# Atmosphere model configurations

The struct AtmosModel defines a specific subtype of a balance law (i.e. conservation equations) specific to atmospheric modeling. A complete description of a model is provided by the fields listed below. In this implementation of the AtmosModel we concern ourselves with the conservative form of the compressible equations of moist fluid motion given a set of initial, boundary and forcing(source) conditions.

First, we construct the atmospheric physics via AtmosPhysics:

physics = AtmosPhysics{FT}(;
param_set::AbstractParameterSet;
ref_state = HydrostaticState(DecayingTemperatureProfile{FT}(param_set),)
turbulence = SmagorinskyLilly{FT}(0.21),
hyperdiffusion = NoHyperDiffusion(),
moisture = EquilMoist(),
precipitation = NoPrecipitation(),
tracers = NoTracers(),
)

### LES Configuration (with defaults)

Default field values for the LES AtmosModel definition are included below. Users are directed to the model subcomponent pages to view the possible options for each subcomponent.

atmos = AtmosModel{FT}(
::Type{AtmosLESConfigType},
physics::AtmosPhysics;
orientation = FlatOrientation(),
source = (Gravity(), Coriolis(), GeostrophicForcing{FT}(7.62e-5, 0, 0)),
problem = AtmosBC(physics),
init_state_prognostic = nothing,
data_config = nothing,
)
Note

Most AtmosModel subcomponents are common to both LES / GCM configurations. Equation sets are written in vector-invariant form and solved in Cartesian coordinates. The component orientation determines whether the problem is solved in a box (LES) or a sphere (GCM))

### GCM Configuration (with defaults)

Default field values for the GCM AtmosModel definition are included below. Users are directed to the model subcomponent pages to view the possible options for each subcomponent.

    ::Type{AtmosGCMConfigType},
physics::AtmosPhysics;
source::S = (Gravity(), Coriolis()),
boundarycondition::BC = AtmosBC(physics),
init_state_prognostic::IS = nothing,
data_config::DC = nothing,