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

Research output: Contribution to journalArticle

  • Helene Seroussi
  • Sophie Nowicki
  • Erika Simon
  • Ayako Abe-Ouchi
  • Torsten Albrecht
  • Julien Brondex
  • Stephen Cornford
  • Christophe Dumas
  • Fabien Gillet-Chaulet
  • Heiko Goelzer
  • Nicholas R. Golledge
  • Jonathan M. Gregory
  • Ralf Greve
  • Matthew J. Hoffman
  • Angelika Humbert
  • Philippe Huybrechts
  • Thomas Kleiner
  • Eric Larour
  • Gunter Leguy
  • William H. Lipscomb
  • Daniel Lowry
  • Matthias Mengel
  • Mathieu Morlighem
  • Frank Pattyn
  • Anthony J. Paynehttp://orcid.org/0000-0001-8825-8425
  • David Pollard
  • Stephen F. Price
  • Aurelien Quiquet
  • Thomas J. Reerink
  • Ronja Reese
  • Christian B. Rodehacke
  • Nicole Jeanne Schlegel
  • Andrew Shepherd
  • Sainan Sun
  • Johannes Sutter
  • Jonas Van Breedam
  • Roderik S.W. Van De Wal
  • Ricarda Winkelmann
  • Tong Zhang
Original languageEnglish
Pages (from-to)1441-1471
Number of pages31
JournalCryosphere
Volume13
Issue number5
DOIs
DateAccepted/In press - 24 Apr 2019
DatePublished (current) - 14 May 2019

Abstract

Ice sheet numerical modeling is an important tool to estimate the dynamic contribution of the Antarctic ice sheet 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 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 surface mass balance 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, and the initial ocean conditions applied, suggesting that ongoing efforts to better represent ice shelves in continental-scale models should continue.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Copernicus at https://doi.org/10.5194/tc-13-1441-2019 . Please refer to any applicable terms of use of the publisher.

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