Modelling the Northern Hemisphere ice sheet evolution during the last deglaciation and MIS-11 with an ice sheet-ice shelf coupled model
(2025) The 7th PAGES Open Science Meeting — Location: Shanghai, China (21.May.2025)
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- Abstract
- Ice sheet models are essential tools for studying ice sheet dynamics in response to the climate evolution during the Quaternary glacial-interglacial cycles. Here, we develop a new version of the Northern Hemisphere ice sheet model (NHISM, Zweck and Huybrechts, 2005) by adding a user-friendly ice shelf module and other new characteristics such as the option to easily change the horizontal resolution. This new ice sheet-ice shelf coupled model is named NHISM1.1. The ice shelf module is based on the shallow shelf approximation, allowing simulation of ice stream advance into the ocean and the transformation between floating and grounded ice. NHISM1.1 is first used to conduct equilibrium ice-sheet simulations driven by observed present-day climate. It simulates a reasonable spatial distribution of the Northern Hemisphere ice sheets with a bias of less than 10% in the Greenland Ice Sheet volume compared to observation. We then use NHISM1.1 to perform transient ice sheet simulations for two distinct periods in the past, the Last Deglaciation and the entire MIS-11 period. In both cases, NHISM1.1 is driven by climate outputs of transient simulations performed with the LOVECLIM1.3 model. The performance of NHISM1.1 and the influence of various model configuration is evaluated by comparison with proxy reconstructions and other model simulations as well as sensitivity experiments. Our results show that the results are largely consistent with geological evidence and that the incorporation of an ice shelf module is critical in properly reproducing glacial inception in ice sheet simulations.
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Citations
Liu, W., Yin, Q., Huybrechts, P., & Goelzer, H. (2025). Modelling the Northern Hemisphere ice sheet evolution during the last deglaciation and MIS-11 with an ice sheet-ice shelf coupled model. The 7th PAGES Open Science Meeting, Shanghai, China. https://hdl.handle.net/2078.5/268782