Abstract
Abstract Post-Eemian glacial inception [the transition between marine oxygen isotopic stage (MOIS) 5e and MOIS 5d] began approximately 117 000 years before present (117 kyr BP) and led to significant Northern Hemisphere glaciation within the ensuing 5000 yr. Previous sensitivity studies with atmospheric general circulation models (AGCMs) have had difficulty producing glacial nucleation in high northern latitude regions of the globe. A base simulation of this process has been conducted using the Canadian Centre for Climate Modelling and Analysis (CCCma) GCMII with mixed layer slab ocean model constrained so as to ensure that the model reproduces the set of Atmospheric Model Intercomparison Project 2 (AMIP2) modern sea surface temperatures (SSTs) under conditions of modern radiative forcing. This simulation demonstrates that entry into glacial conditions at 116 kyr BP requires only the introduction of post-Eemian orbital insolation and standard preindustrial CO2 concentrations. Two additional sensitivity ex...
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