CESM Models

CESM1.2 Series Public Release

About This Release Series

The CESM1.2 release has numerous new key features among which are the addition of CLM4.5, new science changes to CAM5 running with the CAM-SE dynamical core, and new scripting infrastructure for the generation of component sets, grids and model testing.

CESM1.2 Series Release Notes

Please read the CESM1.2 Series Release Notes which includes What's New - Science, What's New - Software, Answer-Changing Features, Supported Machines, and Known Problems. The new scripting infrastructure is described in detail in the CESM1.2 User's Guide.

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. All scientifically supported component sets are also accompanied by diagnostic and model output data. Validated CESM1.2 model results and diagnostics will be added to the CESM1.2 website as they become available.

What version of the model should I use?

For a scientifically supported target component set and resolution, please refer to the Scientifically Validated Configurations for that target configuration. For component sets and resolutions that are not scientifically validated in any supported release (e.g. cesm1.0.6 and cesm1.1.2), CSEG strongly urges you to use the latest model release (in this case cesm1.2.2).

Diagnostic Packages and Naming Conventions

Model Documentation

CESM1.2 Atmosphere Models CAM CESM1.2 Atmosphere Models DATM
CESM1.2 Land Models CLM CESM1.2 Land Models DLND
CESM1.2 Sea Ice Models CICE CESM1.2 Sea Ice Models DICE
CESM1.2 Coupler CPL
CESM1.2 Ocean Models POP CESM1.2 Ocean Models DOCN
CESM1.2 Land Ice Models CISM
CESM1.2 River Models RTM CESM1.2 River Models DROF



External Library Documentation

Model Input Data

The input data necessary to run all supported component sets is made available from a public Subversion input data repository. Note that the inputdata repository has much more data in it than you need to run CESM1.2 ---- DO NOT attempt to svn checkout the whole input data repository. The CESM1.2 User's Guide explains how to obtain the subset of input data required for your needs.

Performance and Load Balancing Data

The CESM1.2 Timing Table provides performance data that will continue to evolve due to changes in the model, machine hardware and input from the user community.


CESM Project

The Community Earth System Model (CESM) is a fully-coupled, global climate model that provides state-of-the-art computer simulations of the Earth's past, present, and future climate states.

CESM is sponsored by the National Science Foundation (NSF) and the U.S. Department of Energy (DOE). Administration of the CESM is maintained by the Climate and Global Dynamics Laboratory (CGD) at the National Center for Atmospheric Research (NCAR).

Model Source Code

Copyright and Terms of Use

All CESM source code is subject to the following Copyright Notice and Disclaimer.

Acquiring the Release Code

The source code for CESM releases is distributed through a public Subversion code repository. This code can be checked out using Subversion client software, such as the command tool svn, or simply view the latest version with a web browser.

A short registration is required to access the repository. After registering, you will receive an email containing a user name and password that is necessary to gain access to the repository.

Acquistion of the code is more fully described in the CESM1.2 User's Guide.

Reporting a Problem

If you have any problems, please first read the User's Guide including the sections on FAQs and Use Cases. Please also refer to the CESM Bulletin Board, which is in place to facilitate communication within the CESM community. Finally, please also refer to the Release Notes entries that are provided with every release and release update.

CESM Support Policy

CESM Support Policy


CESM Data Management & Distribution Plan

The Community Earth System Model (CESM) Data Management and Data Distribution Plan documents the procedures for the storage and distribution of data associated with the CESM project.