Community Earth System Model

The Community Earth System Model is a fully coupled global climate model developed in collaboration with colleagues in the research community. CESM provides state of the art computer simulations of Earth's past, present, and future climate states.

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Community Earth System Model 2 (CESM2)

The latest release in the CESM family including many substantial science and infrastructure improvements since its previous version

What We Offer

Fully coupled numerical simulations of the Earth system consisting of atmospheric, ocean, ice, land surface, carbon cycle, and other components


View the current and past releases for all of the models we offer

Our Events

Information about our workshops, tutorials, and working group meetings


Experiments and resulting output data for various CCSM & CESM model release versions


Staff led CESM projects and diagnostics packages for the Community Earth System Model

Community Projects

CESM projects in collaboration with community members


A list of publications that used CESM in their research as well as how to acknowledge CESM if used in your publications

Who We Are

The CESM project is supported primarily by the National Science Foundation (NSF). Administration of the CESM is maintained by the Climate and Global Dynamics Laboratory (CGD) at the National Center for Atmospheric Research (NCAR).


Learn about the background & history of CESM from when it was created in 1983

Support Policy

View the policies regarding to support of CESM and other details

CESM Administration

Learn more about the CESM management, administration, and governance


View past winners of CESM Distinguished Achievement Awards & CESM Graduate Student Awards

Frequently Asked Questions

View a list of our frequently asked questions

Contact Us

View how to contact us and the contact information for staff