Title A phase-space model for Pleistocene ice volume
Author Imbrie, J.Z.; Imbrie-Moore, A.; Lisiecki, L.E.
Author Affil Imbrie, J.Z., University of Virginia, Department of Mathematics, Charlottesville, VA. Other: Saint Andrew's School; University of California, Santa Barbara
Source Earth and Planetary Science Letters, 307(1-2), p.94-102, . Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012- 821X
Publication Date July 1, 2011
Notes In English. Supplementary data available in online version. 35 refs. GeoRef Acc. No: 309683
Index Terms climate; glaciation; ice; models; Pleistocene; volume; Cenozoic; climate forcing; cycles; cyclic processes; eccentricity; equations; obliquity of the ecliptic; orbital forcing; phase space; Quaternary
Abstract We present a phase-space model that simulates Pleistocene ice volume changes based on Earth's orbital parameters. Terminations in the model are triggered by a combination of ice volume and orbital forcing and agree well with age estimates for Late Pleistocene terminations. The average phase at which model terminations begin is approximately 9090 before the maxima in all three orbital cycles. The large variability in phase is likely caused by interactions between the three cycles and ice volume. Unlike previous ice volume models, this model produces an orbitally driven increase in 100- kyr power during the mid-Pleistocene transition without any change in model parameters. This supports the hypothesis that Pleistocene variations in the 100-kyr power of glacial cycles could be caused, at least in part, by changes in Earth's orbital parameters, such as amplitude modulation of the 100-kyr eccentricity cycle, rather than changes within the climate system.
URL http://hdl.handle.net/10.1016/j.epsl.2011.04.018
Publication Type journal article
Record ID 65006415