Table 1
Critical mass mixing ratio above which moist convection is inhibited for four of the most abundant condensible species.
| CH4 | NH3 | H2O | Fe | |
|
|
||||
| ϖ | 0.85 | 0.86 | 0.87 | 0.96 |
| Tref(K) | 80 | 150 | 300 | 3500 |
| Mv L/R Tref | 12. | 19. | 16. | 12. |
| Critical mixing ratio (qcri) | 0.10 | 0.062 | 0.070 | 0.089 |
| Enrichment over solar | 40. | 78. | 9.9 | 74. |
Notes. The conversion into enrichment factors (compared to solar) uses recent solar abundance estimates recommended by Lodders (2010), which explains the differences with the values derived in Guillot (1995). Tref is a crude estimate of the temperature at which the cloud deck of a given species would form in an atmosphere similar to Saturn’s but with a solar metallicity (note that methane does not condense in Saturn, and the temperature is estimated for Uranus).
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