Added flexibility on soil layer definitions in MPAS#33
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…o run with more than four soil layers. The logic in mpas_atmphys_driver_lsm_noahmp.F can be simplified to a single loop that will always work. Likewise, Registry_noahmp.xml does not need to have the combined number of soil plus snow levels (nzSoilLevels) hardcoded, it can be written as the sum of the levels so it always works.
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Pull Request Description
The original MPAS and MONAN codes impose soils to have 2-m depth and 4 layers (10, 30, 60 and 100 cm). These are rather shallow soils for many of the tropical forest biomes, where trees are known to have rooting depths of 10 m or more.
This code defines a new namelist block (soil_grid) for soil initialisation in
namelist.init_atmosphere, and two variables that control how the thickness of each soil layer varies with depth.config_dzstop. The thickness of the top most soil layer (ΔzTop)config_kzs. An exponential factor that makes deeper soil layers thicker in a monotonic and predictable way (κ).The soil thickness of layer n (Δzn) is defined as:
Δzn = ΔzTop exp[ κ ( n - 1 ) ]
With these changes, the total number of soil layers (
config_nsoillevels) no longer needs to be 4. One potential downside of this pull request is that the default soil layers will be slightly different from the default. If this turns out to be a problem, I can make some special case (e.g.,kzs=0.) to create the previous layers.This pull request needs tests, so I am leaving it as a draft for the time being. I will update it to ready for review once this is more extensively tested.
Type of Change
Testing and Quality
Scientific Impact
Soils in many regions (notably across tropical moist forests) can be markedly deeper than the default of 2.0 m. By allowing roots to reach deeper soils (e.g., in the Amazon rooting depth often can be as deep as 10 metres), this change may allow better representation of seasonal cycles of sensible heat flux and evapotranspiration.