Exploration of a simple model for ice ages

Fowler, A. C. and Rickaby, R. E. M. and Wolff, E. W. (2012) Exploration of a simple model for ice ages. International Journal on Geomathematics. ISSN 1869-2672 eissn : 1869-2680 DOI 10.1007/s13137-012-0040-7

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Abstract

We argue that, while Milanković variations in solar radiation undoubtedly have a major influence on the timing of the Quaternary ice ages, they are partly incidental to their underlying causes. Based on observations of the significance of CO2, we propose a conceptually simple (but complicated in detail) energy balance type model which has the ability to explain the underlying oscillatory nature of ice ages. We are led to develop a model which combines ice sheet growth and atmospheric energy balance with ocean carbon balance. In order to provide results which mimic the basic features of the observations, we develop novel hypotheses as follows. The succession of the most recent ice ages can be explained as being due to an oscillation due to the interaction of the growing northern hemisphere ice sheets and proglacial lakes which form as they migrate south. The CO2 signal which faithfully follows the proxy temperature signal can then be explained as being due to a combination of thermally activated ocean biomass production, which enables the rapid CO2 rise at glacial terminations, and enhanced glacial carbonate weathering through the exposure of continental shelves, which enables CO2 to passively follow the subsequent glacial cooling cycle. Milanković variations provide for modulations of the amplitude and periods of the resulting signals.

Item Type: Article
Uncontrolled Keywords: NIL AREP
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: International Journal on Geomathematics
Identification Number: 10.1007/s13137-012-0040-7
Depositing User: Sarah Humbert
Date Deposited: 31 Aug 2013 14:26
Last Modified: 31 Aug 2013 14:26
URI: http://eprints.esc.cam.ac.uk/id/eprint/2845

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