Implementation and Initial Evaluation of the Glimmer Community Ice Sheet Model in the Community Earth System Model

TitleImplementation and Initial Evaluation of the Glimmer Community Ice Sheet Model in the Community Earth System Model
Publication TypeJournal Article
Year of Publication2013
Authors
JournalJournal of Climate
Date Published09/2013
Abstract / Summary

The Glimmer Community Ice Sheet Model (Glimmer-CISM) has been implemented in the Community Earth System Model (CESM). Glimmer-CISM is forced by a surface mass balance (SMB) computed in multiple elevation classes in CESM’s land model and downscaled to the ice sheet grid. Ice sheet evolution is governed by the shallow-ice approximation with thermomechanical coupling and basal sliding. This paper describes and evaluates the initial model implementation for the Greenland Ice Sheet (GIS). The ice sheet model was spun up using the SMB from a coupled CESM simulation with preindustrial forcing. The model’s sensitivity to three key ice sheet parameters was explored by running an ensemble of GIS simulations to quasi-equilibrium and ranking each simulation based on multiple diagnostics. With reasonable parameter choices, the steady-state GIS geometry is broadly consistent with observations. The simulated ice sheet is too thick and extensive, however, in some marginal regions where the SMB is anomalously positive. The top-ranking simulations were continued using surface forcing from CESM simulations of the 20th century (1850-2005) and 21st century (2005-2100, with RCP8.5 forcing). In these simulations the GIS loses mass, with resulting global mean sea-level rise of 16 mm during 1850-2005 and 60 mm during 2005-2100. This mass loss is caused mainly by increased ablation near the ice sheet margin, offset by reduced ice discharge to the ocean. Projected sea-level rise is sensitive to the initial geometry, showing the importance of realistic geometry in the spun-up ice sheet.

URLhttp://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-12-00557.1
DOI10.1175/JCLI-D-12-00557.1
Journal: Journal of Climate
Year of Publication: 2013
Date Published: 09/2013

The Glimmer Community Ice Sheet Model (Glimmer-CISM) has been implemented in the Community Earth System Model (CESM). Glimmer-CISM is forced by a surface mass balance (SMB) computed in multiple elevation classes in CESM’s land model and downscaled to the ice sheet grid. Ice sheet evolution is governed by the shallow-ice approximation with thermomechanical coupling and basal sliding. This paper describes and evaluates the initial model implementation for the Greenland Ice Sheet (GIS). The ice sheet model was spun up using the SMB from a coupled CESM simulation with preindustrial forcing. The model’s sensitivity to three key ice sheet parameters was explored by running an ensemble of GIS simulations to quasi-equilibrium and ranking each simulation based on multiple diagnostics. With reasonable parameter choices, the steady-state GIS geometry is broadly consistent with observations. The simulated ice sheet is too thick and extensive, however, in some marginal regions where the SMB is anomalously positive. The top-ranking simulations were continued using surface forcing from CESM simulations of the 20th century (1850-2005) and 21st century (2005-2100, with RCP8.5 forcing). In these simulations the GIS loses mass, with resulting global mean sea-level rise of 16 mm during 1850-2005 and 60 mm during 2005-2100. This mass loss is caused mainly by increased ablation near the ice sheet margin, offset by reduced ice discharge to the ocean. Projected sea-level rise is sensitive to the initial geometry, showing the importance of realistic geometry in the spun-up ice sheet.

DOI: 10.1175/JCLI-D-12-00557.1
Citation:
2013.  "Implementation and Initial Evaluation of the Glimmer Community Ice Sheet Model in the Community Earth System Model."  Journal of Climate.  https://doi.org/10.1175/JCLI-D-12-00557.1.