气候变化领域集成服务门户(CCPortal): Southern Ocean link between changes in atmospheric CO2 levels and northern-hemisphere climate anomalies during the last two glacial periods

CCPortal

DOI	10.1016/j.quascirev.2019.106067
	Southern Ocean link between changes in atmospheric CO2 levels and northern-hemisphere climate anomalies during the last two glacial periods
	Gottschalk J.; Skinner L.C.; Jaccard S.L.; Menviel L.; Nehrbass-Ahles C.; Waelbroeck C.
发表日期	2020
ISSN	0277-3791
卷号	230
英文摘要	Past millennial-scale changes in atmospheric CO2 (CO2,atm) concentrations have often been attributed to variations in the overturning timescale of the ocean that result in changes in the marine carbon inventory. Yet, there remains a paucity of proxy evidence that documents changes in marine carbon storage globally, and that links them to abrupt climate variability in the northern hemisphere associated with perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The last two glacial periods were suggested to differ in the spatial extent of the AMOC and its sensitivity to perturbations. This provides an opportunity to compare the nature of marine carbon cycle-climate feedbacks between them. Here, we reconstruct variations in respired carbon storage (via oxygenation) and the AMOC “geometry” (via carbonate ion saturation) in the deep South Atlantic. We infer decreases in deep South Atlantic respired carbon levels at times of weakened AMOC and rising CO2,atm concentrations during both glacial periods. These findings suggest a consistent pattern of increased Southern Ocean convection and/or air-sea CO2 fluxes during northern-hemisphere stadials accompanying AMOC perturbations and promoting a rise in CO2,atm levels. We find that net ocean carbon loss, and hence the magnitude of CO2,atm rise, is largely determined by the stadial duration. North Atlantic climate anomalies therefore affect Southern Ocean carbon cycling in a consistent manner, through oceanic (e.g., ventilation seesaw) and/or atmospheric processes (e.g., Ekman pumping). © 2019 Elsevier Ltd
英文关键词	Atmospheric CO2 variations; Carbon cycle; Dansgaard-Oeschger cycles; Foraminifera; Glacials; Interstadials; Palaeoclimatology; Redox-sensitive elements; Southern Ocean; Stadials
语种	英语
scopus关键词	Carbon dioxide; Climate change; Glacial geology; Carbon cycles; Dansgaard-Oeschger cycles; Foraminifera; Glacials; Interstadials; Palaeoclimatology; Redox sensitives; Southern ocean; Stadials; Oceanography; carbon dioxide enrichment; carbon storage; climate variation; glacial environment; meridional circulation; Northern Hemisphere; oceanic convection; paleoceanography; paleoclimate; redox conditions; temperature anomaly; Atlantic Ocean; Atlantic Ocean (North); Atlantic Ocean (South); Southern Ocean; 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/151603
作者单位	Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Climate Change Research Centre, PANGEA, University of New South Wales, Sydney, New South Wales, Australia; Climate and Environmental Physics, Physics Institute, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CNRS-CEA-UVSQ, Université de Paris-Saclay, Gif-sur-Yvette, France
推荐引用方式 GB/T 7714	Gottschalk J.,Skinner L.C.,Jaccard S.L.,et al. Southern Ocean link between changes in atmospheric CO2 levels and northern-hemisphere climate anomalies during the last two glacial periods[J],2020,230.
APA	Gottschalk J.,Skinner L.C.,Jaccard S.L.,Menviel L.,Nehrbass-Ahles C.,&Waelbroeck C..(2020).Southern Ocean link between changes in atmospheric CO2 levels and northern-hemisphere climate anomalies during the last two glacial periods.Quaternary Science Reviews,230.
MLA	Gottschalk J.,et al."Southern Ocean link between changes in atmospheric CO2 levels and northern-hemisphere climate anomalies during the last two glacial periods".Quaternary Science Reviews 230(2020).