On the basis of the high resolution wind and temperature data observed by the radiosound on the Kexue #1 scientific observation ship during SCSMEX (South China Sea Monsoon Experiment) in 1998 (May 5-25, June 5-25), the turbulence parameters (kinetic energy dissipation rate ε and turbulence diffusivity K) in the troposphere and lower stratosphere (TLS) are derived using the following two methods: Thorpe analysis, which calculates the turbulence parameters on the basis of the temperature data and Thorpe length L_T, and the vertical velocity fluctuation method, which calculates the turbulence parameters on the basis of vertical velocity data and their fluctuations σ_W. The results from the two methods exhibit similarities in terms of the vertical structure and magnitudes of ε and K. In the respect of vertical structures, ε and K are relatively large above 10 km and below the tropopause (~17-18 km), no matter the averaged results are on a monthly or daily basis. By contrast, they are relatively small above the tropopause. The peak values of K derived using the two methods are both at around 15 km. The magnitudes of ε and K calculated using the two methods are both in the range of 10-6-10-2 m²·s^-3 for ε and 0-10 m²·s^-1 for K. The differences of the results from the two methods are that the turbulence parameters calculated by the vertical velocity fluctuation method are smaller than those by Thorpe analysis; the peak value of ε is at about 15 km according to Thorpe analysis, but at about 17 km according to the vertical velocity fluctuation method.

vertical rising velocity fluctuation  /  turbulence kinetic energy dissipation rate  /  turbulence diffusivity