Technical Report No. ? - DKRZ

3.4.2 Afterburner
3.4.2.1 Overview
DKRZ GRIB/EXTRA Format Module Documentation
The afterburner is a program dealing with the model data of the specific truncations of the ECHAM
model (T21, T42, T63 and T106).
The name of the program is after or alternatively:
mod21, mod42, mod63 or mod106.
The last 4 names are symbolic links to after (held for traditional reasons).
The purpose of the program is to read, unpack, transform and select data from T-model GRIB files, and
write them either unformatted (unblocked SERVICE/afterburner format) or in GRIB format for further
processing using the GRIB Format programs descibed later on in this documentation.
The transformation capabilities of the afterburner include optional spectral transformation as well as
optional interpolation from originally 19 ECHAM hybrid levels to pressure levels.
The selection feature consists of code selection and level selection.
Selection and transformation can be combined, e.g. to write out the geopotential field, which is originally
represented as a grid point field on hybrid levels, as spectral coefficients on the 500 hPa pressure level.
3.4.2.2 Usage
The calling sequences of the program is:
where
/pf/k/k204004/burn/after inputdata outputdata [Debug] < namelist [>myoutput]
/pf/k/k204004/burn/after executable program (alternative names: see above)
inputdata path/filename of GRIB data
outputdata path/filename of resultfile in specified format
Debug optional parameter to check memory allocation (written on stderr)
namelist path/filename of namelistfile (structure: see below)
myoutput optional path/filename to redirect stdout
PAGE 3.4.2.1