Reference / Input deck / solver / equations / base state

base state

Hydrostatic base state for a stratified (anelastic) atmosphere. Its presence turns stratification on: density becomes the base-state rho(z) and buoyancy is g (theta - theta_base)/theta_base. Needs a non-zero gravity

reference kindrequired lapse rate brunt vaisala frequency mixed layer depth upper lapse ratesurface temperatureadvanced surface pressureadvanced

reference

str·not set by default

Reference condition supplying the surface temperature and pressure (e.g. 'IC_1'); defaults to the initialisation reference

surface temperatureadvanced

float·not set by default·> 0.0 K

Temperature at the reference location; overrides the reference condition's value

Used inatmosphere

surface pressureadvanced

float·not set by default·> 0.0 Pa

Pressure at the reference location; overrides the reference condition's value

Used inatmosphere

kindrequired

required

Uniform temperature; theta grows as exp(g z / (cp T0))

Options

Value	What it does	When to use it
isothermal	Uniform temperature $T_0$ , so potential temperature grows with height as $\theta = \theta_0 \exp(g z / (c_p T_0))$ .
constant lapse rate	Temperature falls linearly with height, $T = T_0 - \Gamma z$ , with $\Gamma$ set by `lapse_rate`.
constant brunt vaisala	Uniform stratification $\theta = \theta_0 \exp(N^2 z / g)$ .
two layer	A neutral mixed layer of uniform $\theta_0$ up to `mixed_layer_depth`, capped by stable stratification in which $\theta$ rises at `upper_lapse_rate`.	The GABLS1 stable boundary layer set-up.

Used inatmosphere

lapse rateconstant lapse rate only

float·default 0.0065·in K/m

-dT/dz; g/cp (about 0.0098) is the neutral dry adiabat

Used inatmosphere

brunt vaisala frequencyconstant brunt vaisala only

float·default 0.01·>= 0.0 1/s

Used inatmosphere

mixed layer depthtwo layer only

float·default 100·> 0.0 m

Depth h of the neutral mixed layer

Used inatmosphere

upper lapse ratetwo layer only

float·default 0.01·>= 0.0 K/m

dtheta/dz above the mixed layer

Used inatmosphere