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Authors: Drysdale, R. N.* 
Hellstrom, J. C.* 
Zanchetta, G.* 
Fallick, A. E.* 
Sanchez-Goni, M. F.* 
Couchoud, I.* 
McDonald, J.* 
Maas, R.* 
Lohmann, G.* 
Isola, I.* 
Title: Evidence for Obliquity Forcing of Glacial Termination II
Issue Date: 18-Sep-2009
Series/Report no.: 5947/325(2009)
DOI: 10.1126/science.1170371
Keywords: Glacial termination
Subject Classification01. Atmosphere::01.01. Atmosphere::01.01.02. Climate 
01. Atmosphere::01.01. Atmosphere::01.01.04. Processes and Dynamics 
03. Hydrosphere::03.01. General::03.01.03. Global climate models 
Abstract: 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.
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