Using the mesosphere-stratosphere-troposphere (MST)radar observations in the troposphere and lower stratosphere at a tropicalstation, Gadanki, the rate of turbulent kinetic energy dissipation ε,as estimated by the spectral width method, the power method, and the variancemethod, has been compared. It is found that ε from the spectral widthmethod and variance method agree quite well under low background wind conditions,whereas under high background wind conditions, ε from the spectral widthmethod appears to be an underestimate. The ε from the power method isgenerally lower than that from the other two methods. Adopting the variancemethod, the turbulence parameters ε and the eddy diffusivity for momentum Km have beenestimated for tropospheric and lower stratospheric regions over Gadanki forthe period 18 January 1999 to 5 March 1999, making use of the vertical windobservations from MST radar on each night for ~2 hours. Average altitudeprofiles of ε and Kmfor the winter season are presented. The turbulence parameter profiles reveala prominent peak in the upper troposphere. From Richardson number considerationsthe observed turbulence is attributed mainly to wind shear.