No glacial-interglacial cycle in the ice volume simulated under a constant astronomical forcing and a variable CO2

• Published in: Geophysical Research Letters
• Main Authors: Loutre, Marie-France, Berger, André
• Other Authors: UCL - SC/PHYS - Département de physique
• Format: Article in Journal/Newspaper
• Language: English
• Published: Amer Geophysical Union 2000
• Subjects: ice core
• Online Access: http://hdl.handle.net/2078.1/43665; https://doi.org/10.1029/1999GL006081

The relative impact of the CO2 concentration on climate-over the last 200 kyr is investigated here using the Louvain-la-Neuve 2-dimension Northern Hemisphere (LLN 2-D NH) climate model forced by different constant insolations and the variable CO2 concentration reconstructed from the Vostok ice-core record. Under such conditions the 100-kyr cycle in-the Northern Hemisphere ice volume cannot be reproduced. Either a warm orbit prevents the ice sheets from forming-or a present-day and colder orbits do not allow them tol:melt:after being formed. The global hemispheric temperature,, however, continues to respond directly to the atmospheric CO2-concentration changes.