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 LT, and the vertical velocity fluctuation method, which calculates the turbulence parameters on the basis of vertical velocity data and their fluctuations σW. 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.
LIU Xiao
,
WANG Yuting
. Comparative study of turbulence parameter calculation based on Thorpe analysis and vertical velocity fluctuation method[J]. Science & Technology Review, 2015
, 33(24)
: 92
-97
.
DOI: 10.3981/j.issn.1000-7857.2015.24.015
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