Derived model parameters — cdo

This module contains operators that calculate derived model parameters. These are currently the parameters sea level pressure and geopotential height. All necessary input variables are identified by their GRIB1 code number or the NetCDF CF standard name. Supported GRIB1 parameter tables are: WMO standard table number 2 and ECMWF local table number 128. CF standard name & Units & GRIB 1 code surface_air_pressure & Pa & 134 air_temperature & K & 130 specific_humidity & kg/kg & 133 surface_geopotential & m2 s-2 & 129 geopotential_height & m & 156

Usage

cdo_gheight(ifile, ofile = NULL)

cdo_gheight_half(ifile, ofile = NULL)

cdo_sealevelpressure(ifile, ofile = NULL)

Arguments

ifile: String with the path to the input file.
ofile: String with the path to the output file.

Details

sealevelpressure  Sea level pressure
                  This operator computes the sea level pressure (air_pressure_at_sea_level). Required input fields
                  are surface_air_pressure, surface_geopotential and air_temperature on full hybrid sigma pressure levels.
gheight           Geopotential height on full-levels
                  This operator computes the geopotential height (geopotential_height) on model full-levels in metres.
                  Required input fields are surface_air_pressure, surface_geopotential, specific_humidity and air_temperature
                  on full hybrid sigma pressure levels. Note, this procedure is an approximation, which doesn't take into
                  account the effects of e.g. cloud ice and water, rain and snow.
gheight_half      Geopotential height on half-levels
                  This operator computes the geopotential height (geopotential_height) on model half-levels in metres.
                  Required input fields are surface_air_pressure, surface_geopotential, specific_humidity and air_temperature
                  on full hybrid sigma pressure levels. Note, this procedure is an approximation, which doesn't take into
                  account the effects of e.g. cloud ice and water, rain and snow.