An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability

Abstract Spinning up a highly complex, coupled Earth system model (ESM) is a time consuming and computationally demanding exercise. For models with interactive ice sheet components, this becomes a major challenge, as ice sheets are sensitive to bidirectional feedback processes and equilibrate over g...

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Autores principales:	Marcus Lofverstrom, Jeremy G. Fyke, Katherine Thayer‐Calder, Laura Muntjewerf, Miren Vizcaino, William J. Sacks, William H. Lipscomb, Bette L. Otto‐Bliesner, Sarah L. Bradley
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2020
Materias:	Community Earth System Model version 2 (CESM2) Coupled ice‐sheet/Earth system modeling Interactive ice sheets Spin‐up simulation Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/d7c6d0d9dba242e5aa21034401810ea5
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spelling	oai:doaj.org-article:d7c6d0d9dba242e5aa21034401810ea52021-11-15T14:20:27ZAn Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability1942-246610.1029/2019MS001984https://doaj.org/article/d7c6d0d9dba242e5aa21034401810ea52020-08-01T00:00:00Zhttps://doi.org/10.1029/2019MS001984https://doaj.org/toc/1942-2466Abstract Spinning up a highly complex, coupled Earth system model (ESM) is a time consuming and computationally demanding exercise. For models with interactive ice sheet components, this becomes a major challenge, as ice sheets are sensitive to bidirectional feedback processes and equilibrate over glacial timescales of up to many millennia. This work describes and demonstrates a computationally tractable, iterative procedure for spinning up a contemporary, highly complex ESM that includes an interactive ice sheet component. The procedure alternates between a computationally expensive coupled configuration and a computationally cheaper configuration where the atmospheric component is replaced by a data model. By periodically regenerating atmospheric forcing consistent with the coupled system, the data atmosphere remains adequately constrained to ensure that the broader model state evolves realistically. The applicability of the method is demonstrated by spinning up the preindustrial climate in the Community Earth System Model Version 2 (CESM2), coupled to the Community Ice Sheet Model Version 2 (CISM2) over Greenland. The equilibrium climate state is similar to the control climate from a coupled simulation with a prescribed Greenland ice sheet, indicating that the iterative procedure is consistent with a traditional spin‐up approach without interactive ice sheets. These results suggest that the iterative method presented here provides a faster and computationally cheaper method for spinning up a highly complex ESM, with or without interactive ice sheet components. The method described here has been used to develop the climate/ice sheet initial conditions for transient, ice sheet‐enabled simulations with CESM2‐CISM2 in the Coupled Model Intercomparison Project Phase 6 (CMIP6).Marcus LofverstromJeremy G. FykeKatherine Thayer‐CalderLaura MuntjewerfMiren VizcainoWilliam J. SacksWilliam H. LipscombBette L. Otto‐BliesnerSarah L. BradleyAmerican Geophysical Union (AGU)articleCommunity Earth System Model version 2 (CESM2)Coupled ice‐sheet/Earth system modelingInteractive ice sheetsSpin‐up simulationPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 12, Iss 8, Pp n/a-n/a (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Community Earth System Model version 2 (CESM2) Coupled ice‐sheet/Earth system modeling Interactive ice sheets Spin‐up simulation Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	Community Earth System Model version 2 (CESM2) Coupled ice‐sheet/Earth system modeling Interactive ice sheets Spin‐up simulation Physical geography GB3-5030 Oceanography GC1-1581 Marcus Lofverstrom Jeremy G. Fyke Katherine Thayer‐Calder Laura Muntjewerf Miren Vizcaino William J. Sacks William H. Lipscomb Bette L. Otto‐Bliesner Sarah L. Bradley An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability
description	Abstract Spinning up a highly complex, coupled Earth system model (ESM) is a time consuming and computationally demanding exercise. For models with interactive ice sheet components, this becomes a major challenge, as ice sheets are sensitive to bidirectional feedback processes and equilibrate over glacial timescales of up to many millennia. This work describes and demonstrates a computationally tractable, iterative procedure for spinning up a contemporary, highly complex ESM that includes an interactive ice sheet component. The procedure alternates between a computationally expensive coupled configuration and a computationally cheaper configuration where the atmospheric component is replaced by a data model. By periodically regenerating atmospheric forcing consistent with the coupled system, the data atmosphere remains adequately constrained to ensure that the broader model state evolves realistically. The applicability of the method is demonstrated by spinning up the preindustrial climate in the Community Earth System Model Version 2 (CESM2), coupled to the Community Ice Sheet Model Version 2 (CISM2) over Greenland. The equilibrium climate state is similar to the control climate from a coupled simulation with a prescribed Greenland ice sheet, indicating that the iterative procedure is consistent with a traditional spin‐up approach without interactive ice sheets. These results suggest that the iterative method presented here provides a faster and computationally cheaper method for spinning up a highly complex ESM, with or without interactive ice sheet components. The method described here has been used to develop the climate/ice sheet initial conditions for transient, ice sheet‐enabled simulations with CESM2‐CISM2 in the Coupled Model Intercomparison Project Phase 6 (CMIP6).
format	article
author	Marcus Lofverstrom Jeremy G. Fyke Katherine Thayer‐Calder Laura Muntjewerf Miren Vizcaino William J. Sacks William H. Lipscomb Bette L. Otto‐Bliesner Sarah L. Bradley
author_facet	Marcus Lofverstrom Jeremy G. Fyke Katherine Thayer‐Calder Laura Muntjewerf Miren Vizcaino William J. Sacks William H. Lipscomb Bette L. Otto‐Bliesner Sarah L. Bradley
author_sort	Marcus Lofverstrom
title	An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability
title_short	An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability
title_full	An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability
title_fullStr	An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability
title_full_unstemmed	An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability
title_sort	efficient ice sheet/earth system model spin‐up procedure for cesm2‐cism2: description, evaluation, and broader applicability
publisher	American Geophysical Union (AGU)
publishDate	2020
url	https://doaj.org/article/d7c6d0d9dba242e5aa21034401810ea5
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An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability

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