Dissipation rates of turbulent kinetic energy and temperature and humidityvariances over different surfaces

Dissipation rates of turbulent kinetic energy, and temperature and humidity variances have been analyzed using turbulent data collected from the Gobi desert, grassland, and suburban and urban sites that have different physica l conditions. instrumentation was installed at heights of 4.9 m, 3.45 m, 75 m and 47 m over the Gobi desert, grassland, and suburban and urban sites, respectively, The dimensionless dissipation rates of turbulent phi(epsilon) , kinetic energy, temperature variance phi(N), and humidity variance phi(ga mma) are found to be more than 20% less than that required to balance the p roduction of energy by wind shear and the variances by temperature and humi dity gradients. The deficits appear to increase with the increase of absolu te stability parameter. Combining the results from previous and present stu dies, the non-dimensional dissipation rates of turbulent kinetic energy, an d temperature and humidity variances are modified by using the stability pa rameter. (C) 1999 Elsevier Science B.V. All rights reserved.