Model
IFS-H is a hydrostatic spectral transform model with a semi-Lagrangian semi-implicit solution procedure, discretised on a cubic octahedral grid (Wedi 2014, Malardel et al. 2016). Here we used the single precision version of IFS (cycle 45r2). Information on IFS can be found at:
https://www.ecmwf.int/en/forecasts/documentation-and-support/changes-ecmwf-model/ifs-documentation
Grid Resolution
Here we offer two runs with TCo1279 (~9km) (ECMWF's operational configuration) and TCo2559 (~4km) following the Dyamond protocol. The runs use 137 vertical levels (data provided from level 137 to level 25). The number of grid columns is 26 306 560 (4km) and 6 599 680 (9km). The vertical discretisation uses hybrid vertical levels defined as A(eta) + B(eta)*p_s, with A, B fixed defined parameters and where p_s is the provided surface pressure. Pressure on model levels needs to be calculated by the given formula.
Output
gg_uv_mars_out_ml_vor_div_sh.*.grib, output interval: PT03h (levels 125-137)
Please ignore the dates indicated in these files and concentrate on step for time.
| u | velocity u |
| v | velocity v |
mars_out.*, output interval: PT01h
| ci | sea ice area fraction |
| asn | snow albedo |
| rsn | snow density |
| sst | sea surface temperature |
| istl1 | ice temperature layer 1 |
| istl2 | ice temperature layer 2 |
| istl3 | ice temperature layer 3 |
| istl4 | ice temperature layer 4 |
| swvl1 | volumetric soli water layer 1 |
| swvl2 | volumetric soli water layer 2 |
| swvl3 | volumetric soli water layer 3 |
| swvl4 | volumetric soli water layer 4 |
| es | snow evaporation |
| smlt | snowmelt |
| dsrp | direct solar radiation |
| lspf | large-scale precipitation fraction |
| uvb | downward UV radiation at the surface |
| par | photosynthetically active radiation at the surface |
| cape | convective available potential energy |
| tclw | total column liquid water |
| tciw | total column cloud ice water |
| z | geopotential |
| tcw | total column water |
| tcwv | total column water vapour |
| stl1 | soil temperature level 1 |
| Sd | solar duration |
| lsp | large-scale precipitation |
| cp | convective precipitation |
| tp | total precipitation |
| sf | snowfall |
| bld | boundary layer dissipation |
| sshf | surface sensible heat flux |
| slhf | surface latent heat flux |
| chnk | Charnock |
| msl | mean sea level pressure |
| blh | boundary layer height |
| tcc | total cloud cover |
| 10 u | 10m zonal wind |
| 10 v | 10m meridional wind |
| 2 t | 2m temperature |
| 2d | 2 metre dewpoint temperature |
| ssrd | surface solar radiation downwards |
| stl2 | soil temperature level 2 |
| lsm | land sea mask |
| strd | surface thermal radiation downwards |
| ssr | sub-surface runoff |
| str | surface net thermal radiation |
| tsr | top net solar radiation |
| ttr | top net thermal radiation |
| ewss | eastward turbulent surface stress |
| nsss | northward turbulent surface stress |
| e | evaporation |
| stl3 | soil temperature level 3 |
| lcc | low cloud cover |
| mcc | medium cloud cover |
| hcc | high cloud cover |
| sund | sunshine duration |
| lgws | eastward gravity wave surface stress |
| mgws | northward gravity wave surface stress |
| gwd | gravity wave dissipation |
| src | skin reservoir content |
| ro | runoff |
| tsrc | top net solar radiation |
| ttrc | top net thermal radiation |
| ssrc | surface net solar radiation |
| strc | surface net thermal radiation |
| skt | skin temperature |
| stl4 | soil temperature level 4 |
| tsn | temperature of snow layer |
| fal | forecast albedo |
| fsr | forecast surface roughness |
| flsr | forecast logarithm of surface roughness for heat |
| iews | instantaneous eastward turbulent surface stress |
| inss | instantaneous northward turbulent surface stress |
| ishf | instantaneous surface sensible heat flux |
| ie | instantaneous moisture flux |
| vimd | vertically integrated moisture divergence |
| tisr | TOA incident solar radiation |
| sro | surface runoff |
| ssro | sub-surface runoff |
| tcrw | total column rain water |
| tcsw | total column snow water |
| cin | convective inhibition |
| kx | k index |
| totalx | total totals index |
| vis | visibility |
| i10fg | instantaneous 10 metre wind gust |
| pev | potential evaporation |
| fzra | accumulated freezing rain |
| ilspf | instantaneous large-scale surface precipitation fraction |
| crr | convective rain rate |
| lsrr | large scale rainfall rate |
| csfr | convective snowfall rate water equivalent |
| lssfr | large scale snowfall rate water equivalent |
| ptype | precipitation type |
mars_out_ml_moist.*, output interval: PT03h
| q | specific humidity |
| clwc | specific cloud liquid water content |
| ciwc | specific cloud ice water content |
mars_out_pl_gg.*, output interval: Pt1h
| w | vertical velocity m/s |
| r | relative humidity |
mars_out_sfc_ps_orog_gg.*, output interval: Pt3h
| lnsp | logarithm of surface pressure |
| geopotential | Topography stored as geopotential (z). Multiply with 1/g ? m |
gg_mars_out_ml_upper_sh.*.grib, output interval: Pt3h (levels 125-137)
| t | temperature |
| vertical velocity/omega in Pa/s |
Soil Initialisation
Initial soil data from the ECMWF IFS model state at the initialisation date are time and spatially interpolated.
Input Data
Input data are extracted from mars for the specified start date 2016080100.
Treatment of SST and Sea Ice
Daily updated SST/CI from ECMWF analysis is used.