气候变化领域集成服务门户(CCPortal): Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years

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DOI	10.1038/s41467-021-24264-9
	Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years
	Wu, Shuzhuang; Lembke-Jene, Lester; Lamy, Frank; Arz, Helge W.; Nowaczyk, Norbert; Xiao, Wenshen; Zhang, Xu; Hass, H. Christian; Titschack, Juergen; Zheng, Xufeng; Liu, Jiabo; Dumm, Levin; Diekmann, Bernhard; Nuernberg, Dirk; Tiedemann, Ralf; Kuhn, Gerhard
通讯作者	Wu, SZ (通讯作者)
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	The Antarctic Circumpolar Current (ACC) plays a crucial role in global ocean circulation by fostering deep-water upwelling and formation of new water masses. On geological time-scales, ACC variations are poorly constrained beyond the last glacial. Here, we reconstruct changes in ACC strength in the central Drake Passage in vicinity of the modern Polar Front over a complete glacial-interglacial cycle (i.e., the past 140,000 years), based on sediment grain-size and geochemical characteristics. We found significant glacial-interglacial changes of ACC flow speed, with weakened current strength during glacials and a stronger circulation in interglacials. Superimposed on these orbital-scale changes are high-amplitude millennial-scale fluctuations, with ACC strength maxima correlating with diatom-based Antarctic winter sea-ice minima, particularly during full glacial conditions. We infer that the ACC is closely linked to Southern Hemisphere millennial-scale climate oscillations, amplified through Antarctic sea ice extent changes. These strong ACC variations modulated Pacific-Atlantic water exchange via the cold water route and potentially affected the Atlantic Meridional Overturning Circulation and marine carbon storage. How the Antarctic Circumpolar Current (ACC) changed on glacial-interglacial time scales is not well known. Here, the authors present a 140,000 year long sediment record from the Drake passage and show both glacial-interglacial as well as millennial-scale variability which are linked to Atlantic variability and marine carbon storage.
关键词	MERIDIONAL OVERTURNING CIRCULATION LAST GLACIAL MAXIMUM WESTERLY WIND CHANGES NORTH-ATLANTIC OCEAN SOUTHERN-OCEAN SEA-ICE CLIMATE VARIABILITY TERRIGENOUS SEDIMENT TRANSPORT WATER
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000669490300003
来源期刊	NATURE COMMUNICATIONS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260540
推荐引用方式 GB/T 7714	Wu, Shuzhuang,Lembke-Jene, Lester,Lamy, Frank,et al. Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years[J]. 中国科学院青藏高原研究所,2021,12(1).
APA	Wu, Shuzhuang.,Lembke-Jene, Lester.,Lamy, Frank.,Arz, Helge W..,Nowaczyk, Norbert.,...&Kuhn, Gerhard.(2021).Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years.NATURE COMMUNICATIONS,12(1).
MLA	Wu, Shuzhuang,et al."Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years".NATURE COMMUNICATIONS 12.1(2021).