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(a)
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Relative variance in specific humidity
(b)
1.2
1.0
0.8
Turbulent
transport
0.6
Production
0.4
Molecular
destruction
0.2
0
1000
100
10
0
10
100
1000
Relative strength of terms in moisture variance budget
Figure 18.9 (a) Typical relative strength of daytime moisture variance as a function of height relative to the top of the ABL.
(b) Typical relative strength of terms in the prognostic equation for daytime moisture variance as a function of height
relative to the top of the ABL. Note that there is very substantial variability around these typical values.
the variance in potential temperature, and Fig. 18.10b the typical relative
strength of the terms in Equation (18.20), both as a function of height relative to
the top of the ABL. The production and dissipation terms are greatest near the
top and bottom of the ABL as is the (smaller) radiation term (because this is
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