples collected during the sixth Chinese National Arctic Research Expedition in the summer of 2014 and the Sino-Russian joint Arctic Research Expedition in the summer of 2016, this study takes amino acids (AAs) as the primary tool to explore the source and degradation of OM in the surface sediments of the Chukchi Sea. This study shows that total hydrolyzable amino acid (THAA) concentrations (dry weight) are high, with a mean value of (32.7 ± 15.8) μmol/g. Their spatial distribution is related to primary productivity, hydrodynamic conditions, sediment properties and other factors. The source of OM in the surface sediments of the Chukchi Sea is dominated by diatom-dominated marine productivity, with some input from terrestrial sources. Bacteria, as the main source of the D-enantiomer of AA (D-AA), not only have transforming effect on OM, but their cell walls and remnants likewise supply the OM pool. Based on a series of diagenetic indicators, we conclude that the OM in the surface sediments of the Chukchi Sea has undergone extensive degradation [DI (degradation index) = −0.59 ± 0.44], and the degradation degree in the slope is higher than that in the shelf. This study uses AA to explore the sources and degradation of OM in the sediments of the Chukchi Sea, which facilitates our understanding of OM transport and transformation on the Arctic shelf.
- Chukchi Sea,
- amino acids,
- degradation indicator,
- organic matter

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References(82)

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