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

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 conditionsmore » 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.« less

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [4];  [5]; ORCiD logo [6];  [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [11]; ORCiD logo [12]; ORCiD logo [13]; ORCiD logo [14];  [15]; ORCiD logo [16];  [1];  [17];  [17] more »; ORCiD logo [10]; ORCiD logo [4]; ORCiD logo [18]; ORCiD logo [19];  [20];  [21]; ORCiD logo [13]; ORCiD logo [22]; ORCiD logo [23]; ORCiD logo [4]; ORCiD logo [24]; ORCiD logo [1];  [25];  [19];  [26]; ORCiD logo [15];  [27]; ORCiD logo [28];  [13] « less
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
  2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  3. Univ. of Tokyo (Japan)
  4. Potsdam Inst. for Climate Impact Research (PIK), Potsdam (Germany)
  5. Univ. Grenoble Alpes (France), CNRS, IRD
  6. Swansea Univ., Swansea (United Kingdom)
  7. Univ. Paris-Saclay, Gif-sur-Yvette (France). Lab. des Sciences du CLimat et de l'Environment
  8. Univ. Grenoble Alpes (France)
  9. Univ. of Utrecht (Netherlands). Inst. for Marine and Atmospheric Research; Univ. Libre de Bruxelles, Brussels (Belgium). Lab. de Glaciologie
  10. Victoria Univ. of Wellington (New Zealand). Antarctic Research Centre
  11. Univ. of Reading (United Kingdom). National Center for Atmospheric Science
  12. Hokkaido Univ., Sapporo (Japan). Inst. of Low Temperature Science
  13. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Fluid Dynamics and Solid Mechanics Group
  14. Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven (Germany); Univ. of Bremen (Germany). Dept. of Geoscience
  15. Vrije Univ., Amsterdam (Netherlands). Earth System Science & Dept. Geografie
  16. Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven (Germany)
  17. National Center for Atmospheric Research, Boulder, CO (United States). Climate and Global Dynamics Lab.
  18. Univ. of California, Irvine, CA (United States). Dept. of Earth System Science
  19. Univ. Libre de Bruxelles, Brussels (Belgium). Lab. de Glaciologie
  20. Univ. of Bristol (United Kingdom)
  21. Pennsylvania State Univ., University Park, PA (United States). Earth and Environmental Systems Inst. (EESI)
  22. Univ. Paris-Saclay, Gif-sur-Yvette (France). Lab. des Sciences de Climat et de l'Environment
  23. Univ. of Utrecht (Netherlands). Inst. for Marine and Atmospheric Research
  24. Danish Meteorological Inst., Copenhagen (Denmark). Arctic and Climate; Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven (Germany)
  25. Univ. of Leeds (United Kingdom)
  26. 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
  27. Univ. of Utrecht (Netherlands). Inst. for Marine and Atmospheric Research; Univ. of Utrecht (Netherlands). Geosciences, Physical Geography
  28. Potsdam Inst. for Climate Impact Research (PIK), Potsdam (Germany); Univ. of Potsdam (Germany). Inst. of Physics and Astronomy
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1512535
Alternate Identifier(s):
OSTI ID: 1527171
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
The Cryosphere (Online)
Additional Journal Information:
Journal Name: The Cryosphere (Online); Journal Volume: 13; Journal Issue: 5; Journal ID: ISSN 1994-0424
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English

Citation Formats

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, and Zhang, Tong. initMIP-Antarctica: an ice sheet model initialization experiment of ISMIP6. United States: N. p., 2019. Web. doi:10.5194/tc-13-1441-2019.
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. initMIP-Antarctica: an ice sheet model initialization experiment of ISMIP6. United States. doi:10.5194/tc-13-1441-2019.
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, and Zhang, Tong. Tue . "initMIP-Antarctica: an ice sheet model initialization experiment of ISMIP6". United States. doi:10.5194/tc-13-1441-2019.
@article{osti_1512535,
title = {initMIP-Antarctica: an ice sheet model initialization experiment of ISMIP6},
author = {Seroussi, Hélène and Nowicki, Sophie and Simon, Erika and Abe-Ouchi, Ayako and Albrecht, Torsten and Brondex, Julien and Cornford, Stephen and Dumas, Christophe and Gillet-Chaulet, Fabien and Goelzer, Heiko and Golledge, Nicholas R. and Gregory, Jonathan M. and Greve, Ralf and Hoffman, Matthew J. and Humbert, Angelika and Huybrechts, Philippe and Kleiner, Thomas and Larour, Eric and Leguy, Gunter and Lipscomb, William H. and Lowry, Daniel and Mengel, Matthias and Morlighem, Mathieu and Pattyn, Frank and Payne, Anthony J. and Pollard, David and Price, Stephen F. and Quiquet, Aurélien and Reerink, Thomas J. and Reese, Ronja and Rodehacke, Christian B. and Schlegel, Nicole-Jeanne and Shepherd, Andrew and Sun, Sainan and Sutter, Johannes and Van Breedam, Jonas and van de Wal, Roderik S. W. and Winkelmann, Ricarda and Zhang, Tong},
abstractNote = {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.},
doi = {10.5194/tc-13-1441-2019},
journal = {The Cryosphere (Online)},
number = 5,
volume = 13,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.5194/tc-13-1441-2019

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