Preprints
https://doi.org/10.5194/gmd-2021-204
https://doi.org/10.5194/gmd-2021-204

Submitted as: model description paper 26 Jul 2021

Submitted as: model description paper | 26 Jul 2021

Review status: this preprint is currently under review for the journal GMD.

GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr

Zhiang Xie1,2, Dietmar Dommenget1,2, Felicity S. McCormack1, and Andrew N. Mackintosh1 Zhiang Xie et al.
  • 1Monash University, School of Earth, Atmosphere and Environment, Clayton, Victoria 3800, Australia
  • 2ARC Centre of Excellence for Climate Extremes, Australia

Abstract. We introduce a newly developed global ice sheet model coupled to the Globally Resolved Energy Balance (GREB) climate model for the simulation of global ice sheet evolution on time scales of 100 kyr or longer (GREB-ISM v0.3). Ice sheets and ice shelves are simulated on a global grid, fully interacting with the climate simulation of surface temperature, precipitation, albedo, land-sea mask, topography and sea level. Thus, it is a fully coupled atmosphere, ocean, land and ice sheet model. We test the model in ice sheet stand-alone and fully coupled simulations. The ice sheet model dynamics behave similarly to other hybrid SIA (Shallow Ice Approximation) and SSA (Shallow Shelf Approximation) models, but the West Antarctic Ice Sheet accumulates too much ice using present-day boundary conditions. The coupled model simulations produce global equilibrium ice sheet volumes and calving rates similar to observed for present day boundary conditions. We designed a series of idealised experiments driven by oscillating solar radiation forcing on periods of 20 kyr, 50 kyr and 100 kyr in the Northern Hemisphere. These simulations show clear interactions between the climate system and ice sheets, resulting in slow build-up and fast decay of ice-covered areas and global ice volume. The results also show that Northern Hemisphere ice sheets respond more strongly to time scales longer than 100 kyr. The coupling to the atmosphere and sea level leads to climate interactions between the Northern and Southern Hemispheres. The model can run global simulations of 100 kyr per day on a desktop computer, allowing the simulation of the whole Quaternary period (2.6 Myrs) within one month.

Zhiang Xie et al.

Status: open (extended)

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Zhiang Xie et al.

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Short summary
The paleoclimate research requires better numeric model tool to explore interaction among cryosphere, atmosphere, ocean and surface land. To explore those interaction, this study offers a tool, the GREB-ISM, which can be even run for 2 million model years within one month in a personal computer. A series experiments show that the GREB-ISM is able to reproduce the modern ice sheet distribution as well as classic climate oscillation features under paleoclimate condition.