initial ClimaSeaIce infrastructure changes

Author: juliasloan25

experiments/ClimaEarth/components/ocean/prescr_seaice.jl

@@ -171,6 +171,8 @@ Interfacer.get_field(sim::PrescribedIceSimulation, ::Val{:ice_concentration}) =
     sim.integrator.p.area_fraction
 Interfacer.get_field(sim::PrescribedIceSimulation, ::Val{:emissivity}) =
     sim.integrator.p.params.ϵ
+Interfacer.get_field(sim::PrescribedIceSimulation, ::Val{:ice_concentration}) =
+    sim.integrator.p.area_fraction
 Interfacer.get_field(sim::PrescribedIceSimulation, ::Val{:roughness_buoyancy}) =
     sim.integrator.p.params.z0b
 Interfacer.get_field(sim::PrescribedIceSimulation, ::Val{:roughness_momentum}) =