CESM Land Ice Documentation and User Guide

Table of contents

• 1. Introduction
  • 1.1. The Community Ice Sheet Model
  • 1.2. Scientific background
  • 1.3. Ice sheets in CESM
  • 1.4. Limitations
    • 1.4.1. Limitations of the ice sheet model itself
    • 1.4.2. Limitations of CISM within CESM
    • 1.4.3. Limitations of other components of the CESM modeling system
  • 1.5. What’s new in CESM2.0 with respect to ice sheet modeling?
  • 1.6. Significant changes since CESM2.0
• 2. Running and modifying the CESM land ice component
  • 2.1. Choosing a CESM configuration for land ice work
    • 2.1.1. Choosing a compset
    • 2.1.2. Choosing a CISM grid
    • 2.1.3. Special considerations for hybrid cases
  • 2.2. Modifying namelist settings
  • 2.3. Modifying source code
    • 2.3.1. Source code directory structure and repositories
• 3. Running the fully-coupled ice sheet model within CESM: B compsets
  • 3.1. Helpful links for coupling information
  • 3.2. CISM Time Steps
  • 3.3. CISM Topography Updating Workflow
• 4. Running the standalone ice sheet model within CESM: T compsets
  • 4.1. Background
  • 4.2. Running with existing forcing data
  • 4.3. Creating and running with your own forcing data
    • 4.3.1. Performing a run to create forcing data
    • 4.3.2. Performing a T compset run using your own forcing data
  • 4.4. Changes to some CESM defaults for T compsets
• 5. Controlling output from CISM and CLM
  • 5.1. Controlling CISM output
  • 5.2. Producing land ice-specific output from CLM
    • 5.2.1. Outputting forcing fields sent from CLM to CISM
    • 5.2.2. Adding a CLM history field that provides averages only over ice
• 6. Coupling CLM and CISM
  • 6.1. Modes of coupling CLM and CISM
    • 6.1.1. Non-evolving ice sheet
    • 6.1.2. Evolving ice sheet with two-way (interactive) coupling
    • 6.1.3. Evolving ice sheet with one-way (diagnostic) coupling
    • 6.1.4. Stub GLC model (CISM absent)
  • 6.2. Brief overview of CLM-CISM coupling
  • 6.3. Resetting CLM’s baseline states for dynamic landunits
    • 6.3.1. Overview of CLM’s dynbal fluxes
    • 6.3.2. Further reducing dynbal fluxes via reset_dynbal_baselines
    • 6.3.3. Confirming that the dynbal fluxes are small in your simulation
    • 6.3.4. More details and thoughts on these dynbal fluxes
  • 6.4. Fields exchanged between CLM and CISM
    • 6.4.1. CLM to CISM
    • 6.4.2. CISM to CLM
    • 6.4.3. Other fields sent from CISM
  • 6.5. Remapping fields sent from CLM to CISM
    • 6.5.1. Remapping surface mass balance from CLM to CISM
    • 6.5.2. Remapping surface temperature from CLM to CISM
  • 6.6. CLM’s glacier regions and their behaviors
• 7. Acknowledgments
• 8. References

Appendices

• A.1 Introducing a new ice sheet grid
  • A.1.1 Prerequisites
  • A.1.2 Modifications needed for CISM
  • A.1.3 Modifications needed for CLM
  • A.1.4 Generating the necessary inter-component mapping files
• A.2 Introducing a new ice sheet
  • A.2.1 Changes needed in the CISM-wrapper repository
  • A.2.2 Changes needed in other repositories
  • A.2.3 Caveats when adding a new ice sheet

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