Preprints
https://doi.org/10.5194/gmd-2021-136
https://doi.org/10.5194/gmd-2021-136

Submitted as: model description paper 03 May 2021

Submitted as: model description paper | 03 May 2021

Review status: a revised version of this preprint is currently under review for the journal GMD.

A Gaussian process emulator for simulating ice sheet-climate interactions on a multi-million year timescale: CLISEMv1.0

Jonas Van Breedam1, Philippe Huybrechts1, and Michel Crucifix2 Jonas Van Breedam et al.
  • 1Earth System Science & Departement Geografie, Vrije Universiteit Brussel, Brussels, Belgium
  • 2Georges Lemaître Centre for Earth and Climate Research (TECLIM), Earth and Life Institute, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

Abstract. On multi-million year timescales, fully coupled ice sheet – climate simulations are hampered by computational limitations, even at coarser resolutions and when considering asynchronous coupling schemes. In this study, a novel coupling method CLISEMv1.0 (CLimate-Ice Sheet EMulator version 1.0) is presented where a Gaussian process emulator is applied to the climate model HadSM3 coupled to the ice sheet model AISMPALEO. The temperature and precipitation fields from HadSM3 are emulated to feed the mass balance model from AISMPALEO. The sensitivity of the evolution of the ice sheet over time is tested to the number of predefined ice sheet geometries the emulator is calibrated on, to the formulation of the ice sheet parameter (being either ice sheet volume, either ice sheet area, or both) and to the coupling time. Sensitivity experiments are conducted to explore the uncertainty introduced by the emulator. Additionally, different lapse rate adjustments are used between the relatively coarse climate model and the much finer ice sheet model topography. It is shown that the ice sheet evolution over a million-year timescale is strongly sensitive to the definition of the ice sheet parameter and to the number of predefined ice sheet geometries. With the new coupling procedure, we provide a computationally efficient framework for simulating ice sheet-climate interactions on a multi-million year timescale that allows for a large number of sensitivity tests.

Jonas Van Breedam et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2021-136', Anonymous Referee #1, 03 Jun 2021
  • RC2: 'Comment on gmd-2021-136', Anonymous Referee #2, 07 Jun 2021

Jonas Van Breedam et al.

Jonas Van Breedam et al.

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Short summary
Ice sheets are an important component of the climate system and interact with the atmosphere through albedo variations and changes in the surface height. On very long timescales, it is impossible to directly couple ice sheet models with climate models and other techniques have to be used. Here we present a novel coupling method between ice sheets and the atmosphere by making use of an emulator to simulate ice sheet-climate interactions for several million years.