NUMERICAL SIMULATIONS OF THE SATURATED GRAVITY-WAVE SPECTRA IN THE ATMOSPHERE

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题名:	NUMERICAL SIMULATIONS OF THE SATURATED GRAVITY-WAVE SPECTRA IN THE ATMOSPHERE
作者:	HUANG,CM;KUO,FS;LUE,HY;LIU,CH
贡献者:	物理研究所
关键词:	UNIVERSAL SPECTRUM;MOMENTUM FLUXES;MST RADAR;TURBULENCE;STRATOSPHERE;AUSTRALIA;ADELAIDE
日期:	1992
上传时间:	2010-07-08 14:13:16 (UTC+8)
出版者:	中央大學
摘要:	A two dimensional numerical model is used to compute the saturation of small scale gravity waves in the region near the critical level. The vertical wave number spectrum of horizontal velocity fluctuations in the unstable region (USR) where shear instability develops is found to be governed by wave-shear interaction and follows a theoretical saturation spectrum approximately omega(b)2/2m3. Wave-shear interaction is also found to be responsible for the observed fact that the variance of vertical velocity fluctuations is significantly lower than the level predicted by linear gravity wave theory. On the other hand, the corresponding spectrum in the stable region (SR) following a much shallower spectrum approximately m-2 is found to result from the combined effects of wave-wave interactions and eddy diffusion. The key step in our simulation is the separate parameterization of horizontal and vertical eddy diffusion coefficients instead of a constant molecular viscosity coefficient.
關聯:	JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS
显示于类别:	[物理研究所] 期刊論文

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