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The Mid-Brunhes Event and West Antarctic ice sheet stability

Holden, P. B.; Edwards, N. R.; Wolff, E. W.; Valdes, P. J. and Singarayer, J. S. (2011). The Mid-Brunhes Event and West Antarctic ice sheet stability. Journal of Quaternary Science, 26(5) pp. 474–477.

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The complex cyclical nature of Pleistocene climate, driven by the evolving orbital configuration of the Earth, is well known but not well understood. A major climatic transition took place at the Mid-Brunhes Event (MBE), ~430 ka BP after which the amplitude of the ~100 ka climate oscillations increased, with substantially warmer interglacials, including periods warmer than the present. Recent modelling has indicated that whilst the timing of these Warmer-than-Present-Transient (WPT) events is consistent with southern warming due to a deglaciation-forced slowdown of Atlantic Meridional Overturning Circulation, the magnitude of warming requires a local amplification, for which a candidate is the feedback of significant West Antarctic Ice Sheet (WAIS) retreat. We here extend this argument, based on the absence of WPTs in the early ice-core record (450 to 800 ka BP), to hypothesise that the MBE could be a manifestation of decreased WAIS stability, triggered by ongoing subglacial erosion.

Item Type: Journal Article
Copyright Holders: 2011 John Wiley & Sons, Ltd
ISSN: 1099-1417
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetNERC (Natural Environment Research Council)
Extra Information: The definitive version is available at
Keywords: Mid-Brunhes Event; West Antarctic ice sheet; interglacials; glacial cycles; GENIE
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 28967
Depositing User: Philip Holden
Date Deposited: 21 Jun 2011 13:42
Last Modified: 25 Mar 2014 18:27
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