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期刊论文

A numerical study on global propagations and amoplitude growths of large-scale gravity wave packets

易帆Shaodong Zhang and Fan Yi

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 109, D07106,-0001,():

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摘要/描述

By using a full-implicit-continuous-Eulerian (FICE) scheme and taking a set of basic atmospheric motion equations in spherical coordinates as governing equations, z fully nonlinear numerical model for the dynamics of the middle and upper atmosphere is established to numerically study the nonlinear global propagations and amplitude growths of large-scale gravity wave packets. The simulation results show that the newly established model can successfully exhibit the essential characteristics of the global propagations of gravity waves: wave energies propagate upward along the ray paths derived from the hnear gravity wave theory, and wave disturbance amplitudes increase with the increasing heights. During the upward propagation of gravity wave packets, there occurs evident enhancement of background wind along the propagation direction. Moreover, our simulation demonstrates that Earth rotation has little influences on the wave energy propagations and amplitude growths. However, the primary nonlinear curvature terms (uvr tan0 and -u2r tan0) play an important role in the growths of gravity wave amplitudes, which causes a evident latitudinal dependence of wave amplitude growth. In the Northern Hemisphere, with the same spatial scales and initial zonal dislurbance amplitudes, the waves propagating in lower-latitude regions have larger disturbance amplitudes.

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版权说明:以下全部内容由易帆上传于   2005年10月12日 22时37分50秒,版权归本人所有。

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