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Fig. 3

image

Top row: vertical diffusion coefficient Kzz(r) = Hp·vz(r) [cm2 s-1] applying the smoothed vertical velocities of the radiative-hydrodynamic HD 189733b model at latitudes θ = 0° and θ = 45°, as a function of pressure at Δφ = + 45° longitude intervals. The Kzz(r) = 107p-0.65 (p [bar]) expression from Parmentier et al. (2013) is shown as dash-dotted lines. Middle row: the vertical mixing timescales τmix,diff [s] derived from the HD 189733b radiative-hydrodynamic model results at latitudes θ = 0°, θ = 45°, as a function of pressure at Δφ = + 45° longitude intervals. Bottom row: ratio of the mixing and advective timescales at θ = 0°, 45° respectively. The ratio of the timescales stays approximately equal at all pressures. Solid, dotted and dashed lines indicate dayside, day-night terminator and nightside profiles respectively.

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