Fieldextra returns the parameter etadot for the omega_slope operator but we return w (Vertical Velocity (Pressure)). Because according to Fieldextra's description:
Convert from ECMWF etadot (i.e. deta/dt) to etadot*dp/deta
we infer that the returned parameter aligns with the COSMO definition of omega as Vertical Velocity (Pressure) (omega=dp/dt). In ECMWF, this vertical velocity is associated with the parameter w.
Additionally, Flexpart expects the GRIB code for "etadot" but converts the ID for "etadot" (ID: 77) to vertical velocity "w" (ID: 135), as shown in these code snippets: link and link.
Purpose
Update metadata of
omega_slopeoperator.Note
Fieldextra returns the parameter
etadotfor theomega_slopeoperator but we return w (Vertical Velocity (Pressure)). Because according to Fieldextra's description: Convert from ECMWF etadot (i.e. deta/dt) to etadot*dp/detawe infer that the returned parameter aligns with the COSMO definition of omega as Vertical Velocity (Pressure) (omega=dp/dt). In ECMWF, this vertical velocity is associated with the parameter w.
Additionally, Flexpart expects the GRIB code for "etadot" but converts the ID for "etadot" (ID: 77) to vertical velocity "w" (ID: 135), as shown in these code snippets: link and link.