diff --git a/experiments/ClimaEarth/components/atmosphere/climaatmos.jl b/experiments/ClimaEarth/components/atmosphere/climaatmos.jl
index 9d806807fe..d1087ca9f7 100644
--- a/experiments/ClimaEarth/components/atmosphere/climaatmos.jl
+++ b/experiments/ClimaEarth/components/atmosphere/climaatmos.jl
@@ -171,41 +171,62 @@ moisture_flux(::Union{CA.EquilMoistModel, CA.NonEquilMoistModel}, integrator) =
 ρq_tot(::Union{CA.EquilMoistModel, CA.NonEquilMoistModel}, integrator) = integrator.u.c.ρq_tot
 
 # extensions required by the Interfacer
-Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:cos_zenith_angle}) = CC.Fields.array2field(
-    sim.integrator.p.radiation.rrtmgp_model.cos_zenith,
-    CC.Fields.level(axes(sim.integrator.u.c), 1),
-)
-Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:co2}) =
-    sim.integrator.p.radiation.rrtmgp_model.volume_mixing_ratio_co2[]
+function Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:cos_zenith_angle})
+    center_space = CC.Spaces.level(axes(sim.integrator.u.c), 1)
+    if hasradiation(atmos_sim.integrator)
+        return CC.Fields.array2field(sim.integrator.p.radiation.rrtmgp_model.cos_zenith, center_space)
+    else
+        return fill(one(eltype(sim.integrator.u)), center_space)
+    end
+end
+function Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:co2})
+    if hasradiation(atmos_sim.integrator)
+        return sim.integrator.p.radiation.rrtmgp_model.volume_mixing_ratio_co2[]
+    else
+        return zero(eltype(sim.integrator.u))
+    end
+end
 function Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:diffuse_fraction})
-    radiation_model = sim.integrator.p.radiation.rrtmgp_model
-    # only take the first level
-    total_flux_dn = radiation_model.face_sw_flux_dn[1, :]
     face_space = CC.Spaces.level(axes(sim.integrator.u.f), CC.Utilities.half)
-    if radiation_model.radiation_mode isa CA.RRTMGPInterface.GrayRadiation
-        diffuse_fractions = zero(total_flux_dn)
+    if hasradiation(atmos_sim.integrator)
+        radiation_model = sim.integrator.p.radiation.rrtmgp_model
+        # only take the first level
+        total_flux_dn = radiation_model.face_sw_flux_dn[1, :]
+        if radiation_model.radiation_mode isa CA.RRTMGPInterface.GrayRadiation
+            diffuse_fractions = zero(total_flux_dn)
+        else
+            direct_flux_dn = radiation_model.face_sw_direct_flux_dn[1, :]
+            FT = eltype(total_flux_dn)
+            diffuse_fractions =
+                clamp.((total_flux_dn .- direct_flux_dn) ./ (max.(total_flux_dn, eps(FT))), zero(FT), one(FT))
+        end
+        return CC.Fields.array2field(diffuse_fractions, face_space)
     else
-        direct_flux_dn = radiation_model.face_sw_direct_flux_dn[1, :]
-        FT = eltype(total_flux_dn)
-        diffuse_fractions =
-            clamp.((total_flux_dn .- direct_flux_dn) ./ (max.(total_flux_dn, eps(FT))), zero(FT), one(FT))
+        return fill(zero(eltype(sim.integrator.u)), face_space)
     end
-    return CC.Fields.array2field(diffuse_fractions, face_space)
 end
 Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:liquid_precipitation}) =
     surface_rain_flux(sim.integrator.p.atmos.moisture_model, sim.integrator)
-Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:LW_d}) = CC.Fields.level(
-    CC.Fields.array2field(sim.integrator.p.radiation.rrtmgp_model.face_lw_flux_dn, axes(sim.integrator.u.f)),
-    CC.Utilities.half,
-)
+function Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:LW_d})
+    face_space = CC.Spaces.level(axes(sim.integrator.u.f), CC.Utilities.half)
+    if hasradiation(atmos_sim.integrator)
+        return CC.Fields.array2field(sim.integrator.p.radiation.rrtmgp_model.face_lw_flux_dn[1, :], face_space)
+    else
+        return fill(zero(eltype(sim.integrator.u)), face_space)
+    end
+end
 Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:radiative_energy_flux_sfc}) =
     surface_radiation_flux(sim.integrator.p.atmos.radiation_mode, sim.integrator)
 Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:snow_precipitation}) =
     surface_snow_flux(sim.integrator.p.atmos.moisture_model, sim.integrator)
-Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:SW_d}) = CC.Fields.level(
-    CC.Fields.array2field(sim.integrator.p.radiation.rrtmgp_model.face_sw_flux_dn, axes(sim.integrator.u.f)),
-    CC.Utilities.half,
-)
+function Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:SW_d})
+    face_space = CC.Spaces.level(axes(sim.integrator.u.f), CC.Utilities.half)
+    if hasradiation(atmos_sim.integrator)
+        return CC.Fields.array2field(sim.integrator.p.radiation.rrtmgp_model.face_sw_flux_dn[1, :], face_space)
+    else
+        return fill(zero(eltype(sim.integrator.u)), face_space)
+    end
+end
 Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:turbulent_energy_flux}) =
     CC.Geometry.WVector.(sim.integrator.p.precomputed.sfc_conditions.ρ_flux_h_tot)
 Interfacer.get_field(sim::ClimaAtmosSimulation, ::Val{:turbulent_moisture_flux}) =