气候变化领域集成服务门户(CCPortal): Middle Holocene expansion of Pacific Deep Water into the Southern Ocean

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DOI	10.1073/pnas.1908138117
	Middle Holocene expansion of Pacific Deep Water into the Southern Ocean
	Struve T.; Wilson D.J.; van de Flierdt T.; Pratt N.; Crocket K.C.
发表日期	2020
ISSN	0027-8424
起始页码	889
结束页码	894
卷号	117 期号:2
英文摘要	The Southern Ocean is a key region for the overturning and mixing of water masses within the global ocean circulation system. Because Southern Ocean dynamics are influenced by the Southern Hemisphere westerly winds (SWW), changes in the westerly wind forcing could significantly affect the circulation and mixing of water masses in this important location. While changes in SWW forcing during the Holocene (i.e., the last ∼11,700 y) have been documented, evidence of the oceanic response to these changes is equivocal. Here we use the neodymium (Nd) isotopic composition of absolute-dated cold-water coral skeletons to show that there have been distinct changes in the chemistry of the Southern Ocean water column during the Holocene. Our results reveal a pronounced Middle Holocene excursion (peaking ∼7,000–6,000 y before present), at the depth level presently occupied by Upper Circumpolar Deep Water (UCDW), toward Nd isotope values more typical of Pacific waters. We suggest that poleward-reduced SWW forcing during the Middle Holocene led to both reduced Southern Ocean deep mixing and enhanced influx of Pacific Deep Water into UCDW, inducing a water mass structure that was significantly different from today. Poleward SWW intensification during the Late Holocene could then have reinforced deep mixing along and across density surfaces, thus enhancing the release of accumulated CO2 to the atmosphere. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Cold-water corals; Holocene; Neodymium isotopes; Southern Ocean; Water mass mixing
语种	英语
scopus关键词	carbon dioxide; cold water; isotope; neodymium; unclassified drug; water; Article; climate change; controlled study; geographic and geological phenomena; Holocene; Middle Holocene; Pacific Deep Water; priority journal; Southern Hemisphere; Southern Hemisphere westerly wind; Southern Ocean; Upper Circumpolar Deep Water; water and water related phenomena; water mass; wind
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160323
作者单位	Struve, T., Department of Earth Science and Engineering, Imperial College London, London, SW7 2AZ, United Kingdom, Grantham Institute for Climate Change and the Environment, Imperial College London, London, SW7 2AZ, United Kingdom; Wilson, D.J., Department of Earth Science and Engineering, Imperial College London, London, SW7 2AZ, United Kingdom, Institute of Earth and Planetary Sciences, University College London and Birkbeck, University of London, London, WC1E 6BT, United Kingdom; van de Flierdt, T., Department of Earth Science and Engineering, Imperial College London, London, SW7 2AZ, United Kingdom; Pratt, N., Department of Earth Science and Engineering, Imperial College London, London, SW7 2AZ, United Kingdom; Crocket, K.C., School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FE, United Kingdom
推荐引用方式 GB/T 7714	Struve T.,Wilson D.J.,van de Flierdt T.,et al. Middle Holocene expansion of Pacific Deep Water into the Southern Ocean[J],2020,117(2).
APA	Struve T.,Wilson D.J.,van de Flierdt T.,Pratt N.,&Crocket K.C..(2020).Middle Holocene expansion of Pacific Deep Water into the Southern Ocean.Proceedings of the National Academy of Sciences of the United States of America,117(2).
MLA	Struve T.,et al."Middle Holocene expansion of Pacific Deep Water into the Southern Ocean".Proceedings of the National Academy of Sciences of the United States of America 117.2(2020).