Millennial-scale climate variability during the Last Interglacial recorded in a speleothem from south-western France |
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| Authors: | I. Couchoud D. Genty D. Hoffmann R. Drysdale D. Blamart |
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| Affiliation: | 1. Environnement, Dynamique et Territoires de la Montagne, UMR 5204, Université de Savoie, bâtiment Pôle Montagne, 73376 Le Bourget du Lac cedex, France;2. Laboratoire des Sciences, du Climat et de l''Environnement, UMR CEA/CNRS/USVQ 1572, L''Orme des Merisiers CEA Saclay, 91191 Gif sur Yvette cedex, France;3. Bristol Isotope Group, School of Geographical Sciences, University of Bristol, University Road, Bristol BS81SS, United Kingdom;4. Environmental and Climate Change Research Group, Geology Building, University of Newcastle, Callaghan NSW 2308, Australia;1. Laboratoire des Sciences du Climat et de l''Environnement (LSCE/IPSL), Laboratoire CEA/CNRS/UVSQ, Gif-sur-Yvette, France;2. Faculty of Earth and Life Sciences, VU University Amsterdam, The Netherlands;3. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an, China;4. Department of Earth Sciences, University of Minnesota, Minneapolis, MN, USA;1. Potsdam Institute for Climate Impact Research, Telegrafenberg, 14473 Potsdam, Germany;2. GFZ German Research Centre for Geosciences, Section ‘Climate Dynamics and Landscape Development’, Telegrafenberg, 14473 Potsdam, Germany;3. Department of Earth and Environmental Sciences, Katholieke Universiteit Leuven, Leuven, Belgium;4. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK;5. Department of Earth Sciences, Royal Holloway University of London, Egham TW20 0EX, UK;6. Institute of Geology, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria;7. Department of Archaeology and Centre for Past Climate Change, University of Reading, Reading RG6 6UR, UK;8. Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN 37240, USA;9. Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland;1. Department of Earth System Science, University of California, Irvine, 92697, USA;2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, PR China;1. Boston College, Chestnut Hill, MA 02467, USA;2. The University of Texas at Austin, Austin, TX 78712, USA;1. Department of Geology and Geophysics, Yale University, 210 Whitney Avenue, New Haven, CT 06511, USA;2. The Fredy & Nadine Herrmann Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem 91904, Israel;3. Geological Survey of Israel, 30 Malchei Israel Street, Jerusalem 95501, Israel;1. Geological Institute, ETH Zürich, Switzerland;2. Physics Institute, University of Bern, Switzerland;3. Oeschger Centre for Climate Change Research, University of Bern, Switzerland;4. Institute of Geology, University of Innsbruck, Austria;5. Institute of Applied Physics, University of Bern, Switzerland;6. EAWAG, Swiss Federal Institute of Aquatic Science and Technology, Switzerland;7. Institute of Geochemistry and Petrology, ETH Zürich, Switzerland;8. Department of Earth and Atmospheric Sciences, Georgia Institute of Technology, USA;9. Division of Geological and Planetary Sciences, California Institute of Technology, USA;10. Department of Archaeology, Centre for Past Climate Change, School of Archaeology, Geography and Environmental Science, University of Reading, United Kingdom |
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| Abstract: | A stalagmite (BDinf) recovered from an archaeological cave (Bourgeois–Delaunay, La Chaise de Vouthon) in SW France provides a rare, high-resolution, precisely dated continental palaeoclimate record covering the warmest part of the Last Interglacial (128 ± 1–121 ± 1 ka). The growth interval spans the pluvial period recorded in Soreq and Peqiin Cave speleothems (during sapropel event S5), suggesting that the eastern Mediterranean and western Europe experienced relatively wet conditions simultaneously during this part of the Last Interglacial. Stable oxygen and carbon isotope ratios from BDinf show prominent millennial-scale variations, which are interpreted respectively in terms of changes in the amount of rainfall reaching the cave and soil biological activity. The timing of the oxygen isotope changes agrees with similar excursions recorded in speleothems from Corchia Cave (Italy), where close coupling between rainfall amount and regional sea surface temperatures has been demonstrated. Three “warmer–wetter” periods are interspersed with four “cooler–drier” periods. The first “warmer–wetter” period is the most prominent, as is the case at Corchia, and coincides with the SST optimum off western Europe. This is followed by a prominent “cooler–drier” excursion (centred on ～126 ka), which can be linked to a period of increased loess deposition recorded in annually laminated lake sediments from Eifel, Germany. Although there is already ample evidence for Last Interglacial climate instability, we show for the first time that specific climatic events occurred more or less synchronously between southwestern Europe, central Mediterranean (Italy) and northern Europe (Germany). |
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