Afterburner¶
The "afterburner" is the standard post processor for ECHAM data which provides the following operations:
- Extract specified variables and levels
- Compute derived variables
- Transform spectral data to Gaussian grid representation
- Vertical interpolation to pressure levels or height
- Compute temporal means
- Write data in GRIB, NetCDF, SERVICE or EXTRA format
Variables computed by the afterburner¶
| Code | Name | Longname | Units | Level | Needed Codes/Computation | Comment |
|---|---|---|---|---|---|---|
| 34 | low_cld | low cloud | single | 223 on modellevel | ||
| 35 | mid_cld | mid cloud | single | 223 on modellevel | ||
| 36 | hih_cld | high cloud | single | 223 on modellevel | ||
| 131 | u | u-velocity | atm (ml+pl) | 138, 155 | ||
| 132 | v | v-velocity | atm (ml+pl) | 138, 155 | ||
| 135 | omega | vertical velocity | Pa/s | atm (ml+pl) | 138, 152, 155 | |
| 148 | stream | streamfunction | atm (ml+pl) | 131, 132 | ||
| 149 | velopot | velocity potential | atm (ml+pl) | 131, 132 | ||
| 151 | slp | mean sea level pressure | surface | 129, 130, 152 | ||
| 156 | geopoth | geopotential height | atm (ml+pl) | 129, 130, 133, 152 | ||
| 157 | rhumidity | relative humidity | atm (ml+pl) | 130, 133, 152 | ||
| 189 | sclfs | surface solar cloud forcing | surface | 176-185 | ||
| 190 | tclfs | surface thermal cloud forcing | surface | 177-186 | ||
| 191 | sclf0 | top solar cloud forcing | surface | 178-187 | ||
| 192 | tclf0 | top thermal cloud forcing | surface | 179-188 | ||
| 259 | windspeed | windspeed | atm (ml+pl) | sqrt(u*u+v*v) | ||
| 260 | precip | total precipitation | surface | 142+143 | ||
| 261 | net_top | total top radiation | surface | 178+179 | Not available for ECHAM5 | |
| 262 | net_bot | total surface radiation | surface | 176+177 | Not available for ECHAM5 | |
| 263 | net_heat | net surface heat flux | surface | 146+147+176+177-220- C⋅218 | Not available for ECHAM5 | |
| 264 | net_water | total surface water | surface | 142+143+182-160-221 | Not available for ECHAM5 |
C = L f ⋅ ρ H2O
ρ H2O : Density of water
L f : Latent heat of fusion
Transform and interpolation (TYPE)¶
Transforming spectral data to Gaussian grid representation and vertical interpolation to pressure levels or height are performed in a chain of steps. The TYPE parameter may be used to stop the chain at a certain step.
| TYPE | Interpolation | Transformation | CDO equivalence | |
|---|---|---|---|---|
| 0 (default) | Hybrid level | spectral coefficients | sp2gp | |
| 10 | Hybrid level | fourier coefficients | ||
| 11 | Hybrid level | zonal mean sections | ||
| 20 | Hybrid level | gauss grids | ml2pl | |
| 30 | Pressure or Height level | gauss grids | gp2sp | |
| 40 | Pressure or Height level | fourier coefficients | ||
| 41 | Pressure or Height level | zonal mean sections | ||
| 50 | Pressure or Height level | spectral coefficients | sp2gp | |
| 60 | Pressure or Height level | fourier coefficients | ||
| 61 | Pressure or Height level | zonal mean sections | ||
| 70 | Pressure or Height level | gauss grids | ||