Evidence for Obliquity Forcing of Glacial Termination II

Author:

Drysdale R. N.1,Hellstrom J. C.2,Zanchetta G.345,Fallick A. E.6,Sánchez Goñi M. F.7,Couchoud I.1,McDonald J.1,Maas R.2,Lohmann G.8,Isola I.4

Affiliation:

1. Environmental and Climate Change Group, University of Newcastle, Callaghan, New South Wales 2308, Australia.

2. School of Earth Sciences, University of Melbourne, Parkville, Victoria 2010, Australia.

3. Department of Earth Sciences, University of Pisa, Pisa 56100, Italy.

4. Istituto Nazionale di Geofisica e Vulcanologia, via della Fagiola, Pisa 56126, Italy.

5. IGG-CNR, Via Moruzzi, 1 56100 Pisa, Italy.

6. Scottish Universities Environmental Research Centre, East Kilbride G75 0GF, UK.

7. EPHE, UMR CNRS 5805 EPOC, Université Bordeaux 1, 33405 Talence, France.

8. Alfred Wegener Institute for Polar and Marine Research, Bussestrasse 24, D-27570 Bremerhaven, Germany.

Abstract

Oblique Reasoning In Milankovich theory, the canonical theory of glaciation and deglaciation, ice sheets wax and wane in response to the amount of summer insolation at a latitude of 65°N, which is consistent with the observed timing of the last deglaciation. The penultimate glaciation behaved quite differently, however. Now, Drysdale et al. (p. 1527 , published online 13 August) offer firmer constraints on the timing of the penultimate deglaciation, by correlating a difficult-to-date marine record of ocean volume to a precisely datable nearby speleothem (terrestrial stalagmite). Ocean volume began to increase about 141,000 years ago, thousands of years before the rise in 65°N summer insolation. Thus, instead of the forcing mechanism proposed by Milankovich, variations in Earth's obliquity may be mostly responsible for the disappearance of ice sheets.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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