NDLI: Dynamics of ~100-kyr glacial cycles during the early Miocene

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Dynamics of ~100-kyr glacial cycles during the early Miocene

Content Provider	Semantic Scholar
Author	Liebrand, Diederik Lourens, Lucas Joost Boer, Bas De Wal, Roderick S. W. Van De
Copyright Year	2010
Abstract	Here, we present high-resolution stable isotope records from ODP Site 1264 in the South-Eastern Atlantic Ocean, which resolve the latest Oligocene to early Miocene (23.7–18.9 Ma) climate changes. Using an inverse modelling technique, we decom- posed the oxygen isotope record into temperature and ice volume and found that the Antarctic ice sheet expanded during distinct episodes (e.g., Mi zones) of low short-term (∼100-kyr) eccentricity forcing, which occur two to four long-term (400-kyr) eccentricity cycles apart. We argue that a non-linear mechanism, such as the merging of (several) large East Antarctic ice sheets, caused the build-up of a larger ice sheet. During the termination phases of these larger ice sheets, on the contrary, we find a more linear response of ice-sheet variability to orbital forcing and climate became highly sensitive to the ∼100-kyr eccentricity cycle. At the Oligocene-Miocene transition the model output indicates a decrease in Northern Hemisphere temperatures such that a small ice cap could develop on Greenland. This supports the hypothesis of a threshold response for the development of Northern Hemisphere land ice to decreasing pCO2.
Starting Page	2741
Ending Page	2766
Page Count	26
File Format	PDF HTM / HTML
DOI	10.5194/cpd-6-2741-2010
Volume Number	6
Alternate Webpage(s)	https://www.clim-past-discuss.net/6/2741/2010/cpd-6-2741-2010-supplement.pdf
Alternate Webpage(s)	https://www.clim-past-discuss.net/6/C1641/2011/cpd-6-C1641-2011.pdf
Alternate Webpage(s)	http://www.gtsnext.eu/publications/abstracts/201104Liebrand.PDF
Alternate Webpage(s)	https://www.clim-past-discuss.net/6/C1646/2011/cpd-6-C1646-2011.pdf
Alternate Webpage(s)	https://www.clim-past-discuss.net/6/C1463/2011/cpd-6-C1463-2011.pdf
Alternate Webpage(s)	https://www.clim-past-discuss.net/6/C1636/2011/cpd-6-C1636-2011.pdf
Alternate Webpage(s)	https://doi.org/10.5194/cpd-6-2741-2010
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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