Figure 12:

Mixing ratio profiles for H₂O (Top left), CO (Top right), CO₂ (Bottom left), and several hydrocarbons (Bottom right), as labeled, in Uranus’ atmosphere as a result of the ablation of oxygen-rich icy grains. The dashed lines represent a model in which all the ablated icy component is released as water (integrated flux of ~9 × 10⁴ H₂O molecules cm⁻² s⁻¹), the dotted lines represent a model in which all the ablated icy component is released as carbon monoxide (integrated flux of 9.0 × 10⁴ CO molecules cm⁻² s⁻¹), and the solid lines represent a model in which the relative influx rates (1.2 × 10⁵ H₂O molecules cm⁻² s⁻¹, 2.7 × 10⁵ CO molecules cm⁻² s⁻¹, 3.0 × 10³ CO₂ molecules cm⁻² s⁻¹) are scaled to fit the H₂O, CO, and CO₂ observations of Feuchtgruber et al. (1999), Cavalié et al. (2014), Teanby and Irwin (2013), and Orton et al. (2014b). The data points with error bars represent various observational constraints (see text). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)