Climate-driven redox changes in the southern Scotia Sea over the last 35 kyr: Insights from sedimentary sulfur isotope
文献类型：期刊论文
| 作者 | Kim, Jihun7,8; Lim, Dhongil7,8; Jeong, Dohyun8; Kim, Intae7,8; Kim, Haryun7,8; Chang, Tae Soo6; Yoo, Kyu-cheul5; Xu, Zhaokai1,2,3,4 |
| 刊名 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
 |
| 出版日期 | 2024-04-01 |
| 卷号 | 639页码:12 |
| 关键词 | Redox history Sedimentary sulfur isotope Metals Productivity Scotia Sea |
| ISSN号 | 0031-0182 |
| DOI | 10.1016/j.palaeo.2024.112086 |
| 通讯作者 | Lim, Dhongil(oceanlim@kiost.ac.kr) ; Xu, Zhaokai(zhaokaixu@qdio.ac.cn) |
| 英文摘要 | Reconstructing sedimentary redox history provides valuable insights into for understanding of paleoceanographic/paleoclimatic changes in the climatically sensitive Southern Ocean. However, our comprehension of the spatial variations in historical redox changes and the driving forces in the Southern Ocean, especially the Antarctic Zone, remains incomplete. Here, we present detailed sedimentary records of the redox state (i.e., sulfur isotopes), bottom-water oxygenation conditions (i.e., redox-sensitive metals), export production (i.e., 230Thnormalized biogenic opal and barium), and carbon burial flux over the last -35 kyr in the Protector Basin, the deepest basin of the southern Scotia Sea. The studied sediment record in this basin reveals significant variations in geochemical redox proxies throughout the glacial (MIS 2)-interglacial (MIS 1) period, featuring a significant 34S depletion of up to -40 parts per thousand relative to seawater sulfate and a noticeable increase in ERMo/ERU ratio in interglacial sediments. These findings highlight a significant shift in bottom-water and/or sediment oxygenation from glacial oxic to interglacial anoxic/euxinic conditions, primarily driven by climate-induced changes in biogenic productivity, rather than the deep circulation and ventilation dynamics previously emphasized in the Antarctic Zone. Signs of the climate-driven redox change are also evident in two millennial-scale cold events (-9-8 ka and -3-2 ka), marked by sudden shifts toward oxic conditions. Importantly, our results reveal a contrasting scenario to previous observations in the glacial-interglacial redox history within the Antarctic Zone, signifying spatial disparity in bottom-water and sediment redox chemistry. |
| WOS关键词 | GLACIAL-INTERGLACIAL CHANGES ; SULFATE REDUCTION ; ATMOSPHERIC CO2 ; ANTARCTIC PENINSULA ; BIOGENIC BARIUM ; BOTTOM-WATER ; SURFACE-TEMPERATURE ; OCEAN OXYGENATION ; EXPORT PRODUCTION ; HOLOCENE CLIMATE |
| 资助项目 | National Research Foundation of Korea (NRF)[NRF-2021R1I1A205997213] ; National Research Foundation of Korea (NRF)[NRF-2022R1A2C1006208] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[LSKJ202204200] |
| WOS研究方向 | Physical Geography ; Geology ; Paleontology |
| 语种 | 英语 |
| WOS记录号 | WOS:001188369900001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/184869]  |
| 专题 | 中国科学院海洋研究所 |
| 通讯作者 | Lim, Dhongil; Xu, Zhaokai |
| 作者单位 | 1.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 3.Laoshan Lab, Lab Marine Geol, Qingdao 266061, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 5.Korea Polar Res Inst, Incheon 21990, South Korea 6.Kyungpook Natl Univ, Dept Geol, Daegu 41566, South Korea 7.Univ Sci & Technol, Daejeon 34113, South Korea 8.Korea Inst Ocean Sci & Technol, South Sea Res Inst, Geoje 53201, South Korea |
| 推荐引用方式 GB/T 7714 | Kim, Jihun,Lim, Dhongil,Jeong, Dohyun,et al. Climate-driven redox changes in the southern Scotia Sea over the last 35 kyr: Insights from sedimentary sulfur isotope[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2024,639:12. |
| APA | Kim, Jihun.,Lim, Dhongil.,Jeong, Dohyun.,Kim, Intae.,Kim, Haryun.,...&Xu, Zhaokai.(2024).Climate-driven redox changes in the southern Scotia Sea over the last 35 kyr: Insights from sedimentary sulfur isotope.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,639,12. |
| MLA | Kim, Jihun,et al."Climate-driven redox changes in the southern Scotia Sea over the last 35 kyr: Insights from sedimentary sulfur isotope".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 639(2024):12. |
入库方式： OAI收割
来源：海洋研究所
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