Four climate cycles of recurring deep and surface water destabilizations on the Iberian margin

• Published in: Science
• Main Authors: Martrat, Belen, Grimalt, Joan O., Shackleton, Nicholas J., Abreu, Lucía de, Hutterli, Manuel A., Stocker, Thomas F.
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Association for the Advancement of Science 2007
• Subjects: Cenntenial climate viariability; Bipolar behavior; Climate cycles; Surface water destabilizations; Greenland; Villanueva; Antarc*; Antarctica; EPICA; Greenland ice core; Greenland Ice core Project; ice core; North Greenland; North Greenland Ice Core Project
• Online Access: http://hdl.handle.net/10261/11387; https://doi.org/10.1126/science.1139994

6 pages, 3 figures, 1 table.-- PMID: 17569824 [PubMed].-- Printed version published on Jul 27, 2007. Centennial climate variability over the last ice age exhibits clear bipolar behavior. High-resolution analyses of marine sediment cores from the Iberian margin trace a number of associated changes simultaneously. Proxies of sea surface temperature and water mass distribution, as well as relative biomarker content, demonstrate that this typical north-south coupling was pervasive for the cold phases of climate during the past 420,000 years. Cold episodes after relatively warm and largely ice-free periods occurred when the predominance of deep water formation changed from northern to southern sources. These results reinforce the connection between rapid climate changes at Mediterranean latitudes and century-to-millennial variability in northern and southern polar regions. We thank P. C. Tzedakis for pollen data from Tenaghi Philippon and MD01-2443; J. Schwander for providing the Monte-Carlo wiggle-matching program; J. F. McManus for data of core ODP-980; G. C. Bond for data of core DSDP-609; E. Bard and I. Cacho for biomarker data of cores MD95-2042 and MD95-2043, respectively; North Greenland Ice Core Project members and European Project for Ice Coring in Antarctica (EPICA) community members for data of ice cores; D. Amblas for Fig. 1.; B. H. Oldham for editing the text; I. N. McCave for locating the coring sites; M. A. Hall, B. Luengo, and R. Mas for laboratory assistance; and L. C. Skinner, J. Villanueva, and W. H. Berger for providing useful comments. B.M. thanks the grant I3P-BPG2005 from the Itinerario Integrado de Inserción profesional program of the Spanish National Research Council (CSIC), and L.A. thanks the Portuguese Foundation for Science and Technology (SFRH/BPD/1588/2000). We thank the British ocean sediment core repository (BOSCOR); the International Marine Global Change Studies program (IMAGES), and the Bremen core repository [Ocean Drilling program (ODP)] for supplying sediment samples. This ...