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EGOPSv52 SUM-OV
5.4 Use of RFM/HITRAN
For FOMod forward modeling at IR wavelengths, EGOPS uses the RFM (Reference Forward Model)
software for the computation of absorption coefficients in the IR spectral range. RFM is not distributed
with the EGOPS software package and not statically linked into EGOPS. It has to be ordered from Anu
Dudhia, the lead developer of RFM. Detailed Information on ordering and on the RFM software in
general can be found on the RFM web page at http://www.atm.ox.ac.uk/RFM/.
In addition to the RFM software, the HITRAN (HIgh-resolution TRANSmission molecular absorption)
database is required, which serves as input for RFM calculations. Information on ordering and on the
content of the HITRAN database may be found on HITRAN web page at
http://cfa-www.harvard.edu/hitran/.
For installing RFM/HITRAN support in EGOPS, source code users are requested to procure the RFM
software package Version 4.27, dated 04-APR-2006, named rfm_v4.27_04APR.tar.Z, from A. Dudhia
and put it into the directory ../EGOPS/src/external/ and repackage and rename it into rfm.tar.gz. Since
the use of RFM within EGOPS requires modifications to the original RFM source code, it is of utmost
importance to use RFM Version 4.27.
Furthermore, the HITRAN04.par file has to be prepared for RFM use as follows:
1) Procure the files hitbin.for and hitfmt.for from the RFM website at
http://www.atm.ox.ac.uk/RFM/rfm_downloads.html#for.
2) Reformat the content of HITRAN04.par, which has a format of 160 characters per record, to the a
format with 100 characters per record (this format was used between 1986 and 2001) using the hitfmt
utility: compile hitfmt.for with "f77 hitfmt.for -o hitfmt” and run hitfmt as described at the RFM web
page at http://www.atm.ox.ac.uk/RFM/rfm_downloads.html#for.
3) Convert the HITRAN ASCII file (HITRAN04.par, C*100 format) to binary format HITRAN04.bin
using the hitbin utility: compile hitbin.for with "f77 hitbin.for -o hitbin” and run un hitbin as described
at the RFM web page at http://www.atm.ox.ac.uk/RFM/rfm_downloads.html#for.
4) Rename the file HITRAN04.bin to HITRAN04_2k.bin and move it to the ..EGOPS/settings/hitran
directory (the name HITRAN04_2k.bin is a string constant defined in ../src/base/egopsParameter.f90).
5) Perform a complete compilation of EGOPS as described in Section 5.1.4, ‘Installation Procedure for
Source Code Users’.
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