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. Author manuscript; available in PMC: 2022 Jan 12.
Published in final edited form as: Space Sci Rev. 2020 Oct 26;216:122. doi: 10.1007/s11214-020-00751-1

Fig. 2.

Fig. 2

Tropospheric chemical abundances from Cassini VIMS. On first look, the profiles do not tell a consistent story. NH3 shows a high mole fraction at the equator, consistent with upwelling there and downwelling on either side at 10–12° latitude, but PH3 and AsH3 show low abundances at the equator, consistent with downwelling. The data may be indicating a double Hadley cell, with rising motion at the higher altitudes at the equator and sinking motion deeper down (Fletcher et al. 2011a)