DMI Report 21-23 A prototype of the coupled EC-Earth-PISM model comprising the Antarctic Ice Sheet

• Main Authors: Rodehacke, Christian B., Madsen, Marianne S, Gierz, Paul
• Format: Other/Unknown Material
• Language: unknown
• Published: Danish Meteorological Institute 2021
• Subjects: Antarctic; Southern Ocean; The Antarctic; Antarc*; Antarctica; Ice Sheet; Ice Shelf; Ice Shelves
• Online Access: https://epic.awi.de/id/eprint/55725/; https://epic.awi.de/id/eprint/55725/1/Rodehacke_Madsen_Gierz2021.pdf; https://www.dmi.dk/fileadmin/Rapporter/2021/DMI_Report_21-23.pdf; https://hdl.handle.net/10013/epic.6e800d7d-2c79-485e-88b3-36487e1e773f; https://hdl.handle.net/

A prototype of a coupled climate-ice sheet model has been developed by the work package 1.1.3 "IskappeANT." The coupled system comprises the climate model EC-Earth and the Parallel Ice Sheet Model (PISM), representing Antarctica. Since the direct implementation of the involved processes, such as the implementation of ice shelf geometries, the ocean-ice shelf interaction, or the computation of the surface mass balance, would exceed the funding period of one year, we exploit state-of-the-art parameterizations. However, the robust system is open for enhancements in consecutive steps afterward and allows exploring scientific frontiers. The coupled system is one of the first state-of-the-art global climate models where the climate system interacts with the Antarctic ice sheet and its fringing ice shelves. This ambitious package includes these tasks: infrastructure to run the Parallel Ice Sheet Model (PISM) version 1.1.4 and version 1.2, setup and configuration of PISM to simulate Antarctica as a standalone model, coupling infrastructure, and first coupled simulations. This document describes the design decisions of the coupling. It presents the analysis of the preindustrial climate state in the Southern Ocean and across Antarctica. These states are subject to sufficiently large biases suggesting anomaly coupling between the climate model and the ice sheet model as an adequate coupling strategy.