A SIMPLE METHOD TO DETERMINE OBUKHOV LENGTHS FOR SUBURBAN AREAS

A simple scheme is presented to calculate Obukhov stability lengths L for suburban areas when measurements of sensible heat flux Q(H) or tem perature gradients are not available. The scheme replaces Q(H) with ch iQ, where Q* is net all-wave radiation, and chi = Q(H)/Q*, which is b ased on data collected in North American cities. The results suggest t hat the simple two-part model with either a variable or fixed value of chi for daytime works satisfactorily.