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

Seroussi, Hélène; Nowicki, Sophie; Simon, Erika; Abe-Ouchi, Ayako; Albrecht, Torsten; Brondex, Julien; Cornford, Stephen; Dumas, Christophe; Gillet-Chaulet, Fabien; Goelzer, Heiko; Golledge, Nicholas R.; Gregory, Jonathan M.; Greve, Ralf; Hoffman, Matthew J.; Humbert, Angelika; Huybrechts, Philippe; Kleiner, Thomas; Larour, Eric; Leguy, Gunter; Lipscomb, William H.; Lowry, Daniel; Mengel, Matthias; Morlighem, Mathieu; Pattyn, Frank; Payne, Anthony J.; Pollard, David; Price, Stephen F.; Quiquet, Aurélien; Reerink, Thomas J.; Reese, Ronja; Rodehacke, Christian B.; Schlegel, Nicole-Jeanne; Shepherd, Andrew; Sun, Sainan; Sutter, Johannes; Van Breedam, Jonas; van de Wal, Roderik S.  W.; Winkelmann, Ricarda; Zhang, Tong

doi:10.5194/tc-13-1441-2019

Title: initMIP-Antarctica: an ice sheet model initialization experiment of ISMIP6

Journal Article · 14 May 2019 · The Cryosphere (Online)

DOI: https://doi.org/10.5194/tc-13-1441-2019 · OSTI ID:1512535

^[1]; Nowicki, Sophie ^[2]; Simon, Erika ^[2];

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^[4]; Brondex, Julien ^[5];

^[6]; Dumas, Christophe ^[7];

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^[9];

^[10];

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^[14]; Huybrechts, Philippe ^[15];

^[16]; Larour, Eric ^[1]; Leguy, Gunter ^[17]; Lipscomb, William H. ^[17] more »

California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Univ. of Tokyo (Japan)
Potsdam Inst. for Climate Impact Research (PIK), Potsdam (Germany)
Univ. Grenoble Alpes (France), CNRS, IRD
Swansea Univ., Swansea (United Kingdom)
Univ. Paris-Saclay, Gif-sur-Yvette (France). Lab. des Sciences du CLimat et de l'Environment
Univ. Grenoble Alpes (France)
Univ. of Utrecht (Netherlands). Inst. for Marine and Atmospheric Research; Univ. Libre de Bruxelles, Brussels (Belgium). Lab. de Glaciologie
Victoria Univ. of Wellington (New Zealand). Antarctic Research Centre
Univ. of Reading (United Kingdom). National Center for Atmospheric Science
Hokkaido Univ., Sapporo (Japan). Inst. of Low Temperature Science
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Fluid Dynamics and Solid Mechanics Group
Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven (Germany); Univ. of Bremen (Germany). Dept. of Geoscience
Vrije Univ., Amsterdam (Netherlands). Earth System Science & Dept. Geografie
Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven (Germany)
National Center for Atmospheric Research, Boulder, CO (United States). Climate and Global Dynamics Lab.
Univ. of California, Irvine, CA (United States). Dept. of Earth System Science
Univ. Libre de Bruxelles, Brussels (Belgium). Lab. de Glaciologie
Univ. of Bristol (United Kingdom)
Pennsylvania State Univ., University Park, PA (United States). Earth and Environmental Systems Inst. (EESI)
Univ. Paris-Saclay, Gif-sur-Yvette (France). Lab. des Sciences de Climat et de l'Environment
Univ. of Utrecht (Netherlands). Inst. for Marine and Atmospheric Research
Danish Meteorological Inst., Copenhagen (Denmark). Arctic and Climate; Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven (Germany)
Univ. of Leeds (United Kingdom)
Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven (Germany); Univ. of Bern (Switzerland). Oeschger Centre for Climate Change Research, Physics Inst., Climate and Environmental Physics
Univ. of Utrecht (Netherlands). Inst. for Marine and Atmospheric Research; Univ. of Utrecht (Netherlands). Geosciences, Physical Geography
Potsdam Inst. for Climate Impact Research (PIK), Potsdam (Germany); Univ. of Potsdam (Germany). Inst. of Physics and Astronomy

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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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1512535

Alternate ID(s):: OSTI ID: 1527171

Journal Information:: The Cryosphere (Online), Vol. 13, Issue 5; ISSN 1994-0424

Publisher:: European Geosciences UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Multidecadal warming of Antarctic waters Schmidtko, Sunke; Heywood, Karen J.; Thompson, Andrew F. Science, Vol. 346, Issue 6214 https://doi.org/10.1126/science.1256117	journal	December 2014
Dynamic thinning of glaciers on the Southern Antarctic Peninsula Wouters, B.; Martin-Espanol, A.; Helm, V. Science, Vol. 348, Issue 6237 https://doi.org/10.1126/science.aaa5727	journal	May 2015
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