Distribution characteristics and implications of mercury in the surface sediments of the East Siberian Arctic Shelf

ZHANG Zhenhu; YAO Zhengquan; HU Limin; Anatolii Astakhov; ZOU Jianjun; LIU Yanguang; WANG Kunshan; YANG Gang; CHEN Zhihua; XIA Yi; LI Qiuling; FENG Han; SHI Xuefa

doi:10.16562/j.cnki.0256-1492.2022071801

2023 Vol. 43, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2023 > 43(1): 49-60

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ZHANG Zhenhu, YAO Zhengquan, HU Limin, Anatolii Astakhov, ZOU Jianjun, LIU Yanguang, WANG Kunshan, YANG Gang, CHEN Zhihua, XIA Yi, LI Qiuling, FENG Han, SHI Xuefa. Distribution characteristics and implications of mercury in the surface sediments of the East Siberian Arctic Shelf[J]. Marine Geology & Quaternary Geology, 2023, 43(1): 49-60. doi: 10.16562/j.cnki.0256-1492.2022071801

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ZHANG Zhenhu, YAO Zhengquan, HU Limin, Anatolii Astakhov, ZOU Jianjun, LIU Yanguang, WANG Kunshan, YANG Gang, CHEN Zhihua, XIA Yi, LI Qiuling, FENG Han, SHI Xuefa. Distribution characteristics and implications of mercury in the surface sediments of the East Siberian Arctic Shelf[J]. Marine Geology & Quaternary Geology, 2023, 43(1): 49-60. doi: 10.16562/j.cnki.0256-1492.2022071801

Distribution characteristics and implications of mercury in the surface sediments of the East Siberian Arctic Shelf

1.
Key laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Pilot National Oceanography Laboratory for Marine Science and Technology, Qingdao 266237, China
3.
College of Marine Geosciences, Key Laboratory of Submarine Geosciences and Prospecting Technology, Ocean University of China, Qingdao 266100, China
4.
V. I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences, Vladivostok 690041, Russia

More Information

Corresponding author: YAO Zhengquan, yaozq@fio.org.cn

Received Date: 18 July 2022

Revised Date: 14 September 2022

Accepted Date: 14 September 2022

Publish Date: 28 February 2023

Abstract

Abstract

Global warming is leading to permafrost degradation, sea-ice melt, increased river runoff, and changes in ocean dynamics in the Arctic region. These factors, plus the increasing human activities, affects the input and transport of mercury in the Arctic Ocean. We analyzed the mercury content in 87 surface sediments (0～2 cm) sampled in the East Siberian Arctic Shelf in the Chukchi Sea, East Siberian Sea, and Laptev Sea during three Sino-Russian Arctic joint expeditions in 2016, 2018, and 2020 at water depth of 9～2546 m. Results show a significant spatial variability in mercury concentration, which can be divided into the nearshore low-mercury zones (33 ng/g), the middle shelf medium-mercury zone (58 ng/g), and the northern deep water high-mercury zone (84 ng/g). In general, the mercury concentration tended to increase with water depth increasing from nearshore toward offshore. Analyses of sediment grain size, total organic carbon, and specific surface area of sediments show that the mercury concentration was positively correlated with the clay content in the surface sediments, indicating the controlling role of sediment grain size in the distribution of mercury. The coarse sediments in the nearshore showed lower mercury concentration due to the influence of river input, coastal erosion, and hydrodynamic sorting, while the fine-grained sediments in the northern shelf are prone to absorb more mercury. There was a strong positive correlation between mercury and total organic carbon in the Chukchi and Laptev Seas, while the correlation was weaker in the East Siberian Sea due probably to more-complexed source of total organic carbon. The enrichment factor of mercury manifests that the overall level of contamination of sedimentary mercury is low at present in the East Siberian Arctic Shelf area, showing relatively weak influence of human activities.
- surface sediments /
- mercury concentrations /
- pollution levels /
- Eastern Siberian Arctic Shelf

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