MODEL FOR COEFFICIENTS OF TURBULENCE AND EFFECTIVE PRANDTL NUMBER PRODUCED BY BREAKING GRAVITY-WAVES IN THE UPPER-ATMOSPHERE

被引：20
|
作者：
GAVRILOV, NM [1 ]
YUDIN, VA [1 ]
机构：
[1] ST PETERSBURG HYDRO-METEOROL INST, ST PETERSBURG 199000, USSR
来源：
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 1992年 / 97卷 / D7期
关键词：
D O I：
10.1029/92JD00185
中图分类号：
P4 [大气科学（气象学）];
学科分类号：
0706 ; 070601 ;
摘要：
A mathematical model is developed for the calculation of turbulent characteristics within zones of wave-induced convective and dynamical instability. The model is based on the closure of spectral turbulent equations using a semiempirical hypothesis for the spectral characteristics of turbulence. Expressions are obtained for the mean values of coefficients of turbulent viscosity and heat conduction, evaluated over one period of the internal gravity wave (IGW). Evaluations are made of typical effective turbulent Prandtl numbers for the inhomogeneous turbulence which is produced by breaking saturated and nonsaturated IGW in the middle and upper atmosphere.
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页码：7619 / 7624
页数：6
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