An analysis of Saturn's methane 3ν3 band profiles in terms of an inhomogeneous atmosphere

Observed profiles of the R branch of Saturn's CH₄3v₃ band are compared with synthetic profiles computed from inhomogeneous models which are consistent with Saturn's H₂ quadrupole line equivalent widths. A C/H ratio approximately three times the solar value and a CH₄ abundance of about 100 mam are found. Scattering plays a significant role in the formation of manifold profiles below a depth where the H₂ abundance is 20–30 km am.