气候变化领域集成服务门户(CCPortal): Consistent fluctuations in intermediate water temperature off the coast of Greenland and Norway during Dansgaard-Oeschger events

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DOI	10.1016/j.quascirev.2019.105887
	Consistent fluctuations in intermediate water temperature off the coast of Greenland and Norway during Dansgaard-Oeschger events
	Sessford E.G.; Jensen M.F.; Tisserand A.A.; Muschitiello F.; Dokken T.; Nisancioglu K.H.; Jansen E.
发表日期	2019
ISSN	0277-3791
卷号	223
英文摘要	Rapid warmings epitomize the Dansgaard-Oeschger events that are recorded in Greenland ice cores and imprinted in ocean sediment cores. While the abrupt climate changes appear connected to perturbations in sea ice and ocean circulation, it is unclear how the water masses within the Nordic Seas responded and were influenced by the inflowing Atlantic Water in the absence or presence of sea ice. High resolution reconstructions of benthic Mg/Ca, together with stable isotopes of carbon and oxygen (δ13C and δ18O), show a recurring warming (2.5° ± 0.5 °C) occurring consistently at the inflow and outflow of the Nordic Seas at intermediate depths down to 1500 m during Greenland Stadials 9–6. Using idealized numerical simulations with an eddy-resolving ocean model we investigate the impact of an isolating sea ice cover and freshwater lid in the Nordic Seas. With the presence of an extensive sea ice cover, the warm Atlantic Water entering the Nordic Seas in the east, retains its heat as it exits in the west. The depth of the recirculating warm Atlantic Water increases when including an external freshwater source at the surface of the Nordic Seas. These findings support the view that cold stadials are accompanied by pervasive intermediate water warming across the Nordic Seas. Given the current rates of Arctic sea ice loss, these results provide a potential mechanism for water-column destabilization and inception of abrupt climate change. © 2019 The Authors
英文关键词	Climate dynamics; Dansgaard-Oeschger cycles; Micropaleontology, Foraminifers; Nordic Seas; North Atlantic; Paleoceanography; Quaternary; Stable isotopes
语种	英语
scopus关键词	Isotopes; Mooring; Oceanography; Sea ice; Water; Climate dynamics; Dansgaard-Oeschger cycles; Foraminifers; Nordic seas; North Atlantic; Paleoceanography; Quaternary; Stable isotopes; Climate change; climate variation; Dansgaard-Oeschger cycle; foraminifera; GRIP; ice cover; intermediate water; micropaleontology; oceanic circulation; paleoceanography; Quaternary; reconstruction; sea ice; sea surface temperature; stable isotope; Arctic; Arctic Ocean; Atlantic Ocean; Atlantic Ocean (North); Greenland; Norway; Norwegian Sea; Foraminifera
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151729
作者单位	Department of Earth Science, University of Bergen, Bjerknes Centre for Climate Research, Allégaten 41, Bergen, 5007, Norway; NORCE Norwegian Research Centre AS, Bjerknes Centre for Climate Research, Jahnebakken 5, Bergen, 5007, Norway; University of Cambridge, Department of Geography, Downing Place, Cambridge, CB2 3EN, United Kingdom; Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway
推荐引用方式 GB/T 7714	Sessford E.G.,Jensen M.F.,Tisserand A.A.,et al. Consistent fluctuations in intermediate water temperature off the coast of Greenland and Norway during Dansgaard-Oeschger events[J],2019,223.
APA	Sessford E.G..,Jensen M.F..,Tisserand A.A..,Muschitiello F..,Dokken T..,...&Jansen E..(2019).Consistent fluctuations in intermediate water temperature off the coast of Greenland and Norway during Dansgaard-Oeschger events.Quaternary Science Reviews,223.
MLA	Sessford E.G.,et al."Consistent fluctuations in intermediate water temperature off the coast of Greenland and Norway during Dansgaard-Oeschger events".Quaternary Science Reviews 223(2019).