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     The meteorological preprocessor program, RAMMET, used by the ISC Short Term model uses an interpolation scheme to assign hourly rural and urban mixing heights on the basis of the early morning and afternoon mixing heights calculated using the Holzworth (1972) procedures.  The procedures used to interpolate hourly mixing heights in urban and rural areas are illustrated in Figure 1‑4, where:

      Hm{max} =maximum mixing height on a given day

      Hm{min} = minimum mixing height on a given day

           MN = midnight

           SR = sunrise

           SS = sunset

The interpolation procedures are functions of the stability category for the hour before sunrise.  If the hour before sunrise is neutral, the mixing heights that apply are indicated by the dashed lines labeled neutral in Figure 1‑4.  If the hour before sunrise is stable, the mixing heights that apply are indicated by the dashed lines labeled stable.  It should be pointed out that there is a discontinuity in the rural mixing height at sunrise if the preceding hour is stable.  As explained above, because of uncertainties about the applicability of Holzworth mixing heights during periods of E and F stability, the ISC models ignore the interpolated mixing heights for E and F stability, and treat such cases as having unlimited vertical mixing.

 

 

 

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

 

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