-1013

2 x 10-7

585-610 (homopause)

Adapted from Atreya et al. (1999).

Adapted from Atreya et al. (1999).

convective processes dominate and thus it is assumed that K is either roughly a constant, or increases linearly with density. Hence, the functional dependence of K(z) in the atmosphere is usually parameterized as

where PT is the pressure at the tropopause; n(z) is the total number density; nH is the number density at the homopause; KH is the associated eddy-mixing coefficient; nT is the number density at the tropopause; and 7 is a coefficient close to 0.5 (Atreya, 1986). Note that this formulation allows for a discontinuity in K(z) at the tropopause. Typical estimated values of K(z) at different levels for the outer giant planets are listed in Table 4.2.

From Chapter 3 we saw that the molecular diffusion coefficient may be calculated as

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