Preprints
https://doi.org/10.5194/cp-2021-119
https://doi.org/10.5194/cp-2021-119

  13 Sep 2021

13 Sep 2021

Review status: this preprint is currently under review for the journal CP.

Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model

Gaëlle Leloup1,2 and Didier Paillard2 Gaëlle Leloup and Didier Paillard
  • 1Agence Nationale pour la gestion des déchets radioactifs (ANDRA), 1 Rue Jean Monnet, 92290 Châtenay-Malabry, France
  • 2Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ-Université Paris-Saclay, 91198 Gif-sur-Yvette, France

Abstract. Over the Quaternary, the ice volume variations are “paced” by the astronomy. However, the precise way in which the astronomical parameters influence the glacial-interglacial cycles is not clear. The origin of the 100 kyr cycles over the last million year and of the switch from 40 kyr to 100 kyr cycles over the Mid Pleistocene Transition remain largely unexplained. By representing the climate system as oscillating between two states, glaciation and deglaciation, switching once a glaciation and a deglaciation thresholds are crossed, the main features of the ice volume record can be reproduced (Parrenin and Paillard, 2012). However, previous studies have only focused on the use of a single summer insolation as input. Here, we use a simple conceptual model to test and discuss the influence of the use of different summer insolation forcings, having different contributions from precession and obliquity, on the model results. We show that some features are robust. Specifically, to be able to reproduce the frequency shift over the Mid Pleistocene Transition, the deglaciation threshold needs to increase over time, independently of the summer insolation used as input. The quality of the model data agreement however depends on the chosen type of summer insolation and time period considered.

Gaëlle Leloup and Didier Paillard

Status: open (until 08 Nov 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Gaëlle Leloup and Didier Paillard

Data sets

Code and data for results and figures in Climate of the Past "Influence of the choice of insolation forcing on the results of a conceptual glacial cycle model" Gaelle Leloup https://doi.org/10.5281/zenodo.5458785

Gaëlle Leloup and Didier Paillard

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Short summary
Over the last 2.6 Myr, the Quaternary period has been marked by the alternance of extended and reduced Northern Hemisphere ice sheets, known as the glacial-interglacial cycles. With a simple model, we are able to reproduce the main features of the ice volume evolution, like the switch of periodicity – from 41 kyr cycles to 100 kyr cycles – that is observed in the data after 1 Ma BP. The quality of the model-data agreement depending on the input insolation and period considered are discussed.