Zenith Transmittance

RFM Examples

03JUL24

Description

Calculate vertical transmittance spectrum through the US Std Atmosphere.
*FLG section
ZEN flag: upward path through a plane parallel atmosphere
TRA flag: output the transmittance spectrum.
*GAS section
H2O, O3, N2O and F12 (CFC-12) are to be included
*(12): add any other gases that might be significant in this spectral range (from rfm.log it can be seen that it chooses to add CH4, F22 (HCFC-22), F11 (CFC-11) and CO2).
Although N2O is included because it was explicitly specified by the user, the RFM wouldn't have added it itself.
*SEC section (although *TAN could also be used)
Since this is a plane parallel atmosphere calculation, the path is specified by sec(zenith angle), the value 1.0 defining the vertical path (1.0 = 1/cos(0°))

Driver Table

*HDR 03JUL24 RFM Example: zenith transmittance *FLG ZEN TRA *SPC 1100 1110 0.1 *GAS H2O O3 N2O F12 *(12) *ATM ../atm/usa.atm *SEC 1.0 *HIT ../hit/hitran_2016.bin *XSC ../xsc/*.xsc *END

Output Files

Output Spectrum

[plot.py]