Table 1
Input parameters for the Pluto VTM and the values adopted in our sensitivity study.
| Parameter | Baseline value | Other values explored (in Cthulhu only) |
|---|---|---|
| N2 ice - albedo | 0.8 | 0.78-0.82 |
| N2 ice - emissivity | 0.9 | 0.88-0.92 |
| CH4 ice at high-latitudes - albedo | 0.71 | / |
| CH4 ice in the Bladed Terrain - albedo | 0.55 | / |
| CH4 ice in the Bladed Terrain and at high-latitudes - emissivity | 0.8 | / |
| CH4 ice in Cthulhu - albedo | 0.67 | 0.67-0.75 |
| CH4 ice in Cthulhu - emissivity | 0.8 | 0.79-0.81 |
| TICH4,d | 9 | 20 |
| TICH4,S | 800 | 600, 1000 |
| TIN2,d | 9 | 5, 20 |
| TIN2,S | 800 | 600, 1000 |
| TIbedrock, s | 800 | 600, 1000 |
| Large-scale winds U | 1 | 0.1, 2 |
Notes. For the sensitivity study, the parameter values were only varied within the Cthulhu region, while elsewhere, they remained fixed at their baseline values. The transition between the albedo of the bare surface and that of a CH4-frosted surface follows the parameterization of Bertrand et al. (2020). The values listed in this table correspond to the maximum albedo that a frosted surface can reach, typically for deposits thicker than −1 mm. TI refers to the thermal inertia, the subscript d corresponds to the diurnal thermal inertia, i.e., the first centimeters of the surface, and the subscript s refers to the seasonal thermal inertia (depths deeper than ~5 cm). The baseline values for the first five rows were adjusted to ensure a realistic representation of the seasonal N2 and CH4 cycles.
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