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Available derived quantities
As of Met.3D v1.7, the following derived variables are implemented (all input variable names follow the CF standard names):
| Info | ||
|---|---|---|
| ||
he variables in the following list support all grid and vertical level types unless otherwise noted. |
- Horizontal wind speed ("wind_speed")
- Requires eastward_wind, northward_wind
- 3D wind velocity ("magnitude_of_air_velocity")
- Requires eastward_wind, northward_wind, upward_air_velocity
- Potential temperature ("air_potential_temperature")
- Requires air_temperature
- Equivalent potential temperature ("equivalent_potential_temperature")
- Requires air_temperature, specific_humidity
- Computed using equation (43) of Bolton (MWR, 1980), "The Computation of Equivalent Potential Temperature".
- Relative humidity ("relative_humidity")
- Requires air_temperature, specific_humidity
- Computed using saturation vapour pressure by Huang (JAMC, 2018), "A Simple Accurate Formula for Calculating Saturation VaporPressure of Water and Ice", DOI: 10.1175/JAMC-D-17-0334.1
- Potential vorticity ("ertel_potential_vorticity")
Requires eastward_wind, northward_wind, air_temperature, surface_air_pressure
- NOTE: Only available for regular lon-lat grids defined on hybrid sigma-pressure levels (e.g. ECMWF, ERA-5)
- Computed using the ETH Lagranto formulation
- Geopotential height ("geopotential_height")
- Requires air_temperature, specific_humidity, surface_geopotential, surface_air_pressure, surface_temperature
- Geopotential height ("geopotential_height_from_geopotential")
- Requires geopotential
- Simply divides input by 9.81m^2/s^2
- Dew point temperature ("dew_point_temperature")
- Requires specific_humidity
- Hourly total precipitation ("lwe_thickness_of_precipitation_amount_Nh")
- Requires lwe_thickness_of_precipitation_amount
- Computes N-hourly precipitation from accumulated total precipitation (i.e., difference in the accumulated amount over N hours)
- Vertically integrated horizontal moisture flux ("magnitude_of_vertically_integrated_horizontal_transport_of_moisture")
- Requires surface_air_pressure, eastward_wind, northward_wind, specific_humidity
- Air pressure ("air_pressure")
- Requires air_temperature
- Reconstructs 3D pressure field from grid level specification
Source code links
Computation of derived variables is implemented in the "derivedvars" source code subdirectory:
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