RFM Absorbers

03OCT05

Notes

1. When specifying absorbers in the *GAS section of the Driver Table, the RFM accepts either the ID, the chemical formula (case-insensitive) or, in the case of CFCs/HFCs, the F code. The maximum length of the field is limited to 7 characters, so for certain HFCs only the F code can be used (eg F123)
2. The intention is to maintain the HITRAN indices as a subset of the RFM, so as the HITRAN dataset expands (see HITRAN web-site) the RFM-specific indices 39 onwards may assigned to different molecules.
3. SF6 and ClONO2 are represented both as HITRAN line data (usually just the Q-branch) and cross-section data. The RFM expects the cross-section data by default (as is usually recommended) but to get the line data explicitly, either append 'q' (or 'Q') to the molecule name or use the HITRAN index.
4. HDO (deuterated water), if listed by the user in the driver table, is treated as a separate gas (otherwise it is included with the other H2O isotopes as having the same mixing ratio profile)
5. The absorbers X65 - X69 are for user-defined cross sections. To use these, eg defining X65 as benzene,
   • Create a .xsc file (eg benzene.xsc) containing the tabulated absorption as a function of wavenumber, pressure and temperature and include this filename in the *XSC section of the Driver Table. The header record for each (p,T) table must contain the corresponding ID, ie 65.
   • Create an .atm atmospheric profile in ppmv (eg benzene.atm), using the internal species name *X65, and include this filename in the *ATM section of the Driver Table.
   • Add the gas either as X65 or 65 to the *GAS section of the Driver Table.
   If you want to 'hard-wire' in your own names (max length C*7) instead of X65, etc., change the data statement for array CODMOL in subroutine gaschk.for from, eg, 'x65' to 'benzene'

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