Earth system/ice‐sheet coupling is an area of recent, major Earth System Model (ESM) development. This work occurs at the intersection of glaciology and climate science and is motivated by a need for robust projections of sea‐level rise. The Community Ice Sheet Model version 2 (CISM2) is the newest component model of the Community Earth System Model version 2 (CESM2). This study describes the coupling and novel capabilities of the model, including: (1) an advanced energy‐balance‐based surface mass balance calculation in the land component with downscaling via elevation classes; (2) a closed freshwater budget from ice sheet to the ocean from surface runoff, basal melting, and ice discharge; (3) dynamic land surface types; and (4) dynamic atmospheric topography. The Earth system/ice‐sheet coupling is demonstrated in a simulation with an evolving Greenland Ice Sheet (GrIS) under an idealized high CO 2 scenario. The model simulates a large expansion of ablation areas (where surface ablation exceeds snow accumulation) and a large increase in surface runoff. This results in an elevated freshwater flux to the ocean, as well as thinning of the ice sheet and area retreat. These GrIS changes result in reduced Greenland surface albedo, changes in the sign and magnitude of sensible and latent heat fluxes, and modified surface roughness and overall ice sheet topography. Representation of these couplings between climate and ice sheets is key for the simulation of ice and climate interactions.
Muntjewerf, Laura, et al. "Description and Demonstration of the Coupled Community Earth System Model v2 – Community Ice Sheet Model v2 (CESM2‐CISM2)." Journal of Advances in Modeling Earth Systems, vol. 13, no. 6, Jun. 2021. https://doi.org/10.1029/2020MS002356
Muntjewerf, Laura, Sacks, William J., Lofverstrom, Marcus, Fyke, Jeremy, Lipscomb, William H., Ernani da Silva, Carolina, Vizcaino, Miren, Thayer‐Calder, Katherine, Lenaerts, Jan T. M., & Sellevold, Raymond (2021). Description and Demonstration of the Coupled Community Earth System Model v2 – Community Ice Sheet Model v2 (CESM2‐CISM2). Journal of Advances in Modeling Earth Systems, 13(6). https://doi.org/10.1029/2020MS002356
Muntjewerf, Laura, Sacks, William J., Lofverstrom, Marcus, et al., "Description and Demonstration of the Coupled Community Earth System Model v2 – Community Ice Sheet Model v2 (CESM2‐CISM2)," Journal of Advances in Modeling Earth Systems 13, no. 6 (2021), https://doi.org/10.1029/2020MS002356
@article{osti_1798387,
author = {Muntjewerf, Laura and Sacks, William J. and Lofverstrom, Marcus and Fyke, Jeremy and Lipscomb, William H. and Ernani da Silva, Carolina and Vizcaino, Miren and Thayer‐Calder, Katherine and Lenaerts, Jan T. M. and Sellevold, Raymond},
title = {Description and Demonstration of the Coupled Community Earth System Model v2 – Community Ice Sheet Model v2 (CESM2‐CISM2)},
annote = {Abstract Earth system/ice‐sheet coupling is an area of recent, major Earth System Model (ESM) development. This work occurs at the intersection of glaciology and climate science and is motivated by a need for robust projections of sea‐level rise. The Community Ice Sheet Model version 2 (CISM2) is the newest component model of the Community Earth System Model version 2 (CESM2). This study describes the coupling and novel capabilities of the model, including: (1) an advanced energy‐balance‐based surface mass balance calculation in the land component with downscaling via elevation classes; (2) a closed freshwater budget from ice sheet to the ocean from surface runoff, basal melting, and ice discharge; (3) dynamic land surface types; and (4) dynamic atmospheric topography. The Earth system/ice‐sheet coupling is demonstrated in a simulation with an evolving Greenland Ice Sheet (GrIS) under an idealized high CO 2 scenario. The model simulates a large expansion of ablation areas (where surface ablation exceeds snow accumulation) and a large increase in surface runoff. This results in an elevated freshwater flux to the ocean, as well as thinning of the ice sheet and area retreat. These GrIS changes result in reduced Greenland surface albedo, changes in the sign and magnitude of sensible and latent heat fluxes, and modified surface roughness and overall ice sheet topography. Representation of these couplings between climate and ice sheets is key for the simulation of ice and climate interactions. },
doi = {10.1029/2020MS002356},
url = {https://www.osti.gov/biblio/1798387},
journal = {Journal of Advances in Modeling Earth Systems},
issn = {ISSN 1942-2466},
number = {6},
volume = {13},
place = {United States},
publisher = {American Geophysical Union (AGU)},
year = {2021},
month = {06}}
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 364, Issue 1844https://doi.org/10.1098/rsta.2006.1796