MPAS not initializing reference pressures in the same way as other dycores

[PeterHjortLauritzen]

What happened?

Problem identified by @cjablono!

MPAS is not setting reference pressures in physics/cam/ref_pres.F90

real(r8), protected :: pref_edge(pverp)     ! Layer edges
real(r8), protected :: pref_mid(pver)       ! Layer midpoints
real(r8), protected :: pref_mid_norm(pver)  ! Layer midpoints normalized by
                                                                         ! surface pressure ('eta' coordinate)

real(r8), protected :: psurf_ref            ! reference pressure

in the same way as other dycores. Other dycores use 1000hPa for the reference surface pressure whereas MPAS is using 1013.25hPa (coming from calling std_atm_profile from dynamics/mpas/dyn_grid.F90) .

These reference pressures are used throughout physics.

What are the steps to reproduce the bug?

N/A

What CAM tag were you using?

N/A

What machine were you running CAM on?

CISL machine (e.g. cheyenne)

What compiler were you using?

Intel

Path to a case directory, if applicable

No response

Will you be addressing this bug yourself?

Yes

Extra info

No response