RegIPSL MED Wiki

The work on the MORCE started with the coupling of WRF and ORCHIDEE by Marc Stéfanon. For memory the original user guide for compiling and executing this version of MORCE is provided here.

Further to the choice of parametrization a number of standard domains are chosen for which all configuration files are provided. These are also domains over which the regional model is regularly run and thus some expertise exists.

The projection :

• Lambert conformal
• Standard longitude : 11°E
• True latitude 1 : 42°N
• True latitude 2 : 22°N
• Reference longitude : 11°E
• Reference Latitude : 32°N
• Number of points in East West : 180
• Number of points in North South : 156
• Resolution : 50km

The projection :

• Lambert conformal
• Standard longitude : 13°E
• True latitude 1 : 53°N
• True latitude 2 : 33°N
• Reference longitude : 13°E
• Reference Latitude : 43°N
• Number of points in East West : 301
• Number of points in North South : 193
• Resolution : 20km

namelist.wps

The namelist_WRF whih are used can be seen on the Git server for various configurations of the model. Here some of the desired features of WRF which were configured are explained.

The option in the namelist :

• grid_fdda = 2,
• gfdda_inname = “wrffdda_d<domain>”,
• gfdda_end_h = 800000,
• gfdda_interval_m = 360,
• fgdt = 0,
• if_no_pbl_nudging_uv = 1,
• if_no_pbl_nudging_t = 1,
• if_no_pbl_nudging_q = 1,
• guv = 0.00005,
• gt = 0.00005,
• gq = 0.00005,
• fgdtzero = 1,
• if_no_pbl_nudging_ph = 1,
• if_zfac_ph = 0,
• gph = 0.00005,
• xwavenum = 5,
• ywavenum = 3,

xwavenum and ywavenum define the wavelength which will be filtered. For our resolution and domain size this corresponds 1200 and 1920km according to the explantations given in http://forum.wrfforum.com/viewtopic.php?p=13020

• cu_physics = 1 : Kain-Fritsch (new Eta) scheme: deep and shallow sub-grid scheme using a mass flux approach with downdrafts and CAPE removal time scale.

This means that we need to have shcu_physics = 0 to ensure that shallow convection does not occur twice.

Corresponds to the explanations given here : https://esrl.noaa.gov/gsd/wrfportal/namelist_input_options.html

Table with the output variables from WRF through the standard file_def_wrf.xml used by XIOS.

A number of the diagnosed variables for COREX are produced by the module written by Lluis Fita : http://wiki.cima.fcen.uba.ar/mediawiki/index.php/CDXWRF

Four files are defined to store the various CORDEX variables :

1. wrfdaily.nc : Daily means or extrema for all requested variables.
2. wrfmontly.nc : Monthly averages.
3. wrf3h.nc :3 hourly file with the general rule that state variables are instantaneous and fluxes averaged.
4. wrf3d3h.nc : Variables on the original model levels at 3 hourly intervals. These are all instantaneous fields. This file is above the CORDEX requirements.

- Ocean points higher than XXXXm then they are turned into land points

- Islands of size 1 are turned into ocean points.