Each participant will compute and deliver time and space averages of the outputs from the simulations with the mesoscale models.
In fact, it will be interesting to get the outputs both at the common, original, horizontal resolution of the models, for the purpose of intercomparison, and at a coarser one, more representative of the current temporal and spatial resolutions used in operational data assimilation, as well as in global climate experiments.
The temporal and spatial resolutions for writing out the model outputs are summarized in the following table:
| REQUIRED OUTPUTS | |
| HORIZONTAL RESOLUTIONS | 10 and 100 km |
| VERTICAL RESOLUTION | 25-1050 hPa by 25 hPa |
| TIME FOR AVERAGE | 15 minutes |
| FREQUENCY OF OUTPUTS | 1 hour |
| NUMBERS OF LONGITUDES | 151 and 16 |
| NUMBERS OF LATITUDES | 151 and 16 |
It is very important to notice that we advocate a time of 15 minutes for averaging the output fields, in order to filter out fluctuations with shorter timescales, which do not seem relevant in the present context.
The table below proposes a provisional list of fields to be saved in ECMWF GRIB format.
| CODE | 3D FIELDS (PRESSURE LEVELS) | UNITS |
| TEMP | TEMPERATURE | K |
| SHUM | SPECIFIC HUMIDITY | kg/kg |
| UWIN | ZONAL WIND | m/s |
| VWIN | MERIDIONAL WIND | m/s |
| OMEG | VERTICAL WIND | Pa/s |
| GEOP | GEOPOTENTIAL | m2.s-2 |
| RVOR | RELATIVE VORTICITY | s-1 |
| DIVG | HORIZONTAL WIND DIVERGENCE | s-1 |
| PCLD | PARTIAL CLOUD COVER | 0-1 |
| CLIQ | CLOUD LIQUID WATER | kg/kg |
| CICE | CLOUD ICE | kg/kg |
| COLP | CONVECTIVE LIQUID PRECIPIT. | kg.m-2.s-1 |
| STLP | STRATIFORM LIQUID PRECIPIT. | kg.m-2.s-1 |
| COIP | CONVECTIVE ICE PRECIPIT. | kg.m-2.s-1 |
| STIP | STRATIFORM ICE PRECIPIT. | kg.m-2.s-1 |
| CODE | 2D FIELDS | UNITS |
| PSRF | SURFACE PRESSURE | Pa |
| MSLP | MEAN-SEA-LEVEL PRESSURE | Pa |
| TCLD | TOTAL CLOUD COVER | 0-1 |
| IRFT | TOP ATMOSP. INFRARED FLUX | W.m-2 |
| IRFS | SURFACE INFRARED FLUX | W.m-2 |
| SWFT | TOP ATMOSP. SHORTWAVE FLUX | W.m-2 |
| SWFS | SURFACE SHORTWAVE FLUX | W.m-2 |
| LAFS | SURFACE LATENT HEAT FLUX | W.m-2 |
| SEFS | SURFACE SENSIBLE HEAT FLUX | W.m-2 |
| IWVA | INTEGRATED WATER VAPOR | kg.m-2 |
| ICLW | INTEGRATED CLOUD LIQ. WATER | kg.m-2 |
| ICIC | INTEGRATED CLOUD ICE | kg.m-2 |
| CLPS | CONVECTIVE LIQUID PRECIPIT. | kg.m-2.s-1 |
| SLPS | STRATIFORM LIQUID PRECIPIT. | kg.m-2.s-1 |
| CIPS | CONVECTIVE ICE PRECIPIT. | kg.m-2.s-1 |
| SIPS | STRATIFORM ICE PRECIPIT. | kg.m-2.s-1 |
| OROG | MODEL OROGRAPHY | m |
| LONG | LONGITUDE OF OUTPUT POINT | degrees |
| LATI | LATITUDE OF OUTPUT POINT | degrees |
For each time of output, all fields will be written out in a GRIB file, called ID.IE.RES.YYMMDDH0+HH, where:
Some supplementary fields will be essential for validating the assumptions made in the simplified cloud scheme developed at Météo-France.
In particular, the 15-minute averaged 3D contributions of all microphysical processes which are parameterized in each mesoscale model, will be diagnosed and archived every hour, at the model resolution.
For a given output time, all special fields will be written out in a GRIB file called ID.IE.MIC.YYMMDDH0+HH using the same notations as previously.
Among all possible microphysical processes, we can provisionally list:
| CODE | MICROPHYSICAL PROCESS |
| CONL | Condensation/Evaporation of cloud liquid water |
| CONI | Deposition/Sublimation of cloud ice |
| EVAR | Evaporation of rain |
| DEPS | Deposition/Sublimation of snow |
| AUTR | Autoconversion of cloud liquid water into rain |
| AUTS | Autoconversion of cloud ice into snow |
| COLR | Collection of cloud liquid water by rain |
| COIS | Collection of cloud ice by snow |
| COLS | Collection of cloud liquid water by snow |
| BERG | Bergeron-Findeisen mechanism |
| MELC | Melting/Freezing of cloud condensate |
| MELP | Melting/Freezing of precipitating particles |