The Community Climate System Model (CCSM) is a computer model for simulating the
Earth’s climate. The CCSM is built from four individual component models
for the atmosphere, ocean, land surface, and sea ice. The notion of a
physical/dynamical component of the climate system translates directly to the
software component structure. Software design of the CCSM is focused on the goals of
modularity, extensibility, and performance portability. These goals are met at both
the component level and within the individual component models. Performance
portability is the ability of a code to achieve good performance across a variety of
computer architectures while maintaining a single source code. As a community model,
the CCSM must run on a variety of machine architectures and must perform well on all
these architectures for computationally intensive climate simulations.
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