What is CESM ?#
CESM is a coupled Earth system model for simulating Earth’s climate system and connected component systems. The model is composed of separate models that simultaneously simulate the Earth’s atmosphere, ocean, land, river run-off, land-ice, and sea-ice. The model components that are coupled through the Common Infrastructure for Modeling the Earth known as CIME.
Figure: CESM2 Structure 
Model Components#
Each model component has a page on the CESM website containing descriptions and documentation for active or prognostic models.
You can explore each of the component models and CIME from the links below.
Component Links: