ATMOSPHERIC TEMPERATURE SOUNDING

1. ATMOSPHERIC TEMPERATURE SOUNDING If radiation is selected in a sounding channel for which and we define a functionK(z) = When the primary absorber is a well mixed gas (e.g. oxygen or CO2) with known concentration it can be seen that the measured radiance is essentially a weighted average of the atmospheric temperature profile, or The function K(z) that defines this vertical average is known as a WEIGHTING FUNCTION

2. MODIS CO2 band weighting functions Example spectra (~ 12.65-14 µm) CO2slicing: weighting functions Bands w/greater CO2 absorption have weighting functions more sensitive to high clouds S. Platnick, ISSAOS ‘02

3. BT in and out of clouds for MODIS CO2 bands S. Platnick, ISSAOS ‘02

5. MODIS CO2 band weighting functions Example spectra (~ 12.65-14 µm) CO2slicing: weighting functions Bands w/greater CO2 absorption have weighting functions more sensitive to high clouds S. Platnick, ISSAOS ‘02

6. Cross section [m2] ρ5,T5,P5 > ρ4,T4,P4 > ρ3,T3,P3 > ρ2,T2,P2 > ρ1,T1,P1

8. MODIS CO2 band weighting functions Example spectra (~ 12.65-14 µm) CO2slicing: weighting functions Bands w/greater CO2 absorption have weighting functions more sensitive to high clouds S. Platnick, ISSAOS ‘02

10. MODIS CO2 band weighting functions Example spectra (~ 12.65-14 µm) CO2slicing: weighting functions Bands w/greater CO2 absorption have weighting functions more sensitive to high clouds S. Platnick, ISSAOS ‘02

12. MODIS CO2 band weighting functions Example spectra (~ 12.65-14 µm) CO2slicing: weighting functions Bands w/greater CO2 absorption have weighting functions more sensitive to high clouds S. Platnick, ISSAOS ‘02

14. INSTABILITY INDICES

15. MSG Lifted Index