CDFVIDAR – Process Lat/Lon Input to Cubic
Cdfvidar is used to convert GCM, reanalyses, analyses or other weather and climate data into initial conditions or mesonest host files for nudging with the conformal cubic format. Input files are usually formatted as described in the table below. Typically the input files are on pressure levels (hPa) or sigma-pressure levels.
| Name | Units | Dimension | cdfvidar name in input netcdf file |
|---|---|---|---|
| Geopotential height (optional) | m | 3D | hgt, z or geop_ht |
| Air temperature | K | 3D | temp, ta or air_temp |
| U-component of wind | m/s | 3D | u, ua or zonal_wnd |
| V-component of wind | m/s | 3D | v, va or merid_wnd |
| Relative humidity | % or fraction | 3D | rh or relhum |
|
Water vapour mixing ratio (as an alternative to relative humidity) |
kg/kg | 3D | mix_rto or hus |
| Surface geopotential height | m | 2D | zs, orog, topo or topog |
|
Surface temperature (including sea surface temperature) |
K | 2D | tss, tos or sfc_temp |
| Mean sea level pressure (optional) | Pa | 2D | mslp, psl or pmsl |
| Surface pressure | Pa | 2D | ps or sfc_pres |
| Land/sea mask (sea=0, land>0) | index | 2D | land, lsm, sftlf, sfc_lsm or land_mask |
| Sea ice cover fraction (optional) | fraction | 2D | fracice, sic or seaice |
| Snow depth (optional) | m | 2D | snod or snow_amt_lnd |
| Soil temperature (optional) | K | 3D | soil_temp |
| Soil moisture (optional) | m3/m3 | 3D | soil_moist |
Cdfvidar is call from the command line
cdfvidar < cdf.nml
The namelist switches used by cdfvidar are described below:
&gnml
kl – Number of vertical levels
t_file – Input air temperature
rh_file – Input relative humidity or mixing ratio or specific humidity
u_file – Input zonal wind
v_file – Input meridonal wind
z_file – (optional) input geopotential height
lsm_file – input land-sea mask
zs_file – input surface geopotential height
ps_file – input surface pressure
psl_file – (optional) input mean sea level pressure
ts_file – input surface temperature (or tos for water)
sic_file – (optional) input sea-ice fraction
snod_file – (optional) input snow depth file
soiltemp_file – (optional) input soil temperature file
soilmois_file – (optional) input soil moisture file
inf – (optional) single file input with all variables. Used for backwards compatibility.
zsfil – Topography file (from terread) to be used to remap the meteorological data
vfil – Output file for the conformal cubic grid
sgml – List of sigma levels for vertical interpolation