气候变化领域集成服务门户(CCPortal): Carbon isotopes and PaĝTh response to forced circulation changes: a model perspective

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DOI	10.5194/cp-16-867-2020
	Carbon isotopes and PaĝTh response to forced circulation changes: a model perspective
	Missiaen L.; Bouttes N.; Roche D.M.; Dutay J.-C.; Quiquet A.; Waelbroeck C.; Pichat S.; Peterschmitt J.-Y.
发表日期	2020
ISSN	18149324
起始页码	867
结束页码	883
卷号	16 期号:3
英文摘要	Understanding the ocean circulation changes associated with abrupt climate events is key to better assessing climate variability and understanding its different natural modes. Sedimentary Pa=Th, benthic δ13C and Δ114C are common proxies used to reconstruct past circulation flow rate and ventilation. To overcome the limitations of each proxy taken separately, a better approach is to produce multiproxy measurements on a single sediment core. Yet, different proxies can provide conflicting information about past ocean circulation. Thus, modelling them in a consistent physical framework has become necessary to assess the geographical pattern and the timing and sequence of the multiproxy response to abrupt circulation changes. We have implemented a representation of the 231Pa and 230Th tracers into the model of intermediate complexity iLOVECLIM, which already included δ13C and Δ114C. We have further evaluated the response of these three ocean circulation proxies to a classical abrupt circulation reduction obtained by freshwater addition in the Nordic Seas under preindustrial boundary conditions. The proxy response is shown to cluster in modes that resemble the modern Atlantic water masses. The clearest and most coherent response is obtained in the deep (> 2000 m) northwest Atlantic, where δ13C and Δ114C significantly decrease, while Pa=Th increases. This is consistent with observational data across millennial-scale events of the last glacial. Interestingly, while in marine records, except in rare instances, the phase relationship between these proxies remains unclear due to large dating uncertainties, in the model the bottom water carbon isotope (δ13C and Δ114C) response lags behind the sedimentary Pa=Th response by a few hundred years. © Author(s) 2020.
语种	英语
scopus关键词	carbon isotope; climate variation; geochronology; late glacial; oceanic circulation; paleoclimate; protactinium; sedimentary sequence; thorium isotope
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146713
作者单位	Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ-Université Paris-Saclay, Gif-sur-Yvette, 91198, France; Climate Change Research Centre, University of New South Wales, Sydney, Australia; Earth and Climate Cluster, Faculty of Science, Vrije Universiteit Amsterdam, de Boelelaan 1085, Amsterdam, 1081HV, Netherlands; Chair Energy and Prosperity, Institut Louis Bachelier, Paris, 75002, France; Univ Lyon, ENSL, Univ Lyon 1, CNRS, LGL-TPE, Lyon, 69007, France; Climate Geochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
推荐引用方式 GB/T 7714	Missiaen L.,Bouttes N.,Roche D.M.,et al. Carbon isotopes and PaĝTh response to forced circulation changes: a model perspective[J],2020,16(3).
APA	Missiaen L..,Bouttes N..,Roche D.M..,Dutay J.-C..,Quiquet A..,...&Peterschmitt J.-Y..(2020).Carbon isotopes and PaĝTh response to forced circulation changes: a model perspective.Climate of the Past,16(3).
MLA	Missiaen L.,et al."Carbon isotopes and PaĝTh response to forced circulation changes: a model perspective".Climate of the Past 16.3(2020).