3.3.2 SENSIBLE HEAT FLUX (H) IN THE SBL

Having computed u* and 2

* for stable conditions, AERMET calculates the surface heat flux

from eq. (10) as

AERMET limits the amount of heat that can be lost by the underlying surface to 64 W m-2. This

value is based on a restriction that Hanna (1986) placed on the product of 2

* and u*. That is, for

typical conditions Hanna found that

When the heat flux, calculated from eq. (20), is such that 2

* u* > 0.05 m s-1 K, AERMET

recalculates u* by substituting 0.05/u* into eq. (15) for 2

* (uo in eq. (15) is a function of 2

* ).

3.3.3 MONIN OBUKHOV LENGTH (L) IN THE SBL

Using the sensible heat flux of eq.(20) and u* from eq. (15), the Monin-Obukhov Length, for

the SBL is calculated from eq. (8).

3.4 Mixing Height

The mixing height (zi) in the CBL depends on both mechanical and convective processes and

is assumed to be the larger of a mechanical mixing height (zim) and a convective mixing height

(zic). Whereas, in the SBL, the mixing height results exclusively from mechanical (or shear

induced) turbulence and therefore is identically equal to zim. The same expression for calculating

zim is used in both the CBL and the SBL. The following two sections describe the procedures

used to estimate zic and zim, respectively.

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