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Nonlinear interactions between gravity waves with different wavelengths and diurnal tide
Liu X(刘晓); Xu JY(徐寄遥); Liu, H. L.; Ma RP(马瑞平); 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJournal of Geophysical Research-Atmospheres
2008
Volume113Issue:D8Pages:D08112
ISSN0148-0227
Language英语
KeywordMiddle Atmosphere Lower Thermosphere Mesopause Region Mean State Model Mesosphere Turbulence Propagation Dynamics Breaking
AbstractBy using a compressible nonlinear two-dimensional gravity wave model, we simulate the nonlinear interactions between gravity waves (GWs) with three different vertical wavelengths and a meridional component of the diurnal tidal wind and temperature (30 degrees N, September) calculated from GSWM-00. We also compare the results with the simulation of GWs propagation in a background with zero wind. Consistent with the dispersion relation, the numerical experiments show that tidal wind reduces the vertical wavelengths of the GWs when it is in the same direction as the wave propagation, and thus increases the perturbative shear and the likelihood of instability and wave breaking, especially for waves with shorter vertical wavelengths. The breaking of GWs below the critical level can increase the amplitude of diurnal tidal wind due to the momentum deposition. Because the GW penetration height increases with vertical wavelength, the amplitude of diurnal tidal wave at higher altitudes is more likely to be affected by GWs with large vertical wavelengths. Therefore gravity wave breaking not only accelerates the mean winds, but also increases the amplitudes of the diurnal tide at various altitudes.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1120
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Liu X,Xu JY,Liu, H. L.,et al. Nonlinear interactions between gravity waves with different wavelengths and diurnal tide[J]. Journal of Geophysical Research-Atmospheres,2008,113(D8):D08112.
APA 刘晓,徐寄遥,Liu, H. L.,马瑞平,&北京8701信箱.(2008).Nonlinear interactions between gravity waves with different wavelengths and diurnal tide.Journal of Geophysical Research-Atmospheres,113(D8),D08112.
MLA 刘晓,et al."Nonlinear interactions between gravity waves with different wavelengths and diurnal tide".Journal of Geophysical Research-Atmospheres 113.D8(2008):D08112.
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