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Sanchez-Goni, M. F.
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Sanchez-Goni, M. F.
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- PublicationRestrictedEvidence for Obliquity Forcing of Glacial Termination II(2009-09-18)
; ; ; ; ; ; ; ; ; ; ;Drysdale, R. N.; Environmental and Climate Change Group, University of Newcastle, Callaghan, New South Wales 2308, Australia ;Hellstrom, J. C.; School of Earth Sciences, University of Melbourne, Parkville, Victoria 2010, Australia ;Zanchetta, G.; Department of Earth Sciences, University of Pisa, Pisa 56100, Italy; Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa, Pisa, Italy; IGG-CNR, Pisa, Italy ;Fallick, A. E.; Scottish Universities Environmental Research Centre, East Kilbride G75 0GF, UK. ;Sanchez-Goni, M. F.; EPHE, UMR CNRS 5805 EPOC, Université Bordeaux 1, 33405 Talence, France. ;Couchoud, I.; Environmental and Climate Change Group, University of Newcastle, Callaghan, New South Wales 2308, Australia ;McDonald, J.; Environmental and Climate Change Group, University of Newcastle, Callaghan, New South Wales 2308, Australia ;Maas, R.; School of Earth Sciences, University of Melbourne, Parkville, Victoria 2010, Australia ;Lohmann, G.; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany. ;Isola, I.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia; ; ; ; ; ; ; ; ; Variations in the intensity of high-latitude Northern Hemisphere summer insolation, driven largely by precession of the equinoxes, are widely thought to control the timing of Late Pleistocene glacial terminations. However, recently it has been suggested that changes in Earth’s obliquity may be a more important mechanism. We present a new speleothem-based North Atlantic marine chronology that shows that the penultimate glacial termination (Termination II) commenced 141,000 ± 2500 years before the present, too early to be explained by Northern Hemisphere summer insolation but consistent with changes in Earth’s obliquity. Our record reveals that Terminations I and II are separated by three obliquity cycles and that they started at near-identical obliquity phases.183 19