Physics (PBL-SATMEDF) Update for Explicit Subcanopy Effects on Chemical Tracers

[drnimbusrain]

Description

Updates the current integrated subcanopy effect (previously merged PR #928 ) to use a more robust, explicit, 3-layer subcanopy effect on chemical tracers (ONLY) in the PBL-SATMEDMF scheme. The vegetative canopy modulates vertical diffusion. We split the diffusion on 3 sub-canopy layers with variable height located at 1, 0.5 and 0.2 canopy height (based on Makar et al. 2017), while ensuring mass conservation before returning to the original model layers (for advection, deposition, other physical processes). This leads to a more pronounced effect on the transport of chemical tracers, particularly those as precursors to near-surface ozone formation in the UFS-AQM configuration.

Solution

Updating ccpp-physics PBL-SATMEDF in PR: ufs-community/ccpp-physics#350

Testing:

1. Have you tested the code changes? On what platforms?
   RDHPCs Gaea C6
2. Have you run regression test in ufs-weather-model or ufs-s2s-model with code changes?
   No.

Dependent PRs:

ufs-community/ccpp-physics#350

Directly reference any issues or PRs in this or other repositories that this is related to, and describe how they are related. Example:
ufs-community/ccpp-physics#350