Potential TemperatureΒΆ

Performs a variable conversion from temperature and pressure to potential temperature.

Transform: PotentialTFromT

obs filters:
- filter: Variables Transform
Transform: PotentialTFromT

Observation parameters needed (JEDI name)

  • airTemperature (\(T\))

  • pressure (\(P\))

The potential temperature (\(\theta\)) is calculated as follows:

\[\theta = (P_{F}/P)^\kappa \times T\]

where

\[\kappa = R_d / C_p\]

and \(P_{F}\) is the reference surface pressure.

Note: the error on \(\theta\) is set to the error on \(T\) scaled by the conversion factor \((P_{F}/P)^\kappa\).

Filter optional parameters

This filter allows the user to set specified names for input and output variables (defaults are IODA naming conventions):

  • pressure variable (default: pressure)

  • temperature variable (default: airTemperature)

  • potential temperature variable (default: potentialTemperature)