RFM Flags: Include line-coupling in spectral calculations
- Include line-mixing, also known as line-coupling,
for any CO2 lines for which (internal)
pretabulated data exists.
- RFM v5.10:
use the 1st order line coupling coefficients extracted for any molecule using
spectroscopic data in the RFM Basic format.
- Ignore line mixing
- Line-mixing (or line-coupling)
is primarily a correction affecting spectral regions where
line-intensities, and densities, are greatest. However, it does add
significantly to the computational cost. The general recommendation is to
try running the RFM with/without the MIX flag for the required calculations
and see if it makes sufficient difference to justify its inclusion.
- The standard HITRAN 160-character .par file format does not include
line-mixing coefficients, so the only option with this spectroscopic data is
to use the RFM's internal line mixing coefficients stored for CO2 lines,
which uses a first order model from Tobin & Strow (1994),
See subroutine ymix_fnc.f90 for details.
- The RFM Basic spectroscopic format,
introduced with RFM v5.10, allows for
line mixing parameters for any molecule (although in practice most entries
in the HITRAN database are blank).
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