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There are two options for nudging available in CESM, generally referred to as 'specified dynamics' and 'physics-side nudging'.  To use physics-side nudging in your simulation, see the CAM User's Guide, Section 8.46.  All configuration is set in the namelist (user_nl_cam), and numerous options are available.  CESM2.2 has a compset, FCnudged, with a standard configuration (except, it is recommended to use  model_times_per_day = 48, instead of the default  model_times_per_day = 24).