...
- the model namelists
- initial files
- no changes to the code are required for the Neale & Hoskins cases; other configurations may require code changes.
Dynamical core
...
The model namelist NAMDYNCORE This controls the configuration for the model's dynamical core.
Edit To enable the aqua-planet edit the fort.4 file (containing the input model namelist) and make sure the settings are as below. You may find this namelist is blank in your file as it does not need altering for normal forecasts, in which case add the following:
...
| Code Block | ||
|---|---|---|
| ||
&NAEPHY LEPHYS=true, ! switch the full ECMWF physics package on/off. LEVDIF=true, ! turn on/off the vertical diffusion scheme. LESURF=true, ! turn on/off the interface surface processes. LECOND=true, ! turn on/off the large-scale condensation processes. LECUMF=true, ! turn on/off the mass-flux cumulus convection. LEPCLD=true, ! turn on/off the prognostic cloud scheme. LEEVAP=true, ! turn on/off the evaporation of precipitation LEVGEN=true, ! turn on/off Van Genuchten hydrology (with soil type field) LESSRO=true, ! turn on/off orographic (VIC-type) runoff LECURR=false, ! if true, ocean current boundary condition is used. LEGWDG=true, ! turn on/off gravity wave drag. LEGWWMS=true, ! turn on/off the Warner-McIntyre-Scinocca non-orographic gravity wave drag scheme. LEOZOC=true, ! turn on/off the climatological ozone. LEQNGT=true, ! turn on/off the negative humidity fixer. LERADI=true, ! turn on/off the radiation scheme. LERADS=true, ! turn on/off the interactive surface radiative properties. LESICE=true, ! turn on/off the interactive sea-ice processes. LEO3CH=false, ! turn on/off the ozone chemistry (for prognostic ozone). LEDCLD=true, ! turn on/off the diagnostic cloud scheme. LDUCTDIA=false, ! turn on/off computation and archiving of ducting diagnostics. LWCOU=false, ! turn on/off coupled wave model (n.b. always off for OpenIFS model version 38r1). LWCOU2W=false, ! turn on/off two-way interaction with the wave model (n.b. always off for OpenIFS model version 38r1). / |
Initialisation
OpenIFS (and IFS) can be initialized either with real fields or idealized starting conditions.This is controlled both by the namelist switch N3DINI and by the code in the model.
It is crucial that the orography, surface pressure and land-sea-mask are set correctly (see below).
| Code Block | ||
|---|---|---|
| ||
&NAMCT0 N3DINI=0, ! normally 0 to initialise the model from a real atmosphere, but see ifs/module/yomdyncore.F90 for other possibilities. |
Orography, surface pressure and land-sea mask
In order to correctly run the aqua-planet in OpenIFS (and IFS), it is important that the orography field in the model is set to zero to ensure a flat surface. The surface pressure must also be adjusted to be consistent with the flat orography and the land-sea-mask in the model set to zero to indicate all sea-points.
There are two ways in which this can be achieved; either take an existing set of model initial files (the ICM*INI* files) and interpolate
Also see
ECMWF took part in the 2012 Dynamical Core Model Intercomparison Project (DCMIP). More information can be found here: https://www.earthsystemcog.org/projects/dcmip-2012/
Acknowledgements
OpenIFS would like to thank Sylvie Malardel (ECMWF) and Peter Bechtold (ECMWF) for their assistance in preparing this material
...