The System for Integrated Modeling of the Atmosphere (SIMA) is a unified community atmospheric modeling framework, for use in an Earth System Model, such as the Community Earth System Model (CESM). The current incarnation of SIMA enables diverse configurations of the atmosphere model inside of CESM, for applications spanning minutes to centuries and cloud to global scales, including atmospheric forecasts and projections of the atmospheric state and composition from the surface into the thermosphere.

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