Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes

Renming Jia; Xinyue Mu; Min Chen; Jing Zhu; Bo Wang; Xiaopeng Li; A S Astakhov; Minfang Zheng; Yusheng Qiu

doi:10.1007/s13131-020-1650-9

Volume 39 Issue 9

Sep. 2020

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Article Navigation > Acta Oceanologica Sinica > 2020 > 39(9): 96-108

Renming Jia, Xinyue Mu, Min Chen, Jing Zhu, Bo Wang, Xiaopeng Li, A S Astakhov, Minfang Zheng, Yusheng Qiu. Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes[J]. Acta Oceanologica Sinica, 2020, 39(9): 96-108. doi: 10.1007/s13131-020-1650-9

Citation:

Renming Jia, Xinyue Mu, Min Chen, Jing Zhu, Bo Wang, Xiaopeng Li, A S Astakhov, Minfang Zheng, Yusheng Qiu. Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes[J]. Acta Oceanologica Sinica, 2020, 39(9): 96-108. doi: 10.1007/s13131-020-1650-9

Citation:

Renming Jia, Xinyue Mu, Min Chen, Jing Zhu, Bo Wang, Xiaopeng Li, A S Astakhov, Minfang Zheng, Yusheng Qiu. Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes[J]. Acta Oceanologica Sinica, 2020, 39(9): 96-108. doi: 10.1007/s13131-020-1650-9

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Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes

doi: 10.1007/s13131-020-1650-9

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
2.
V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia

Funds: The National Natural Science Foundation of China under contract No. 41721005; the China Ocean Mineral Resources R&D Association (COMRA) Program under contract No. DY135-E2-2-03; the Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology under contract No. 2018SDKJ0104-3; the Ministry of Science and Education of Russia Project under contract No. АААА-А17-117030110033-0.

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Corresponding author: E-mail: mchen@xmu.edu.cn
Received Date: 2019-07-17
Accepted Date: 2019-11-06

Available Online: 2020-12-28

Publish Date: 2020-09-25

Abstract

Abstract

The stable isotopic composition (δ¹³C and δ¹⁵N) and carbon/nitrogen ratio (C/N) of particulate organic matter (POM) in the Chukchi and East Siberian shelves from July to September, 2016 were measured to evaluate the spatial variability and origin of POM. The δ¹³C_POC values were in the range of −29.5‰ to −17.5‰ with an average of −25.9‰±2.0‰, and the δ¹⁵N_PN values ranged from 3.9‰ to 13.1‰ with an average of 8.0‰±1.6‰. The C/N ratios in the East Siberian shelf were generally higher than those in the Chukchi shelf, while the δ¹³C and δ¹⁵N values were just the opposite. Abnormally low C/N ratios (<4), low δ¹³C_POC (almost −28‰) and high δ¹⁵N_PN (>10‰) values were observed in the Wrangel Island polynya, which was attributed to the early bloom of small phytoplankton. The contributions of terrestrial POM, bloom-produced POM and non-bloom marine POM were estimated using a three end-member mixing model. The spatial distribution of terrestrial POM showed a high fraction in the East Siberian shelf and decreased eastward, indicating the influence of Russian rivers. The distribution of non-bloom marine POM showed a high fraction in the Chukchi shelf with the highest fraction occurring in the Bering Strait and decreased westward, suggesting the stimulation of biological production by the Pacific inflow in the Chukchi shelf. The fractions of bloom-produced POM were highest in the winter polynya and gradually decreased toward the periphery. A negative relationship between the bloom-produced POM and the sea ice meltwater inventory was observed, indicating that the net sea ice loss promotes early bloom in the polynya. Given the high fraction of bloom-produced POM, the early bloom of phytoplankton in the polynyas may play an important role on marine production and POM export in the Arctic shelves.
- particulate organic matter,
- carbon isotope,
- nitrogen isotope,
- Chukchi Shelf,
- East Siberian Shelf,
- polynya

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References(88)

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