From a user perspective, the &physics namelist record contains a new option, physics_suite, which is a character string 
    naming the physics suite to be used in a simulation. By default, namelist options for selecting individual physics 
    schemes (specifically, mp_physics, cu_physics, ra_lw_physics, ra_sw_physics, bl_pbl_physics, sf_sfclay_physics, and  
    sf_surface_physics) do not appear in the namelist. However, the selection of any of the aforementioned schemes may 
    be overridden by specifying that namelist option explicitly.

    At runtime, the model prints to the rsl files a summary of the physics schemes that will be used in the simulation:

    *************************************
    Configuring physics suite 'tropical'

             mp_physics:      6      6
             cu_physics:     16     16
          ra_lw_physics:      4      4
          ra_sw_physics:      4      4
         bl_pbl_physics:      1      1
      sf_sfclay_physics:     91     91
     sf_surface_physics:      2      2
    *************************************

    In the printout, if any options were overridden by the user, those options will be printed with a trailing asterisk.

    Only a single physics suite is specified for a simulation; all nests are assumed to use the same physics options unless 
    the user specifically overrides these options for a nested domain. For example, to override the cumulus scheme in 
    domain 3, one might write:

     &physics
     physics_suite                       = 'tropical'
     cu_physics                          = -1,    -1,     0,
     ...

    which results in the following printout to the rsl.error.0000 file:

    *************************************
    Configuring physics suite 'tropical'

             mp_physics:      6      6      6
             cu_physics:     16     16      0*
          ra_lw_physics:      4      4      4
          ra_sw_physics:      4      4      4
         bl_pbl_physics:      1      1      1
      sf_sfclay_physics:     91     91     91
     sf_surface_physics:      2      2      2

    (* = option overrides suite setting)
    *************************************

    A value of -1 was chosen to indicate "the scheme following the choice of physics suite" for the namelist options 
    mp_physics, cu_physics, ra_lw_physics, ra_sw_physics, etc., since a value of 0 is already used to indicate 
    no parameterization.