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Nyamgerel Y, Han Y, Hwang H, Han C, Hong SB, Do Hur S, Lee J. Climate-related variabilities in the Styx-M ice core record from northern Victoria Land, East Antarctica, during 1979-2014. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 935:173319. [PMID: 38777053 DOI: 10.1016/j.scitotenv.2024.173319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 05/13/2024] [Accepted: 05/15/2024] [Indexed: 05/25/2024]
Abstract
The historical climate variability in East Antarctica inferred from ice cores remains under debate owing to the vastness and complexity of the region. This study evaluates the potential climate variabilities in the Styx-M ice core records (δ18O, d-excess, and snow accumulation) from northern Victoria Land adjacent to the Ross Sea sector of East Antarctica during 1979-2014. Results show that the primary moisture source in this area is the Pacific Ocean sector. Although the annual mean δ18O values was limited to directly indicate the temperature changes, a weak relevance between the average δ18O values and the temperature signal during the austral summer season is detectable. δ18O, d-excess, and snow accumulation correlate with sea surface temperature and sea ice extent in the Ross Sea sector. A coupled influence of the SAM, ASL, and ENSO climate indices is expected, because the oceanic environment in this region is influenced by them. The pronounced intrusion of oceanic moisture coupled with atmospheric circulation patterns over the Ross Sea region makes the Styx-M ice core a promising record of the local oceanic conditions, with the snow accumulation rate being a direct proxy. Additionally, the analysis of trace elements from 1979 to 1999 revealed the presence of crustal dust sourced from the Transantarctic Mountains, as well as non-crustal sources, both intricately linked with atmospheric transport. These results demonstrate that the contributions of-and variations in-oceanic conditions associated with atmospheric circulation changes are detectable and dominant in the Styx-M ice core. This study serves as a basis for interpreting longer parts of the Styx-M ice core.
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Affiliation(s)
- Yalalt Nyamgerel
- Department of Science Education, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Yeongcheol Han
- Division of Glacial Environment Research, Korea Polar Research Institute, Incheon 21990, Republic of Korea
| | - Heejin Hwang
- Division of Glacial Environment Research, Korea Polar Research Institute, Incheon 21990, Republic of Korea
| | - Changhee Han
- Earth System Science Research Center, Yonsei University, Seoul 03722, Republic of Korea
| | - Sang-Bum Hong
- Division of Glacial Environment Research, Korea Polar Research Institute, Incheon 21990, Republic of Korea
| | - Soon Do Hur
- Division of Glacial Environment Research, Korea Polar Research Institute, Incheon 21990, Republic of Korea
| | - Jeonghoon Lee
- Department of Science Education, Ewha Womans University, Seoul 120-750, Republic of Korea.
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Lee S, Lee K, Han C, Han Y, Hong SB, Hur SD, Lee S, Chang C, Jung H, Moon J, Boutron CF, Hong S. Recent decline in atmospheric Pb deposition and isotopic constraints on changes in source contributions in snow from northwestern Greenland. CHEMOSPHERE 2023; 345:140441. [PMID: 37844697 DOI: 10.1016/j.chemosphere.2023.140441] [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: 08/24/2023] [Revised: 10/11/2023] [Accepted: 10/12/2023] [Indexed: 10/18/2023]
Abstract
We present lead (Pb) concentrations and isotope ratios in a continuous series of 38 snow samples from a 1.9-m snow pit, covering the period from winter 2012 to summer 2017, at the East Greenland Ice-core Project (EGRIP) ice core drill site in northwestern Greenland. Pb concentrations were highly variable, ranging from 1.53 to 94.9 pg g-1 (mean value of 10.6 pg g-1), with higher concentrations during winter and spring and lower concentrations during summer and fall. Our results show a substantial reduction in the Pb concentration of ∼50% between the 2000s and 2010s, reaching a level close to that observed in the mid-18th century, that is, the time of the Industrial Revolution. Remarkably low radiogenic Pb isotope compositions were observed in our samples compared to previously reported values during the 2000s. The Pb isotope mixing model results indicated a decreasing Chinese contribution from the 2000s onwards, while Europe/Russia emerged as a relatively more important contributor to the anthropogenic Pb input to central Greenland during the corresponding period. Thus, we hypothesized that the reduction in Pb pollution in central Greenland is largely due to a decreasing contribution from Chinese sources in response to the effectiveness of stringent emission control measures in China.
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Affiliation(s)
- Sanghee Lee
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Khanghyun Lee
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Changhee Han
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea; Water Environmental Safety Management Department, Korea Water Resource Corporation, 200 Sintanjin-Ro, Daedeok-Gu, Daejeon, 34350, Republic of Korea
| | - Yeongcheol Han
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Sang-Bum Hong
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Soon Do Hur
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Seungmi Lee
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Chaewon Chang
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Hyejin Jung
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Jangil Moon
- Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, Republic of Korea
| | - Claude F Boutron
- Institut des Géosciences de l'Environnement, Université Grenoble Alpes/CNRS, 54 rue Molière, 38400, Saint Martin d'Hères, France
| | - Sungmin Hong
- Department of Ocean Sciences, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Republic of Korea.
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