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@skamaroc skamaroc commented Dec 4, 2025

This commit provides access to the hybrid vertical coordinate and the transition height of the coordinate through namelist variables for the init_atmosphere core. Additionally, the smoothing coefficient formula for the hybrid coordinate now uses the transition height instead of the model top height. These changes affect only the real-data construction of the vertical mesh. The changes include two new namelist configurations variables in the init_atmosphere Registry file: a logical for activating the hybrid vertical coordinate and the transition height for the coordinate (where it transitions from terrain-following to constant height). These variables are config_hybrid_coordinate (logical) and config_hybrid_top_z (real, meters). The variables had been hardwired in the code up until now (true and 30 km).

Also included are a few changes to provide further information concerning diagnostic output appearing in the init_atmosphere log files.

… transition

height of the coordinate through namelist variables for the init_atmosphere
core.  Additionally, the smoothing coefficient formula for the hybrid coordinate
now uses the transition height instead of the model top height. These changes
affect only the real-data construction of the vertical mesh.  The changes include
two new namelist configurations variables in the init_atmosphere Registry file:
a logical for activating the hybrid vertical coordinate and the transition height
for the coordinate (where it transitions from terrain-following to constant height).
These variables are config_hybrid_coordinate (logical) and config_hybrid_top_z
(real, meters). The variables had been hardwired in the code up until now
(true and 30 km).

Also included are a few changes to provide further information concerning
diagnostic output appearing in the init_atmosphere log files.
@skamaroc skamaroc requested a review from mgduda December 4, 2025 20:56
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