Monin-Obukhov length, L | AIChE

Monin-Obukhov length, L

Accounts for the effects of stability and is proportional to u*3 divided by the surface turbulent heat flux, Hs, to or from the ground surface: L= -(u*3/k)/(gHs /cp ρ T), where g = 9.8 m/s2 is the acceleration of gravity, cp = 1005 J kg-1K-1 is the specific heat of air at constant pressure, and T is the air temperature (in K). The friction velocity, u*, in this formula is based on the surface stress, to. Hs (in Watts/m2 is positive during the day and negative at night.

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