Some aspects of frequency and stability wind roses in a tropical region

Abstract

The frequency wind roses and stability wind roses based on meteorological data at Nairobi International Airport are calculated. The stability is estimated using a Pasquill-Gifford Scheme. The results show that in the tropics the winds have generally high speeds and are highly constant in direction throughout the year. The high wind speed in these regions has a great influence on the stability estimation scheme that is used.

The high wind speeds and persistence in the tropics are viewed as favorable factors in the air pollution problem since the dispersive ability of the atmosphere is enhanced and, in terms of long term planning, the wind variability is much less than is the case with middle latitudes.