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

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. LipscombDaniel Lowry, Matthias Mengel, Mathieu Morlighem, Frank Pattyn, Anthony J. Payne, 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

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)1441-1471
Number of pages31
JournalCryosphere
Volume13
Issue number5
DOIs
StatePublished - May 14 2019

Fingerprint

ice sheet
basal melting
anomaly
experiment
ice shelf
mass balance
simulation
floating ice
grounding line
ice flow
modeling
Antarctica
project
tributary
ocean
CMIP

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Earth-Surface Processes

Cite this

Seroussi, H., Nowicki, S., Simon, E., Abe-Ouchi, A., Albrecht, T., Brondex, J., ... Zhang, T. (2019). InitMIP-Antarctica: An ice sheet model initialization experiment of ISMIP6. Cryosphere, 13(5), 1441-1471. https://doi.org/10.5194/tc-13-1441-2019
Seroussi, Helene ; 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, Aurelien ; 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. / InitMIP-Antarctica : An ice sheet model initialization experiment of ISMIP6. In: Cryosphere. 2019 ; Vol. 13, No. 5. pp. 1441-1471.
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Seroussi, H, Nowicki, S, Simon, E, Abe-Ouchi, A, Albrecht, T, Brondex, J, Cornford, S, Dumas, C, Gillet-Chaulet, F, Goelzer, H, Golledge, NR, Gregory, JM, Greve, R, Hoffman, MJ, Humbert, A, Huybrechts, P, Kleiner, T, Larour, E, Leguy, G, Lipscomb, WH, Lowry, D, Mengel, M, Morlighem, M, Pattyn, F, Payne, AJ, Pollard, D, Price, SF, Quiquet, A, Reerink, TJ, Reese, R, Rodehacke, CB, Schlegel, NJ, Shepherd, A, Sun, S, Sutter, J, Van Breedam, J, Van De Wal, RSW, Winkelmann, R & Zhang, T 2019, 'InitMIP-Antarctica: An ice sheet model initialization experiment of ISMIP6', Cryosphere, vol. 13, no. 5, pp. 1441-1471. https://doi.org/10.5194/tc-13-1441-2019

InitMIP-Antarctica : An ice sheet model initialization experiment of ISMIP6. / Seroussi, Helene; 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, Aurelien; 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.

In: Cryosphere, Vol. 13, No. 5, 14.05.2019, p. 1441-1471.

Research output: Contribution to journalArticle

TY - JOUR

T1 - InitMIP-Antarctica

T2 - An ice sheet model initialization experiment of ISMIP6

AU - Seroussi, Helene

AU - Nowicki, Sophie

AU - Simon, Erika

AU - Abe-Ouchi, Ayako

AU - Albrecht, Torsten

AU - Brondex, Julien

AU - Cornford, Stephen

AU - Dumas, Christophe

AU - Gillet-Chaulet, Fabien

AU - Goelzer, Heiko

AU - Golledge, Nicholas R.

AU - Gregory, Jonathan M.

AU - Greve, Ralf

AU - Hoffman, Matthew J.

AU - Humbert, Angelika

AU - Huybrechts, Philippe

AU - Kleiner, Thomas

AU - Larour, Eric

AU - Leguy, Gunter

AU - Lipscomb, William H.

AU - Lowry, Daniel

AU - Mengel, Matthias

AU - Morlighem, Mathieu

AU - Pattyn, Frank

AU - Payne, Anthony J.

AU - Pollard, David

AU - Price, Stephen F.

AU - Quiquet, Aurelien

AU - Reerink, Thomas J.

AU - Reese, Ronja

AU - Rodehacke, Christian B.

AU - Schlegel, Nicole Jeanne

AU - Shepherd, Andrew

AU - Sun, Sainan

AU - Sutter, Johannes

AU - Van Breedam, Jonas

AU - Van De Wal, Roderik S.W.

AU - Winkelmann, Ricarda

AU - Zhang, Tong

PY - 2019/5/14

Y1 - 2019/5/14

N2 - 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.

AB - 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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Seroussi H, Nowicki S, Simon E, Abe-Ouchi A, Albrecht T, Brondex J et al. InitMIP-Antarctica: An ice sheet model initialization experiment of ISMIP6. Cryosphere. 2019 May 14;13(5):1441-1471. https://doi.org/10.5194/tc-13-1441-2019