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Discussion papers
https://doi.org/10.5194/tc-2018-271
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2018-271
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 17 Jan 2019

Research article | 17 Jan 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal The Cryosphere (TC).

initMIP-Antarctica: An ice sheet model initialization experiment of ISMIP6

Hélène Seroussi1, Sophie Nowicki2, Erika Simon2, Ayako Abe Ouchi3, Torsten Albrecht4, Julien Brondex5, Stephen Cornford6, Christophe Dumas7, Fabien Gillet-Chaulet5, Heiko Goelzer8,9, Nicholas R. Golledge10, Jonathan M. Gregory11, Ralf Greve12, Matthew J. Hoffman13, Angelika Humbert14,15, Philippe Huybrechts16, Thomas Kleiner14, Eric Larour1, Gunter Leguy17, William H. Lipscomb17, Daniel Lowry10, Matthias Mengel4, Mathieu Morlighem18, Frank Pattyn9, Anthony J. Payne19, David Pollard20, Stephen Price13, Aurélien Quiquet7, Thomas Reerink8, Ronja Reese4, Christian B. Rodehacke21,14, Nicole-Jeanne Schlegel1, Andrew Shepherd22, Sainan Sun9, Johannes Sutter14, Jonas Van Breedam16, Roderik S. W. van de Wal8, Ricarda Winkelmann4, and Tong Zhang13 Hélène Seroussi et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
  • 2NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 3University of Tokyo, Japan
  • 4Potsdam Institute for Climate Impact Research, Germany
  • 5Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, 38000 Grenoble, France
  • 6Swansea University, UK
  • 7Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
  • 8Institute for Marine and Atmospheric research Utrecht, Utrecht University, the Netherlands
  • 9Laboratoire de Glaciologie, Université libre de Bruxelles, Belgium
  • 10Antarctic Research Centre, Victoria University of Wellington, New Zealand
  • 11University of Reading, UK
  • 12Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan
  • 13Los Alamos National Laboratory, NM, USA
  • 14Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
  • 15University of Bremen, Germany
  • 16Earth System Science & Departement Geografie, Vrije Universiteit Brussel, Belgium
  • 17National Center for Atmospheric Research, Boulder, CO, USA
  • 18Department of Earth System Science, University of California Irvine, Irvine, CA, USA
  • 19University of Bristol, UK
  • 20Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, USA
  • 21Danish Meteorological Institute, Copenhagen, Denmark
  • 22University of Leeds, UK

Abstract. Ice sheet numerical modeling is the best approach to estimate the dynamic contribution of Antarctica to sea level rise over the coming centuries. The influence of initial conditions on ice sheet model simulations, however, is still unclear. To better understand this influence, an initial state intercomparison exercise (initMIP) has been developed to compare, evaluate, and improve initialization procedures and estimate their impact on century-scale simulations. initMIP is the first set of experiments of the Ice Sheet Model Intercomparison Project for CMIP6 (ISMIP6), which is the primary Coupled Model Intercomparison Project Phase 6 (CMIP6) activity focusing on the Greenland and Antarctic Ice Sheets. Following initMIP-Greenland, initMIP-Antarctica has been designed to explore uncertainties associated with model initialization and spin-up and to evaluate the impact of changes in external forcings. Starting from the state of the Antarctic ice sheet at the end of the initialization procedure, three forward experiments are each run for 100 years: a control run, a run with a surface mass balance (SMB) anomaly, and a run with a basal melting anomaly beneath floating ice. This study presents the results of initMIP-Antarctica from 25 simulations performed by 16 international modeling groups. The submitted results use different initial conditions and initialization methods, as well as ice flow model parameters and reference external forcings. We find a good agreement among model responses to the SMB anomaly, but large variations in responses to the basal melting anomaly. These variations can be attributed to differences in the extent of ice shelves and their upstream tributaries, the numerical treatment of grounding line, as well as the initial ocean conditions applied, suggesting that ongoing efforts to better represent ice shelves in continental-scale models should continue.

Hélène Seroussi et al.
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