Interglacials of the last 800,000 years

Berger, A. and Crucifix, M. and Hodell, D. A. and Mangili, C and McManus, J. F. and Otto-Bliesner, B. and Pol, K. and Raynaud, D. and Skinner, L. C. and Tzedakis, P. C. and Wolff, E. W. and Yin, Q. Z. and Abe-Ouchi, A. and Barbante, C. and Brovkin, V. and Cacho, I. and Capron, E. and Ferretti, P. and Ganopolski, A. and Grimalt, J. O. and Hönisch, B. and Kawamura, K. (2016) Interglacials of the last 800,000 years. Reviews of Geophysics, 54 (1). pp. 162-219. ISSN 8755-1209 DOI 10.1002/2015RG000482

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Official URL: http://doi.org/10.1002/2015RG000482

Abstract

Interglacials, including the present (Holocene) period, are warm, low land ice extent (high sea level), end-members of glacial cycles. Based on a sea level definition, we identify eleven interglacials in the last 800,000 years, a result that is robust to alternative definitions. Data compilations suggest that despite spatial heterogeneity, Marine Isotope Stages (MIS) 5e (last interglacial) and 11c (~400 ka ago) were globally strong (warm), while MIS 13a (~500 ka ago) was cool at many locations. A step change in strength of interglacials at 450 ka is apparent only in atmospheric CO2 and in Antarctic and deep ocean temperature. The onset of an interglacial (glacial termination) seems to require a reducing precession parameter (increasing Northern Hemisphere summer insolation), but this condition alone is insufficient. Terminations involve rapid, nonlinear, reactions of ice volume, CO2, and temperature to external astronomical forcing. The precise timing of events may be modulated by millennial-scale climate change that can lead to a contrasting timing of maximum interglacial intensity in each hemisphere. A variety of temporal trends is observed, such that maxima in the main records are observed either early or late in different interglacials. The end of an interglacial (glacial inception) is a slower process involving a global sequence of changes. Interglacials have been typically 10–30 ka long. The combination of minimal reduction in northern summer insolation over the next few orbital cycles, owing to low eccentricity, and high atmospheric greenhouse gas concentrations implies that the next glacial inception is many tens of millennia in the future.

Item Type: Article
Uncontrolled Keywords: 2016AREP; IA70
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Reviews of Geophysics
Volume: 54
Page Range: pp. 162-219
Identification Number: 10.1002/2015RG000482
Depositing User: Sarah Humbert
Date Deposited: 20 Apr 2017 21:38
Last Modified: 20 Apr 2017 21:38
URI: http://eprints.esc.cam.ac.uk/id/eprint/3937

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