EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

A comparison of the last two glacial inceptions via fully coupled transient ice and climate modelling.

Marilena Geng and Lev Tarasov
Marilena Geng and Lev Tarasov
  • Memorial University of Newfoundland and Labrador, St. John's, Canada (

Paleo records indicate significant variation in sea level and temperature proxies between different glacial cycles. What is unclear is the extent to which these differences are due to noise in the physical system versus a robust response to external forcings. When one considers what is happening with each individual ice sheet, variations between glacial cycles are largely unknown, given the few relevant records available to constrain ice sheet extent before the Eemian. 

To explore both the controls on past ice sheet and climate evolution and explore bounds on what the evolution might actually have looked like, we are running ensemble simulations of the last two glacial cycles with the fully coupled ice/climate model LCice. LCice is a coupled version of the Loveclim EMIC and GSM glacial systems model with hybrid shallow shelf and shallow ice flow and global visco-elastic glacio-isostatic adjustment. The current configuration includes all 4 ice sheet complexes and is subject to only orbital and greenhouse gas forcing.

To answer the above questions, we present ensemble results for the last two glacial inceptions, focusing on what key ice sheet and climate characteristics are robust across the ensemble and what are not. The role of key forcings and feedbacks are also isolated through a set of sensitivity experiments.  

How to cite: Geng, M. and Tarasov, L.: A comparison of the last two glacial inceptions via fully coupled transient ice and climate modelling., EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-16335,, 2023.