earthkit.meteo.vertical.array.relative_geopotential_thickness

earthkit.meteo.vertical.array.relative_geopotential_thickness(alpha, delta, t, q)

Calculate the geopotential thickness with respect to the surface on model full-levels.

Parameters:

alpha (array-like) – Alpha term of pressure calculations
delta (array-like) – Delta term of pressure calculations
t (array-like) – Temperature on model full-levels (K). First dimension must correspond to the model full-levels.
q (array-like) – Specific humidity on model full-levels (kg/kg). First dimension must correspond to the model full-levels.

Returns:

geopotential thickness of model full-levels with respect to the surface

Return type:

array-like

Notes

t and q must contain the same model levels in ascending order with respect to the model level number. The model level range must be contiguous and must include the bottom-most level, but not all the levels must be present. E.g. if the vertical coordinate system has 137 model levels using only a subset of levels between e.g. 137-96 is allowed.

alpha and delta must be defined on the same levels as t and q. These values can be calculated using pressure_at_model_levels().

The computations are described in [IFS-CY47R3-Dynamics] (page 7-8).