Latitudinal variations in the temperature and composition of Saturn's upper troposphere from Cassini/CIRS

The Cassini Composite Infrared Spectrometer (CIRS, Flasar et al., 2004) has been used to derive the meridional variation of temperature, phosphine (PH3) and ammonia (NH3) abundance in Saturn’s upper troposphere (0.8 to 0.1 atm). Since orbital insertion in July 2004, CIRS has recorded thousands of spectra in both the far (10 600 cm−1) and mid (600 1400 cm−1) infrared, at a variety of apodized spectral resolutions (0.5 15.0 cm−1) and viewing geometries, covering both hemispheres of the gas giant.