Add update_field for emissivity in AtmosModelSim

Add emissivity to update_field in the Interfacer,
and add a method definition for it in climaatmos.jl
All 16 bands are set to the same values.

experiments/ClimaEarth/components/atmosphere/climaatmos.jl

@@ -232,10 +232,15 @@ function Interfacer.update_field!(atmos_sim::ClimaAtmosSimulation, ::Val{:co2},
         @warn("Gray radiation model initialized, skipping CO2 update", maxlog = 1)
         return
     else
-        atmos_sim.integrator.p.radiation.rrtmgp_model.volume_mixing_ratio_co2 .= Statistics.mean(parent(field))
+        atmos_sim.integrator.p.radiation.rrtmgp_model.surface_emissivity .= Statistics.mean(parent(field))
     end
 end
 # extensions required by the Interfacer
+function Interfacer.update_field!(sim::ClimaAtmosSimulation, ::Val{:emissivity}, field)
+    # sets all 16 bands (rows) to the same values
+    sim.integrator.p.radiation.rrtmgp_model.direct_sw_surface_albedo .=
+        reshape(CC.Fields.field2array(field), 1, length(parent(field)))
+end
 function Interfacer.update_field!(sim::ClimaAtmosSimulation, ::Val{:surface_direct_albedo}, field)
     sim.integrator.p.radiation.rrtmgp_model.direct_sw_surface_albedo .=
         reshape(CC.Fields.field2array(field), 1, length(parent(field)))

src/Interfacer.jl

@@ -179,6 +179,7 @@ update_field!(
     sim::AtmosModelSimulation,
     val::Union{
         Val{:co2},
+        Val{:emissivity},
         Val{:surface_direct_albedo},
         Val{:surface_diffuse_albedo},
         Val{:surface_temperature},