Early last glacial intra-interstadial climate variability recorded in a Sardinian speleothem

• Main Authors: Columbu, Andrea, Drysdale, Russell, Capron, Emilie, Woodhead, Jon, de Waele, Jo, Sanna, Laura, Hellstrom, Jo, Bajo, Petra
• Other Authors: Université de Bologne, University of Melbourne, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), School of Earth Sciences Melbourne, Faculty of Science Melbourne, University of Melbourne-University of Melbourne, Istituto Italiano di Speleologia, Department of Resource Management and Geography
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: Speleothems; Greenland interstadials/stadials; Ice-core chronology; U-Th dating; [SDE.MCG]Environmental Sciences/Global Changes; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; [SDE.IE]Environmental Sciences/Environmental Engineering; [SDE.ES]Environmental Sciences/Environmental and Society; [SHS.GEO]Humanities and Social Sciences/Geography; Greenland; ice core; NGRIP
• Online Access: https://hal.science/hal-02009162

International audience Chemical and physical proxy data from a precisely dated early last glacial (similar to 113-110 ka, MIS5d) Sardinian stalagmite reveal a sub-millennial-scale, cool-dry climate event centered at 112.0 (+0.52)/(-0.59) ka, followed by a rapid return to warm-wet conditions at 111.76 (+0-43)/(-0.45) ka. Comparison with regional speleothem records and the palaeotemperature proxy record from the NGRIP ice core (Greenland) suggests that this event corresponds to Greenland Interstadial (GI) 25b and 25a, an intra-interstadial climate oscillation within GI-25, according to the recent Greenland stratigraphic framework. The speleothem age is in reasonable agreement (within 0.8 kyr) with that of the corresponding event in Greenland based on the GICC05modelext ice chronology but is older by about 3.7 kyr than the Greenland age based on the AICC2012 chronology. (C) 2017 Elsevier Ltd. All rights reserved.