Clim. Past Discuss., 8, 3143-3157, 2012
www.clim-past-discuss.net/8/3143/2012/
doi:10.5194/cpd-8-3143-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Climate of the Past (CP). Please refer to the corresponding final paper in CP.
Terminations VI and VIII (∼ 530 and ∼ 720 kyr BP) tell us the importance of obliquity and precession in the triggering of deglaciations
F. Parrenin1 and D. Paillard2
1Laboratoire de glaciologie et géophysique de l'environnement (LGGE), UMR5183, CNRS/UJF, Grenoble, France
2Laboratoire des Sciences du Climat et de l'Environnement, CEA/CNRS/UVSQ, Gif-sur-Yvette, France

Abstract. The main variations of ice volume of the last million years can be explained from orbital parameters (Laskar et al., 2004) by assuming climate oscillates between two states: glaciations and deglaciations (Parrenin and Paillard, 2003; Imbrie et al., 2011) (or terminations). An additional combination of ice volume and orbital parameters seems to form the trigger of a deglaciation (Parrenin and Paillard, 2003), while only orbital parameters seem to play a role in the triggering of glaciations (Khodri et al., 2001). Here we present a conceptual model which realistically reproduce ice volume variations during the past million years and in particular the timing of the 11 canonical terminations. Exploring our model's parameters exhaustively, we show that obliquity plays a fundamental role in the triggering of termination VI (~ 530 kyr BP), while precession plays a fundamental role in the triggering of termination VIII (~ 720 kyr ago).

Citation: Parrenin, F. and Paillard, D.: Terminations VI and VIII (∼ 530 and ∼ 720 kyr BP) tell us the importance of obliquity and precession in the triggering of deglaciations, Clim. Past Discuss., 8, 3143-3157, doi:10.5194/cpd-8-3143-2012, 2012.
 
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