Based on the planetary boundary layer data measured by an observation system fixed on an observation tower in Dali from March to December 2007,the characteristics of turbulence intensity,standard deviation,turbulence flux and drag coefficient were analyzed by using the eddy correlation method.The results show that turbulence intensity in the dry season was much higher than that in the wet season.The dimensionless standard deviations of 3D winds followed a z/L power law with an exponent of 1/3.The dependence...