Radiative-convective models of the atmospheres of Uranus and Neptune: Heating sources and seasonal effects

Open Access

Table 1

Best-fit haze scenario adapted from Irwin et al. (2022) that is consistent with the Bond albedo retrieved during the Voyager 2 flyby (Pearl et al. 1990; Pearl & Conrath 1991).

Haze/cloud layer	Parameter	Uranus	Neptune
Vertically	Bottom pressure (hPa) p₁	1600	1600
extended	Fractional scale height f₁	2.0	2.0
photochemical	Optical depth (at 0.8 µm) τ₁	0.04	0.05
haze	Particle radius (µm) r₁	0.05	0.05

Haze	Bottom pressure (hPa) p₂	1500	2000
concentrated	Fractional scale height f₂	0.1	0.1
near CH₄	Optical depth (at 0.8 µm) τ₂	2.0	1.0
condensation level	Particle radius (µm) r₂	0.8	0.8

Methane	Bottom pressure (hPa) $p_{{CH}_{4}}$ ${p_{{\rm{C}}{{\rm{H}}_4}}}$	–	200
cloud	Fractional scale height $f_{{CH}_{4}}$ ${f_{{\rm{C}}{{\rm{H}}_4}}}$	–	0.1
at the	Optical depth (at 0.8 µm) $τ_{{CH}_{4}}$ ${\tau _{{\rm{C}}{{\rm{H}}_4}}}$	–	0.03
tropopause	Particle radius (µm) $r_{{CH}_{4}}$ ${r_{{\rm{C}}{{\rm{H}}_4}}}$	–	2.5

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