Persistent 400,000-year variability of Antarctic ice volume and the carbon cycle is revealed throughout the Plio-Pleistocene

B. de Boer (), Lucas J. Lourens and Roderik S.W. van de Wal
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B. de Boer: Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University
Lucas J. Lourens: Faculty of Geosciences, Utrecht University
Roderik S.W. van de Wal: Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Marine sediment records from the Oligocene and Miocene reveal clear 400,000-year climate cycles related to variations in orbital eccentricity. These cycles are also observed in the Plio-Pleistocene records of the global carbon cycle. However, they are absent from the Late Pleistocene ice-age record over the past 1.5 million years. Here we present a simulation of global ice volume over the past 5 million years with a coupled system of four three-dimensional ice-sheet models. Our simulation shows that the 400,000-year long eccentricity cycles of Antarctica vary coherently with δ13C data during the Pleistocene, suggesting that they drove the long-term carbon cycle changes throughout the past 35 million years. The 400,000-year response of Antarctica was eventually suppressed by the dominant 100,000-year glacial cycles of the large ice sheets in the Northern Hemisphere.

Date: 2014
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DOI: 10.1038/ncomms3999

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