The DDH files ------------- DDH stands for "Diagnostique des Domaines Horizontaux". It is the diagnostics package in the IFS (Integrated Forecasting System) and was originally developed at Meteo France as part of the IFS/ARPEGE collaboration. The DDH is used to write out time series of model profiles, fluxes and tendencies at specified locations. A series of parameters are extracted for a set of forecast times and put in daily data files with the following naming convention (after uncompressing and untarring the data file): project_experiment_DOMAIN_DATE_VAR with: DOMAIN location (ddh identification #) e.g. 51 : 84.96W 19.84S (closest model point to 85W 20S) (see data files for location used) DATE starting date of the forecast plus one (daily 12 UTC forecast) VAR different files exist for each experiment: atmvar: Variables on NLEV full model levels (NLEV=60 or 91). Level 1 is the top full level of the model, level NLEV is the lowest full level. atmflx: Fluxes on NLEV+1 half model levels ("flux levels"). The full levels on which the variables are stored are placed between two flux levels. Hence, level NLEV+1 represents the surface and level 1 the top of the atmosphere. Full level k is between half level k and k+1. The fluxes in level NLEV+1 are the surface fluxes !!! The fluxes are averages over the last hour. atmten: Tendencies (total and physical) for u,v,T and q on full model levels. ps: Surface pressure (including initial condition). sfcdia: Surface diagnostic variables and fluxes. The level number is set to 1. The fluxes are averages over the last hour. landsfc: Land variables at the surface. landvar: Land variables at soil levels (4). landflx: Land fluxes at soil levels (top and bottom). Every data file starts with a header (first 3 lines). The first line explains the second. The first four parameters on the second line are model internal parameters and are irrelevant for the user. The next two numbers mark the model point for which the data was archived (note that the model resolution is about 39.1km for T511 and 25.0km for T799). The third line has the headers for the columns which follow. 'idat' and 'itim' are the initial date and time of the forecast from which the data was retrieved. 'vdate' and 'vtime' are the verifying date and time of the data meaning date and time which it is valid for. Hence the difference to the initial date and time indicates the forecast range used. The next column ('lev') is the model level of the data followed by the data itself, which varies from file to file. The pressure of each of the model levels can be retrieved from the *atmvar* file, where it is stored in the first data column. Notes: * Very small (.lt.1.E-10 for precipitation and .lt. 1.E-1 for radiation) and small negative numbers in solar radiation and precipitation are due to packing and unpacking mechanisms and do not represent model problems ! * "suggest": For missing standard_name's this name might be suggested to the CF email group. * "where land:" Basin-averaged quantities weighted by the land-sea mask. * Some convenient unit conversions: Pa = kg/m3 * m/s * m/s mm/s = kg/kg * kg/(m2*s) Name Description Remark File Level ECUnit CFunit CFfactor GRIB # NetCDF CF standard_name (CF=f*EC) (ECMWF) P INIT Pressure atmvar ml 1-60 Pa Pa 1 152 air_pressure U INIT U-component wind atmvar ml 1-60 m/s m/s 1 131 eastward_wind V INIT V-component wind atmvar ml 1-60 m/s m/s 1 132 northward_wind T INIT Temperature atmvar ml 1-60 K K 1 130 air_temperature Q INIT Specific humidity atmvar ml 1-60 kg/kg kg/kg 1 133 specific_humidity L INIT Specific cloud liquid water atmvar ml 1-60 kg/kg kg/kg 1 246 mass_fraction_of_cloud_liquid_water_in_air I INIT Specific coud ice water atmvar ml 1-60 kg/kg kg/kg 1 247 mass_fraction_of_cloud_ice_in_air A INIT Cloud fraction atmvar ml 1-60 (0-1) (0-1) 1 248 cloud_area_fraction_in_atmosphere_layer R INIT Relative humidity atmvar ml 1-60 (0-1) (0-1) 1 157 relative_humidity W INIT W-component wind in p-coor. (omega) atmvar ml 1-60 Pa/s Pa/s 1 135 lagrangian_tendency_of_air_pressure S INIT Surface pressure ps ml 1 Pa Pa 1 152 air_pressure U FVDF U flux: Vert diffusion (rho*u'w') atmflx ml 1-61 Pa suggest: eastward_momentum_flux_due_to_diffusion V FVDF V flux: Vert diffusion (rho*v'w') atmflx ml 1-61 Pa suggest: northward_momentum_flux_due_to_diffusion T FVDF T flux: Vert diffusion (rho*cp*T'w') atmflx ml 1-61 W/m2 suggest: dry_static_energy_flux_due_to_diffusion Q FVDF Q flux: Vert diffusion (rho*q'w') atmflx ml 1-61 mm/day suggest: specific_humidity_flux_due_to_diffusion U FTCN U flux: convective (rho*u'w') atmflx ml 1-61 Pa V FTCN V flux: convective (rho*v'w') atmflx ml 1-61 Pa T FTCN T flux: convective (rho*cp*T'w') atmflx ml 1-61 W/m2 Q FTCN Q flux: convective moisture flux atmflx ml 1-61 mm/s Q FCVR Q flux: convective rain flux atmflx ml 1-61 mm/s Q FCVN Q flux: convective snow flux atmflx ml 1-61 mm/s Q FLSR large-scale rain flux atmflx ml 1-61 mm/s Q FLSN large-scale snow flux atmflx ml 1-61 mm/s T FLWR T flux: net longwave flux atmflx ml 1-61 W/m2 W/m2 1 net_downward_longwave_flux_in_air T FSWR T flux: net shortwave flux atmflx ml 1-61 W/m2 W/m2 1 net_downward_shortwave_flux_in_air U TTOT U total atmten ml 1-60 m/s2 U TPHY U physics atmten ml 1-60 m/s2 V TTOT V total atmten ml 1-60 m/s2 V TPHY V physics atmten ml 1-60 m/s2 T TTOT T total atmten ml 1-60 K/s T TPHY T physics atmten ml 1-60 K/s Q TTOT Q total atmten ml 1-60 1/s Q TPHY Q physics atmten ml 1-60 1/s SFSSWDO Sfc SW downward radiation sfcdia sfc W/m2 W/m2 1 surface_downwelling_shortwave_flux_in_air SFSLWDO Sfc LW downward radiation sfcdia sfc W/m2 surface_downwelling_longwave_flux_in_air SFSSW Sfc SW net radiation sfcdia sfc W/m2 W/m2 1 surface_net_downward_shortwave_flux SFSLW Sfc LW net radiation sfcdia sfc W/m2 W/m2 1 surface_net_downward_longwave_flux SFSSWC sfc SW net rad. clear sky sfcdia sfc W/m2 210 surface_downwelling_shortwave_flux_in_air_assuming_clear_sky SFSLWC sfc LW net rad. clear sky sfcdia sfc W/m2 211 surface_downwelling_longwave_flux_in_air_assuming_clear_sky SFSTISR Top SW downward radiation sfcdia sfc W/m2 212 SFSTSRC Top SW net rad. clear sky sfcdia sfc W/m2 208 SFSTTRC Top LW net rad. clear sky sfcdia sfc W/m2 209 SFSSLHF Sfc latent heat flux sfcdia sfc W/m2 W/m2 -1 surface_upward_latent_heat_flux SFSSSHF Sfc sensible heat flux sfcdia sfc W/m2 W/m2 -1 surface_upward_sensible_heat_flux SFSLSR Large-scale rainfall sfcdia sfc kg/m2/s kg/m2/s 1 large_scale_rainfall_flux SFSCR Convective rainfall sfcdia sfc kg/m2/s kg/m2/s 1 convective_rainfall_flux SFSLSF Large-scale snowfall sfcdia sfc kg/m2/s kg/m2/s 1 large_scale_snowfall_flux SFSCF Convective snowfall sfcdia sfc kg/m2/s kg/m2/s 1 convective_snowfall_flux SFSLCC Low cloud cover sfcdia sfc (0-1) 186 suggest: low_cloud_aread_fraction SFSMCC Mid-level cloud cover sfcdia sfc (0-1) 187 suggest: middle_cloud_aread_fraction SFSHCC High cloud cover sfcdia sfc (0-1) 188 suggest: high_cloud_aread_fraction SFSTCC Total cloud cover sfcdia sfc (0-1) (0-1) 1 164 cloud_area_fraction SFSBLH Boundary layer height sfcdia sfc m m 1 159 atmosphere_boundary_layer_thickness SFST2M 2m Temperature sfcdia sfc K 167 suggest: air_temperature_2m SFSQ2M 2m Specific humidity sfcdia sfc kg/kg suggest: specific_umidity_2m SFS10U 10m U-comp wind sfcdia sfc m/s 165 suggest: eastward_wind_10m SFS10V 10m V-comp wind sfcdia sfc m/s 166 suggest: northward_wind_10m SFSTSK Skin temperature sfcdia sfc K 235 surface_temperature SFSZ0M Surface Roughness sfcdia sfc m SFSZ0H Surface Roughness Heat sfcdia sfc m SFSFG Wind gusts sfcdia sfc m/s SFSVIMD Vert. integrated moisture divergence sfcdia sfc kg/m2 213 SFSLSPF LS precip. fraction (accum.) sfcdia sfc s SFSE Total evaporation sfcdia sfc kg/m2/s kg/m2/s 1 water_evaporation_flux SFSRO Total runoff sfcdia sfc kg/m2/s kg/m2/s 1 runoff_flux SFSES Snow evaporation sfcdia sfc kg/m2/s suggest: surface_snow_evaporation_flux STSLWDO Snow downward longwave sfcdia sfc W/m2 STSSWDO Snow downward solar sfcdia sfc W/m2 SFSSMLT Snowmelt sfcdia sfc kg/m2/s kg/m2/s 1 surface_snow_melt_flux STSG Snow basal heat flux where land sfcdia snow W/m2 suggest: snow_basal_heat_flux STSMLT Snow phase change energy where land sfcdia snow W/m2 suggest: snowmelt_energy SSSE Snow evaporation where land sfcdia snow kg/m2/s suggest: surface_snow_evaporation_flux_where_land SSSMLT Snowmelt where land sfcdia snow kg/m2/s suggest: snowmelt SIIE Intercepted water evap where land sfcdia sfc kg/m2/s suggest: wet_canopy_evaporation S HIST surface pressure sfcdia sfc Pa STTT0 1 Soil temperature where land landvar s1 K K 1 surface_temperature_where_land SWLL0 1 Soil water where land landvar s1 kg/m2 suggest: soil_liquid_water_mass SWLI0 1 Soil ice water where land landvar s1 kg/m2 suggest: soil_ice_water_mass STTT0 2 Soil temperature where land landvar s2 K suggest: soil_temperature SWLL0 2 Soil water where land landvar s2 kg/m2 suggest: soil_liquid_water_mass SWLI0 2 Soil ice water where land landvar s2 kg/m2 suggest: soil_ice_water_mass STTT0 3 Soil temperature where land landvar s3 K suggest: soil_temperature SWLL0 3 Soil water where land landvar s3 kg/m2 suggest: soil_liquid_water SWLI0 3 Soil ice water where land landvar s3 kg/m2 suggest: soil_ice_water_mass STTT0 4 Soil temperature where land landvar s4 K suggest: soil_temperature SWLL0 4 Soil water where land landvar s4 kg/m2 suggest: soil_liquid_wa'er SWLI0 4 Soil ice water where land landvar s4 kg/m2 suggest: soil_ice_water_mass SWTT0 4 Soil temperature where land landvar s4 K suggest: soil_temperature STST0 Snow temperature where land landsfc sfc K K 1 suggest: snow_temperature_where_land STSCT0 Snow thermal energy where land landsfc sfc Jm-2 suggest: snow_thermal_energy SSSS0 Snow mass where land landsfc sfc kgm-2 m 0.001 suggest: surface_snow_amount_where_land SIII0 Intercepted water content where land landsfc sfc kgm-2 suggest: intercepted_water (on vegetation) SWLRO 1 Surface runoff where land landflx s1 kg/m2/s kg/m2/s 1 suggest: surface_runoff_flux_where_land SWLRO 4 Drainage where land landflx s4 kg/m2/s kg/m2/s 1 suggest: subsurface_runoff_flux