Abstract
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 to melt after being formed. The global hemispheric temperature, however, continues to respond directly to the atmospheric CO2‐concentration changes.
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