data. If no measurements of M2

/Mzare available, in that height range, then 2

*is calculated bycombining eqs. (8) and (20). 2

*is not used in the CBL.Figure 5 shows the inverse height dependency of M2

/Mzin the SBL. To create this curve weassumed that:

Zim=100 m; and therefore,Zi2=100 m;L=10 m;u*=.124, which is consistent witha mixing height of 100 m;

Tref =293 K; and therefore based on eq. (11) 2

* =0.115 K. Theseparameter values were chosen to represent a strongly stable boundary layer. Below 2 m M2

/Mzispersisted downward from its value of 0.228 K m-1 at 2m. Above 100 m M2

/Mzis allowed to decayexponentially with height.

4.1.4 POTENTIAL TEMPERATURE PROFILING

For use in plume rise calculations, AERMOD develops the vertical profile of potential

temperature from its estimate of the temperature gradient profile First the model computes the

potential temperature at the reference height for temperature (i.e.,

zTref) as

where

z z zandzbaseis the user specified elevation for the base of the temperaturemsl ref base= +profile (i.e., meteorological tower). Then for both the CBL and SBL the potential temperature is

calculated as follows:

where is the average potential temperature gradient over the layer )

z. Note that forz <

zTref, )zis negative.4.1.5 VERTICAL TURBULENCE CALCULATED

In the CBL, the vertical velocity variance or turbulence (F

2

wT) is profiled using an expressionbased on a mechanical or neutral stability limit (F

wm%u*) and a strongly convective limit (Fwc%

w*). The total vertical turbulence is given as:This form is similar to one introduced by Panofsky et al. (1977) and included in other dispersion

models (e.g., Berkowicz et al. (1986), Hanna and Paine (1989), and Weil (1988a)).

The convective portion (F

2

wc) of the total variance is calculated as:

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castellano: DISPER CUSTIC DESCAR RADIA italiano:

castellano: DIS CUS DES RAD english: DIS CUS DES RAD

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