RFM Examples

Nadir Brightness Temperature

15JAN21


Description

Off-Nadir viewing Brightness Temperature through the US Std Atmosphere.

*FLG section
NAD flag: downward viewing through a plane parallel atmosphere;
BBT flag: output the brightness temperature spectrum
SFC flag: (mandatory with nadir-viewing) surface is in the line-of-sight
*ATM section
CO2 concentration in the old US Std Atmosphere (330 ppmv) is modified to more recent value of 410 ppmv.
*SEC section
The value 1.015 corresponds to sec(10°), i.e., viewing 10° away from the vertical.
*SFC section
Specifies the surface temperature and emissivity, although in fact the values here (288.2 K is the same as the temperature at the base of the atmosphere in ../atm/usa.atm) are the values that would have been assumed in the absence of any *SFC section.

Driver Table

*HDR
09MAY19 RFM Example: nadir brightness temperature
*FLG
   NAD BBT SFC
*SPC
   1220 1230 0.1
*GAS
  CH4 CO2 H2O N2O
*ATM
   ../atm/usa.atm
  CO2=410
*SEC
  1.0
*HIT
  ../hit/hitran_2016.bin
*SFC
  TEMSFC=288.20 
  EMSSFC=1.0
*END

Output Files

Output Spectrum

[plot.py]