Climate-driven redox changes in the southern Scotia Sea over the last 35 kyr: Insights from sedimentary sulfur isotope

doi:10.1016/j.palaeo.2024.112086

IOCAS-IR

	Climate-driven redox changes in the southern Scotia Sea over the last 35 kyr: Insights from sedimentary sulfur isotope
	Kim, Jihun 1,2; Lim, Dhongil 1,2; Jeong, Dohyun 1; Kim, Intae 1,2; Kim, Haryun 1,2; Chang, Tae Soo 3; Yoo, Kyu-cheul 4; Xu, Zhaokai 5,6,7,8
	2024-04-01
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
卷号	639 页码:12
通讯作者	Lim, Dhongil(oceanlim@kiost.ac.kr) ; Xu, Zhaokai(zhaokaixu@qdio.ac.cn)
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.
关键词	Redox history Sedimentary sulfur isotope Metals Productivity Scotia Sea
DOI	10.1016/j.palaeo.2024.112086
收录类别	SCI
语种	英语
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
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:001188369900001
出版者	ELSEVIER
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
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/184870
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.Korea Inst Ocean Sci & Technol, South Sea Res Inst, Geoje 53201, South Korea 2.Univ Sci & Technol, Daejeon 34113, South Korea 3.Kyungpook Natl Univ, Dept Geol, Daegu 41566, South Korea 4.Korea Polar Res Inst, Incheon 21990, South Korea 5.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 6.Laoshan Lab, Lab Marine Geol, Qingdao 266061, Peoples R China 7.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 8.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
通讯作者单位	中国科学院海洋研究所
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.