气候变化领域集成服务门户(CCPortal): Modelling the impact of biogenic particle flux intensity and composition on sedimentary Pa/Th

CCPortal

DOI	10.1016/j.quascirev.2020.106394
	Modelling the impact of biogenic particle flux intensity and composition on sedimentary Pa/Th
	Missiaen L.; Menviel L.C.; Meissner K.J.; Roche D.M.; Dutay J.-C.; Bouttes N.; Lhardy F.; Quiquet A.; Pichat S.; Waelbroeck C.
发表日期	2020
ISSN	0277-3791
卷号	240
英文摘要	There is compelling evidence that millennial climate variability of the last glacial period was associated with significant changes in the Atlantic Meridional Overturning Circulation (AMOC). Several North Atlantic sedimentary Pa/Th records indicate a consistent and large Pa/Th increase across millennial-scale events, which has been interpreted as considerable reduction in North Atlantic Deep Water (NADW) formation. However, the use of sedimentary Pa/Th as a pure kinematic circulation proxy is challenging because Pa and Th are also highly sensitive to changes in particulate flux intensity and composition that might have occurred across these millennial scale events. In this study, we use the Pa/Th enabled iLOVECLIM Earth System Model of intermediate complexity to evaluate the impact of changes in biogenic particle flux intensity and composition on the Atlantic Pa/Th. We find that in our model, changes in Particulate Organic Carbon (POC), and to a lesser extent biogenic opal production, can significantly affect the sedimentary Pa/Th, possibly explaining up to 30% of the observed North Atlantic Pa/Th increase across Heinrich stadial 1. The sedimentary Pa/Th response is also likely sensitive to shifts in the geographical distribution of the particles, especially in high scavenging regions. Our study suggests that a decrease in opal production in the northwest Atlantic can induce a far field Pa/Th increase in a large part of the North Atlantic basin. Therefore, local monitoring of particle fluxes may not be sufficient to rule out any influence of changing particle fluxes on sedimentary Pa/Th records. © 2020 Elsevier Ltd
英文关键词	Abrupt climate events; Ocean circulation; Pa/Th; Particle fluxes
语种	英语
scopus关键词	Geographical distribution; Geographical regions; Organic carbon; Sedimentology; Atlantic meridional overturning circulations; Earth system model of intermediate complexity; Last glacial period; Millennial climate variabilities; North atlantic deep water formations; Northwest Atlantic; Particulate fluxes; Particulate organic carbon; Oceanography; biogenic material; complexity; geographical distribution; Heinrich event; North Atlantic Deep Water; particulate flux; particulate organic matter; protactinium; thorium
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/151425
作者单位	Climate Change Research Centre, University of New South Wales, Sydney, Australia; ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, Australia; Laboratoire des Sciences du Climat et de l'environnement, LSCE/IPSL, CEA-CNRS-UVSQ-Université Paris Saclay, Gif sur Yvette, F91-198, France; Vrije Universiteit Amsterdam, Faculty of Science, Cluster Earth and Climate, de Boelelaan 1085, Amsterdam, HV 1081, Netherlands; Institut Louis Bachelier, Chair Energy and Prosperity, Paris, 75002, France; Univ Lyon, ENSL, Univ Lyon 1, CNRS, LGL-TPE, Lyon, F-69007, France; Max Planck Inst Chem, Climate Geochem Dept, Hahn Meitner Weg 1, Mainz, D-55128, Germany; LOCEAN/IPSL, Sorbonne Université-CNRS-IRD-MNHN, Paris, UMR7159, France
推荐引用方式 GB/T 7714	Missiaen L.,Menviel L.C.,Meissner K.J.,et al. Modelling the impact of biogenic particle flux intensity and composition on sedimentary Pa/Th[J],2020,240.
APA	Missiaen L..,Menviel L.C..,Meissner K.J..,Roche D.M..,Dutay J.-C..,...&Waelbroeck C..(2020).Modelling the impact of biogenic particle flux intensity and composition on sedimentary Pa/Th.Quaternary Science Reviews,240.
MLA	Missiaen L.,et al."Modelling the impact of biogenic particle flux intensity and composition on sedimentary Pa/Th".Quaternary Science Reviews 240(2020).