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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 conditions andmore » 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:
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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:
Germany
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

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. Germany: 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. Germany. 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". Germany. 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 = {Germany},
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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Cited by: 7 works
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Figures / Tables:

Figure 1 Figure 1: (a) Surface mass balance anomaly (m yr−1) for the asmb experiment and (b) basal melt rate anomaly (m yr−1) for the abmb experiment. Black contours show the current Antarctic ice extent.

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A parameterization of ice shelf–ocean interaction for climate models
journal, January 2003


A mass conservation approach for mapping glacier ice thickness: BALANCE THICKNESS
journal, October 2011

  • Morlighem, M.; Rignot, E.; Seroussi, H.
  • Geophysical Research Letters, Vol. 38, Issue 19
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Calving fluxes and basal melt rates of Antarctic ice shelves
journal, September 2013

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  • Nature, Vol. 502, Issue 7469
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Dynamic thinning of glaciers on the Southern Antarctic Peninsula
journal, May 2015


Multidecadal warming of Antarctic waters
journal, December 2014

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  • Science, Vol. 346, Issue 6214
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The ERA-Interim reanalysis: configuration and performance of the data assimilation system
journal, April 2011

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Sustained increase in ice discharge from the Amundsen Sea Embayment, West Antarctica, from 1973 to 2013
journal, March 2014

  • Mouginot, J.; Rignot, E.; Scheuchl, B.
  • Geophysical Research Letters, Vol. 41, Issue 5
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Ice Sheet Model Intercomparison Project (ISMIP6) contribution to CMIP6
journal, January 2016

  • Nowicki, Sophie M. J.; Payne, Anthony; Larour, Eric
  • Geoscientific Model Development, Vol. 9, Issue 12
  • DOI: 10.5194/gmd-9-4521-2016

Optimal initial conditions for coupling ice sheet models to Earth system models: PEREGO ET AL.
journal, September 2014

  • Perego, Mauro; Price, Stephen; Stadler, Georg
  • Journal of Geophysical Research: Earth Surface, Vol. 119, Issue 9
  • DOI: 10.1002/2014JF003181

Potential Antarctic Ice Sheet retreat driven by hydrofracturing and ice cliff failure
journal, February 2015

  • Pollard, David; DeConto, Robert M.; Alley, Richard B.
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  • DOI: 10.1016/j.epsl.2014.12.035

Retreat of Pine Island Glacier controlled by marine ice-sheet instability
journal, January 2014

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  • Nature Climate Change, Vol. 4, Issue 2
  • DOI: 10.1038/nclimate2094

A two-dimensional model for the thermohaline circulation under an ice shelf
journal, December 1989


Comparison of thermodynamics solvers in the polythermal ice sheet model SICOPOLIS
journal, March 2016


Observed thinning of Totten Glacier is linked to coastal polynya variability
journal, December 2013

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  • Nature Communications, Vol. 4, Issue 1
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Abrupt glacial climate shifts controlled by ice sheet changes
journal, August 2014

  • Zhang, Xu; Lohmann, Gerrit; Knorr, Gregor
  • Nature, Vol. 512, Issue 7514
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Results of the Marine Ice Sheet Model Intercomparison Project, MISMIP
journal, January 2012


Marine ice-sheet profiles and stability under Coulomb basal conditions
journal, January 2015

  • Tsai, Victor C.; Stewart, Andrew L.; Thompson, Andrew F.
  • Journal of Glaciology, Vol. 61, Issue 226
  • DOI: 10.3189/2015JoG14J221

Antarctic subglacial conditions inferred from a hybrid ice sheet/ice stream model
journal, July 2010


World ocean heat content and thermosteric sea level change (0-2000 m), 1955-2010: WORLD OCEAN HEAT CONTENT
journal, May 2012

  • Levitus, S.; Antonov, J. I.; Boyer, T. P.
  • Geophysical Research Letters, Vol. 39, Issue 10
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On the difficulty of modeling Circumpolar Deep Water intrusions onto the Amundsen Sea continental shelf
journal, December 2014


Description and evaluation of the Community Ice Sheet Model (CISM) v2.1
journal, January 2019

  • Lipscomb, William H.; Price, Stephen F.; Hoffman, Matthew J.
  • Geoscientific Model Development, Vol. 12, Issue 1
  • DOI: 10.5194/gmd-12-387-2019

The safety band of Antarctic ice shelves
journal, February 2016

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  • Nature Climate Change, Vol. 6, Issue 5
  • DOI: 10.1038/nclimate2912

A new, high-resolution surface mass balance map of Antarctica (1979-2010) based on regional atmospheric climate modeling: SMB ANTARCTICA
journal, February 2012

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  • Geophysical Research Letters, Vol. 39, Issue 4
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Binge/purge oscillations of the Laurentide Ice Sheet as a cause of the North Atlantic's Heinrich events
journal, December 1993


MPAS-Albany Land Ice (MALI): a variable-resolution ice sheet model for Earth system modeling using Voronoi grids
journal, January 2018

  • Hoffman, Matthew J.; Perego, Mauro; Price, Stephen F.
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  • DOI: 10.5194/gmd-11-3747-2018

Spatial distribution of net surface accumulation on the Antarctic ice sheet
journal, January 2000


A 3-D model for the Antarctic ice sheet: a sensitivity study on the glacial-interglacial contrast
journal, December 1990


Ice shelf basal melt rates around Antarctica from simulations and observations: ICE SHELF BASAL MELT AROUND ANTARCTICA
journal, February 2016

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  • Journal of Geophysical Research: Oceans, Vol. 121, Issue 2
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A variational approach to ice stream flow
journal, May 2006


Marine Ice Sheet Collapse Potentially Under Way for the Thwaites Glacier Basin, West Antarctica
journal, May 2014


Modelling the climate and surface mass balance of polar ice sheets using RACMO2 – Part 2: Antarctica (1979–2016)
journal, January 2018

  • van Wessem, Jan Melchior; van de Berg, Willem Jan; Noël, Brice P. Y.
  • The Cryosphere, Vol. 12, Issue 4
  • DOI: 10.5194/tc-12-1479-2018

Rapid disintegration of the Wordie Ice Shelf in response to atmospheric warming
journal, March 1991

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Mapping technique of climate fields between GCM's and ice models
journal, January 2010

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Sensitivity of the dynamics of Pine Island Glacier, West Antarctica, to climate forcing for the next 50 years
journal, January 2014


High tide of the warm Pliocene: Implications of global sea level for Antarctic deglaciation
journal, March 2012

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  • Geology, Vol. 40, Issue 5
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