RFM Examples

Unknown Absorbers

14AUG13


Description

Similar to the limb radiance example, but, apart from specifying CO2, allowing the RFM to choose which other absorbers are significant in the chosen spectral range.

In the *GAS section the *(14) entry allows the RFM to add any other absorbers above a particular strength ('12' is 'quite strong') - inspecting the rfm.runlog it can be seen that it chooses to add H2O and F12 (CFC-12).

Since it was not known in advance whether the RFM will choose to add any molecular cross-section data (F12 in this case), there is an additional entry in the driver table: the *XSC containing a directory with various .xsc files. The RFM makes the substitution f12 for the * character in ../xsc/*.xsc and finds f12.xsc (alternatively, the user could have explicity specifed various .xsc path/filenames in this section and the RFM would have inspected each searching for one, and only one, containing f12 cross-sections).

Driver Table

*HDR
14AUG13 RFM Example: unknown absorber selection
*FLG
   RAD
*SPC
   935 940 0.0005
*GAS
   CO2 *(12)
*ATM
   ../atm/usa.atm
*TAN
  20.0
*HIT
  ../hit/hitran_2012.bin
*XSC 
  ../xsc/*.xsc
*END

Output Files

Output Spectrum

[plot.pro]