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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CESM2

Community Earth System Model 2 (CESM2)

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

Featured CESM News

Community Earth System Model
Sep 25, 2024

Community Earth System Model 3 (CESM3): Plans, progress, timelines

Information on the science and infrastructure updates and timelines planned for the forthcoming CESM3 release.

CESM2
Jul 18, 2024

CESM Newsletter Signup

CESM_workshop_photo_9
Jun 10, 2024

2024 CESM Workshop Awards

NSF_NCAR
Feb 27, 2024

CESM mailing list updates

Upcoming Events

Polar Climate

Meeting
Land Ice Working Group Meeting 2025

Jan. 28, 2025
NSF National Center for Atmospheric Research, Boulder, CO
Registration / Call for Talks
Paleoclimate Model

Meeting
Paleoclimate Working Group Meeting 2025

Jan. 29, 2025
NSF National Center for Atmospheric Research, Boulder, CO
Registration / Call for Talks
Software Engineering Working Group

Meeting
Software Engineering Working Group Meeting 2025

Jan. 30, 2025
NSF National Center for Atmospheric Research, Boulder, CO
Registration
Atmosphere model working group

Meeting
Atmosphere Model, Chemistry Climate, Earth System Prediction, Climate Variability & Change, and Whole Atmosphere Working Group Meeting 2025

Feb. 3 to Feb. 6, 2025
NSF National Center for Atmospheric Research, Boulder, CO
Registration / Call for Talks
View all events

What We Offer

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

CESM2 press release

Models

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

CESM Workshop

Our Events

Information about our workshops, tutorials, and working group meetings

AMWG Diagnostics

Experiments

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

CAM

Projects

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

Earth System Prediction Working Group

Community Projects

CESM projects in collaboration with community members

Publications

Publications

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).

Community Earth System Model

Background

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

Support policy

Support Policy

View the policies regarding to support of CESM and other details

CESM Administration

CESM Administration

Learn more about the CESM management, administration, and governance

CESM Awards

Awards

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

Fog

Frequently Asked Questions

View a list of our frequently asked questions

NCAR Mesa Lab

Contact Us

View how to contact us and the contact information for staff