Community Earth System Model 2 (CESM2)
The latest release in the CESM family including many substantial science and infrastructure improvements since its previous version
Current Release
The supported CESM development release is CESM 2.2.2 and the supported CESM production release is CESM 2.1.5
Note: The CESM2.2.z release is not a scientifically supported version; that is, we do not have any long simulations with this model version yet. In most cases, users should continue to use the CESM2.1.z series for their science and especially for CMIP6-related simulations.
Scientific Validation
Scientific validation consists of a multi-decadal model run of the given component set at the target resolution, followed by scientific review of the model output diagnostics.
* This page now contains links to datasets on ESGF, CDG, glade and NCAR HPSS as well as diagnostic plots and caseroot details.
Use Cases
Listed below are several common use cases with links into the corresponding on-line documentation.
- Running CESM2 on a supported machine using a scientifically supported out-of-the-box configuration
- Creating, setting up and building a CESM2 case
- CESM2 Component Configuration Settings for component namelist and XML input parameters.
- Postprocessing CESM2 output data on NCAR supported machines using parallel python tools
- Verifying the port of CESM2 to a new machine
- Getting help as a registered user of the DiscussCESM Forums
Prognostic Components
Each model component page contains descriptions and documentation for active or prognostic models.
CIME Documentation
Common Infrastructure for Modeling the Earth contains the coupling infrastructure, support scripts, data models and utility libraries needed to create a single-executable coupled Earth System Model.
* CIME does not contain any prognostics components and is available in a stand-alone package that can be compiled and tested with just its data components.
Configurations and Grids
Component configurations include settings required for CIME enabled models; both prognostic and data model components. These settings include:
* Includes Fortran namelists and CASEROOT variable definitions
Supported Machines & Performance Data
External Library Documentation
- Parallel I/O Library (PIO)
- Model Coupling Toolkit (MCT)
- Earth System Modeling Framework (ESMF)
- External Python Based Tools*
* Support for these tools is currently limited to NCAR machines only
Model Input Data
As of CESM2, the input data necessary to run all supported component sets is made available from a number of different public repositories including:
Important
Do not attempt to checkout the whole input data repository, it is currently over 20 TB
Note
The CIME User Guide explains how to obtain the subset of input data required for your needs