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

• Main Authors: Boer, B. de, Lourens, L.J., Wal, R.S.W. van de
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2014
• Subjects: Natuur- en sterrenkunde; Aardwetenschappen; Antarctic; Antarc*; Antarctica; Ice Sheet
• Online Access: https://dspace.library.uu.nl/handle/1874/292218

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 threedimensional ice-sheet models. Our simulation shows that the 400,000-year long eccentricity cycles of Antarctica vary coherently with d13C 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.