1
|
Lin Y, Wu Z, Ke H, Chen H, Xu Y, Lin J, Liu Y, Xu F, Huang D, Wang Y, Li T, Cai M. Heavy metals and Pb isotopes in sediment cores from the Bering and Chukchi seas: Implications for environmental changes and human activities over the past century. MARINE ENVIRONMENTAL RESEARCH 2023; 191:106129. [PMID: 37586223 DOI: 10.1016/j.marenvres.2023.106129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 08/07/2023] [Accepted: 08/08/2023] [Indexed: 08/18/2023]
Abstract
The Bering Sea and the Chukchi Sea are important regions for marine ecosystems and climate change. However, the historical deposition and sources of metals in these regions are poorly understood. In this study, we utilized Pb isotopes and multi-element concentrations (Ni, Cu, Fe, Mn, Zn, Cd, Pb) coupled with Pb-210 dating to investigate the historical deposition and source identification of metals in sediment cores collected from the Bering Sea and the Chukchi Sea. Our findings reveal that the transport of organic matter was mainly transported by marine and terrestrial sources in the Bering and Chukchi Sea, respectively. Historical variations of metals were similar in both seas, showing an increasing trend of metals (excluding Mn) from the 1960s to the 1990s, followed by a gradual decrease after the 1990s, which can be attributed to the development of industrial and gasoline emission. The results of the geo-accumulation index indicated that sediment in both seas was relatively unpolluted with metals. Additionally, Pb isotopic ratios suggested that natural weathering was the primary source of Pb in the area, but the use and phase-out of gasoline were also well-reconstructed. This study provides valuable information for assessing environmental changes and human activities over the past century in the Arctic and subarctic Ocean.
Collapse
Affiliation(s)
- Yan Lin
- School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361021, China; Xiamen Key Laboratory of Membrane Research and Application, Xiamen 361024, China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China; Key Laboratory of Marine Chemistry and Application Technology, Xiamen University, Xiamen 361102, China; College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
| | - Zhai Wu
- State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China; Key Laboratory of Marine Chemistry and Application Technology, Xiamen University, Xiamen 361102, China; College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
| | - Hongwei Ke
- State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China; Key Laboratory of Marine Chemistry and Application Technology, Xiamen University, Xiamen 361102, China; College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
| | - Huorong Chen
- The Monitoring Center of Marine Environment and Fishery Resources, Fuzhou 350003, China
| | - Ye Xu
- Key Laboratory of Marine Chemistry and Application Technology, Xiamen University, Xiamen 361102, China
| | - Jin Lin
- The Third Institute of Oceanography Ministry of Natural Resources, Xiamen 361005, China
| | - Yanguang Liu
- College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
| | - Fangjian Xu
- The First Institute of Oceanography Ministry of Natural Resources, Qingdao 266061, China
| | - Dongren Huang
- University of Petroleum, Institute of Earth Resources and Information, Qingdao 266555, China
| | - Yi Wang
- College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
| | - Tianyao Li
- College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China
| | - Minggang Cai
- Key Laboratory of Marine Chemistry and Application Technology, Xiamen University, Xiamen 361102, China; College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China; The Monitoring Center of Marine Environment and Fishery Resources, Fuzhou 350003, China.
| |
Collapse
|
2
|
Kim D, Aksentov K, Astakhov A, Sattarova V, Ivanov M, Alatorsev A, Obrezkova M, Selutin S. Geochemistry aspects of modern mercury accumulation in bottom sediments from the south-western Chukchi Sea. MARINE POLLUTION BULLETIN 2023; 189:114768. [PMID: 36863272 DOI: 10.1016/j.marpolbul.2023.114768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 02/16/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Mercury (Hg) having a high migration capacity reach the Arctic region via the atmosphere. The absorbers for Hg are sea bottom sediments. Sedimentation in the Chukchi Sea occurs under the influence of highly productive Pacific waters entering through the Bering Strait and the inflow of a terrigenous component from the western direction with the Siberian Coastal Current. The Hg concentrations ranged from 12 μg kg-1 to 39 μg kg-1 in bottom sediments of study polygon. Based on dating sediment core the background concentration was 29 μg kg-1. Concentration of Hg in fine sediment fractions was 82 μg kg-1, in sandy fractions (>63 μm) varied from 8 to12 μg kg-1. In recent decades the Hg accumulation in bottom sediments has been controlled by the biogenic component. The Hg in the studied sediments presents as sulfide form.
Collapse
Affiliation(s)
- David Kim
- V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
| | - Kirill Aksentov
- V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia.
| | - Anatolii Astakhov
- V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
| | | | - Maksim Ivanov
- V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
| | | | - Mariia Obrezkova
- V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
| | - Semen Selutin
- V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
| |
Collapse
|