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Titan's stratosphere has been observed in a superrotation state, where theatmosphere rotates many times faster than the surface does. Anothercharacteristics of Titan's atmosphere is the presence of thick haze layer. Inthis paper, we performed numerical experiments using a General CirculationModel (GCM), to explore the effects of the haze layer on the stratosphericsuperrotation. We employed a semi-gray radiation model of Titan's atmospherefollowing McKay et al. (1999), which takes account of the sunlight absorptionby haze particles. The phase change of methane or the seasonal changes were nottaken into account. Our model with the radiation parameters tuned for Titanyielded the global eastward wind around the equator with larger velocities athigher altitudes except at around 70 km after $10^5$ Earth days. Although theatmosphere is not in an equilibrium state, the zonal wind profiles isapproximately consistent with the observed one. Analysis on our experimentssuggests that the quasi-stationary stratospheric superrotation is maintained bythe balance between the meridional circulation decoupled from the surface, andthe eddies that transport angular momentum equatorward. This is different from,but similar to, the so-called Gierasch mechanism, in which momentum is suppliedfrom the surface. This structure may explain the no-wind region at about $80$km in altitude.

Superrotation of Titan's stratosphere driven by the radiative heating of the haze layer