store z etc in domain

docs/src/APIs/shared_utilities.md

@@ -19,6 +19,7 @@ ClimaLand.Domains.obtain_face_space
 ClimaLand.Domains.obtain_surface_space
 ClimaLand.Domains.obtain_surface_domain
 ClimaLand.Domains.top_center_to_surface
+ClimaLand.Domains.top_face_to_surface
 ClimaLand.Domains.linear_interpolation_to_surface!
 ClimaLand.Domains.get_Δz
 

docs/tutorials/standalone/Soil/freezing_front.jl

@@ -122,7 +122,6 @@ params = Soil.EnergyHydrologyParameters(
 zmax = FT(0)
 zmin = FT(-0.2)
 nelems = 20
-Δz = FT(0.01)
 soil_domain = Column(; zlim = (zmin, zmax), nelements = nelems);
 
 # Set the boundary conditions:
@@ -155,7 +154,7 @@ boundary_fluxes = (;
 # Sources are added as elements of a list of sources. Here we just add freezing
 # and thawing.
 
-sources = (PhaseChange{FT}(Δz),);
+sources = (PhaseChange{FT}(),);
 
 # Now we can package this up in the
 # [`EnergyHydrology`](@ref ClimaLand.Soil.EnergyHydrology) model

docs/tutorials/standalone/Soil/sublimation.jl

@@ -118,9 +118,8 @@ zmin = FT(-0.35)
 nelems = 12
 soil_domain = Column(; zlim = (zmin, zmax), nelements = nelems);
 z = ClimaCore.Fields.coordinate_field(soil_domain.space.subsurface).z;
-Δz = parent(z)[end]
 # Soil model, and create the prognostic vector Y and cache p:
-sources = (PhaseChange{FT}(Δz),);
+sources = (PhaseChange{FT}(),);
 soil = Soil.EnergyHydrology{FT}(;
     parameters = params,
     domain = soil_domain,

experiments/standalone/Biogeochemistry/experiment.jl

@@ -46,7 +46,6 @@ for (FT, tf) in ((Float32, 2 * dt), (Float64, tf))
     zmax = FT(0)
     zmin = FT(-1)
     nelems = 20
-    Δz = abs(zmax - zmin) / nelems
 
     lsm_domain = Column(; zlim = (zmin, zmax), nelements = nelems)
 
@@ -57,7 +56,7 @@ for (FT, tf) in ((Float32, 2 * dt), (Float64, tf))
     bot_flux_bc_h = Soil.HeatFluxBC((p, t) -> 0.0)
 
 
-    sources = (PhaseChange{FT}(Δz),)
+    sources = (PhaseChange{FT}(),)
     boundary_fluxes = (;
         top = WaterHeatBC(; water = top_flux_bc_w, heat = bot_flux_bc_h),
         bottom = WaterHeatBC(; water = bot_flux_bc_w, heat = bot_flux_bc_h),

src/integrated/soil_canopy_model.jl

@@ -91,12 +91,7 @@ function SoilCanopyModel{FT}(;
     # These may be passed in, or set, depending on use scenario.
     (; atmos, radiation) = land_args
     # These should always be set by the constructor.
-    Δz = minimum(
-        ClimaCore.Fields.Δz_field(
-            ClimaLand.coordinates(soil_args.domain).subsurface,
-        ),
-    )
-    sources = (RootExtraction{FT}(), Soil.PhaseChange{FT}(Δz))
+    sources = (RootExtraction{FT}(), Soil.PhaseChange{FT}())
     # add heat BC
     top_bc =
         ClimaLand.Soil.AtmosDrivenFluxBC(atmos, CanopyRadiativeFluxes{FT}())

src/shared_utilities/Domains.jl

@@ -107,6 +107,8 @@ struct Column{FT} <: AbstractDomain{FT}
     boundary_names::Tuple{Symbol, Symbol}
     "A NamedTuple of associated ClimaCore spaces: in this case, the surface space and subsurface center space"
     space::NamedTuple
+    "Fields associated with the coordinates of the domain that are useful to store"
+    fields::NamedTuple
 end
 
 """
@@ -159,9 +161,18 @@ function Column(;
     subsurface_space = ClimaCore.Spaces.CenterFiniteDifferenceSpace(mesh)
     surface_space = obtain_surface_space(subsurface_space)
     space = (; surface = surface_space, subsurface = subsurface_space)
-    return Column{FT}(zlim, (nelements,), dz_tuple, boundary_names, space)
+    fields = get_additional_domain_fields(subsurface_space)
+    return Column{FT}(
+        zlim,
+        (nelements,),
+        dz_tuple,
+        boundary_names,
+        space,
+        fields,
+    )
 end
 
+
 """
     Plane{FT} <: AbstractDomain{FT}
 A struct holding the necessary information
@@ -275,6 +286,8 @@ struct HybridBox{FT} <: AbstractDomain{FT}
     periodic::Tuple{Bool, Bool}
     "A NamedTuple of associated ClimaCore spaces: in this case, the surface space and subsurface center space"
     space::NamedTuple
+    "Fields associated with the coordinates of the domain that are useful to store"
+    fields::NamedTuple
 end
 
 """
@@ -357,6 +370,7 @@ function HybridBox(;
 
     surface_space = obtain_surface_space(subsurface_space)
     space = (; surface = surface_space, subsurface = subsurface_space)
+    fields = get_additional_domain_fields(subsurface_space)
     return HybridBox{FT}(
         xlim,
         ylim,
@@ -366,6 +380,7 @@ function HybridBox(;
         npolynomial,
         periodic,
         space,
+        fields,
     )
 end
 
@@ -401,6 +416,8 @@ struct SphericalShell{FT} <: AbstractDomain{FT}
     npolynomial::Int
     "A NamedTuple of associated ClimaCore spaces: in this case, the surface space and subsurface center space"
     space::NamedTuple
+    "Fields associated with the coordinates of the domain that are useful to store"
+    fields::NamedTuple
 end
 
 """
@@ -465,13 +482,15 @@ function SphericalShell(;
     )
     surface_space = obtain_surface_space(subsurface_space)
     space = (; surface = surface_space, subsurface = subsurface_space)
+    fields = get_additional_domain_fields(subsurface_space)
     return SphericalShell{FT}(
         radius,
         depth,
         dz_tuple,
         nelements,
         npolynomial,
         space,
+        fields,
     )
 end
 
@@ -677,15 +696,15 @@ When `val` is a scalar (e.g. a single float or struct), returns `val`.
 top_center_to_surface(val) = val
 
 """
-    linear_interpolation_to_surface!(sfc_field, center_field, z)
+    linear_interpolation_to_surface!(sfc_field, center_field, z, Δz_top)
 
 Linearly interpolate the center field `center_field` to the surface
-defined by the top face coordinate of `z`; updates the `sfc_field`
+defined by the top face coordinate of `z` with a center to face distance
+`Δz_top` in the first layer; updates the `sfc_field`
 on the surface (face) space in place.
 """
-function linear_interpolation_to_surface!(sfc_field, center_field, z)
-    Δz_top, _ = get_Δz(z)
-    surface_space = obtain_surface_space(axes(z))
+function linear_interpolation_to_surface!(sfc_field, center_field, z, Δz_top)
+    surface_space = axes(sfc_field)
     Δz_top = ClimaCore.Fields.field_values(Δz_top)
     nz = Spaces.nlevels(axes(center_field))
     f1 = ClimaCore.Fields.field_values(ClimaCore.Fields.level(center_field, nz))
@@ -694,10 +713,8 @@ function linear_interpolation_to_surface!(sfc_field, center_field, z)
     )
     z1 = ClimaCore.Fields.field_values(ClimaCore.Fields.level(z, nz))
     z2 = ClimaCore.Fields.field_values(ClimaCore.Fields.level(z, nz - 1))
-    sfc_field .= ClimaCore.Fields.Field(
-        (@. (f1 - f2) / (z1 - z2) * (Δz_top + z1 - z2) + f2),
-        surface_space,
-    )
+    ClimaCore.Fields.field_values(sfc_field) .=
+        @. (f1 - f2) / (z1 - z2) * (Δz_top + z1 - z2) + f2
 end
 
 """
@@ -721,12 +738,61 @@ function get_Δz(z::ClimaCore.Fields.Field)
     return Δz_top ./ 2, Δz_bottom ./ 2
 end
 
+"""
+    top_face_to_surface(face_field::ClimaCore.Fields.Field, surface_space)
+
+Creates and returns a ClimaCore.Fields.Field defined on the space
+corresponding to the surface of the space on which `face_field`
+is defined, with values equal to the those at the level of the top
+face.
+
+Given a `face_field` defined on a 3D
+extruded face finite difference space, this would return a 2D field
+corresponding to the surface, with values equal to the topmost level.
+ """
+function top_face_to_surface(face_field::ClimaCore.Fields.Field, surface_space)
+    face_space = axes(face_field)
+    N = ClimaCore.Spaces.nlevels(face_space)
+    sfc_level =
+        ClimaCore.Fields.level(face_field, ClimaCore.Utilities.PlusHalf(N - 1))
+    # Project onto surface space
+    return ClimaCore.Fields.Field(
+        ClimaCore.Fields.field_values(sfc_level),
+        surface_space,
+    )
+end
+
+"""
+    get_additional_domain_fields(subsurface_space)
+
+A helper function which returns additional fields corresponding to ClimaLand
+domains which have a subsurface_space (Column, HybridBox, SphericalShell);
+these fields are the center coordinates of the subsurface space, the spacing between
+the top center and top surface and bottom center and bottom surface, as well as the
+field corresponding to the surface height z.
+
+We allocate these once, upon domain construction, so that they are accessible
+during the simulation.
+"""
+function get_additional_domain_fields(subsurface_space)
+    surface_space = obtain_surface_space(subsurface_space)
+    z = ClimaCore.Fields.coordinate_field(subsurface_space).z
+    Δz_top, Δz_bottom = get_Δz(z)
+    face_space = obtain_face_space(subsurface_space)
+    z_face = ClimaCore.Fields.coordinate_field(face_space).z
+    z_sfc = top_face_to_surface(z_face, surface_space)
+    fields = (; z = z, Δz_top = Δz_top, Δz_bottom = Δz_bottom, z_sfc = z_sfc)
+    return fields
+end
+
+
 export AbstractDomain
 export Column, Plane, HybridBox, Point, SphericalShell, SphericalSurface
 export coordinates,
     obtain_face_space,
     obtain_surface_space,
     top_center_to_surface,
+    top_face_to_surface,
     obtain_surface_domain,
     linear_interpolation_to_surface!,
     get_Δz

src/standalone/Soil/Biogeochemistry/Biogeochemistry.jl

@@ -171,8 +171,8 @@ ClimaLand.auxiliary_domain_names(model::SoilCO2Model) = (
 
 function make_update_boundary_fluxes(model::SoilCO2Model)
     function update_boundary_fluxes!(p, Y, t)
-        z = ClimaCore.Fields.coordinate_field(model.domain.space.subsurface).z
-        Δz_top, Δz_bottom = ClimaLand.Domains.get_Δz(z)
+        Δz_top = model.domain.fields.Δz_top
+        Δz_bottom = model.domain.fields.Δz_bottom
         p.soilco2.top_bc .= boundary_flux(
             model.boundary_conditions.top,
             TopBoundary(),
@@ -405,7 +405,7 @@ function ClimaLand.make_update_aux(model::SoilCO2Model)
         # get FT to enforce types of variables not stored directly in `p`
         FT = eltype(Y.soilco2.C)
         params = model.parameters
-        z = ClimaCore.Fields.coordinate_field(model.domain.space.subsurface).z
+        z = model.domain.fields.z
         T_soil = FT.(soil_temperature(model.driver.met, p, Y, t, z))
         θ_l = FT.(soil_moisture(model.driver.met, p, Y, t, z))
         Csom = FT.(soil_SOM_C(model.driver.soc, p, Y, t, z))