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 hybrid (IFS model) full-levels.

Deprecated in version 1.0.0 See relative_geopotential_thickness() is deprecated for details.

Parameters:

• alpha (array-like) – Alpha term of pressure calculations

• delta (array-like) – Delta term of pressure calculations

• t (array-like) – Temperature on hybrid (IFS model) full-levels (K). First dimension must correspond to the full-levels.

• q (Specific humidity on hybrid (IFS model) full-levels (kg/kg). First dimension must) – correspond to the full-levels.

Returns:

Geopotential thickness (m2/s2) of hybrid (IFS model) full-levels with respect to the surface

Return type:

array-like

See also

pressure_at_model_levels

Notes

t and q must contain the same levels in ascending order with respect to the 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-CY49R1-Dynamics] Chapter 2, Section 2.2.1.