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易帆
,-0001,():
-1年11月30日
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易帆, S.-D. Zhang, F. Yi, J.-F. Wang
Ann. Geophysicae 18, 1316-1324 (2000),-0001,():
-1年11月30日
By amdyzing tile resutts of the numerical sinlulations ol nonlinear propagation of three Gaussian gravlly-wave packms in isothermal atmosphere individually, tile nonlinear effects on the characteristics of glavity waves are studied quantitatively. The analyses show that during the nonlinear propagation of gravity wave packets the mean fows are accelerated and the vertical wavelengths show clear reduction due to non-linearity 011 the other band, though nonlinear effects exist, the time variations of the fi'equencies of gravity wuve packets are close to those derived from the dispersion relation and the amplitude and phase relations of wave-associated disturbance components are consistent with the pledictions of the polarization rchttion of giavity waves. This indicates that the dispersion and polarization rehltions based on the linear grawty wave theory can be applied extensively in the nonlinear region
Meteorology and atmospheric dynamics (, middle atmosphere dynamics, waves and tides),
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【期刊论文】Sodium resonance lidar observations during 2001 Leonid meteor shower over Wuhan
易帆, LIU Jinbo, & YI Fan
Chinese Science Bulletin 2004 Vol. 49 No.3 303-306,-0001,():
-1年11月30日
Here is die first report on the observation of meteor ablation trails with tidar in China. Four long-lived Na ablation trails were el)served during the 18/19 Nov, 2001 Leonid meteor shower with a sodium resunance lidar over Wuhan. The Mean altitude of the 4 trails is 97.95kin. coaststeal with Leonid high entry velocity (-72kn/s). The peak deusit) averages about 3380
sodium resonance lidar,, Leonid shinier,, Na/, soditium laver
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