Mixing ratios of acetylene (left) and ethane (right) on Uranus as a function of season (represented by solar longitude Ls) at 0.1 mbar (top), 0.2 mbar (middle), and 1 mbar (bottom). Results are shown for five different latitudes: −9° (red), −27° (orange), −45° (green), −63° (blue), and −81° (magenta). Seasonal variations are muted in general on Uranus but are more pronounced at lower pressures (higher altitudes). (For interpretation of the references to color in this figure legend, the reader is referred to the online version of this article.)