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. Author manuscript; available in PMC: 2019 Mar 4.
Published in final edited form as: Icarus. 2017 Jun 15;297:33–58. doi: 10.1016/j.icarus.2017.06.002

Table 1:

Dust-Supplied Oxygen Influx Rates (cm−2 s−1) From Our Best-Fit Photochemical Models

CO H2O CO2 extra source
of H2O needed?		 extra source
of CO needed?
Jupiter 7 × 106 4 × 104 1 × 105 Yes (from SL9) Yes (from SL9)
Saturn* 6.7 × 104 7.2 × 103 < 1 × 103 Yes (Enceladus) Yes (comet?)
Uranus 2.7 × 105 1.2 × 105 3 × 103 No? No?
Neptune* 5 × 105 2 × 105 2.3 × 104 No Yes (comet)
*

Using the cometary models shown in Figs. 11 & 14.