Influence of a Mean Shear on the Dynamical Instability of an Inertio–Gravity Wave

Influence of a Mean Shear on the Dynamical Instability of an Inertio–Gravity Wave
复制标题

平均剪切对惯性重力波动态不稳定性的影响

DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
D. Fritts
D. Fritts
中科院分区：
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文献类型：
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作者：
Li Yuan;D. Fritts

文献摘要

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摘要利用线性理论研究了平均切变对大振幅重力惯性波动力不稳定性的影响。平均切变的强度和方向以及IGW的频率都影响着动力不稳定的发生和特征。中性曲线和增长率的不稳定性计算来检查这种依赖性。所得结果表明，IGW可以支持动力学不稳定性ova更广泛的频率范围和更大的增长率的存在下，一个平均片。
Abstract Linear theory is used to examine the influence of a mean shear on the dynamical instability of a large-amplitude inertio-gravity wave (IGW). The strength and orientation of the mean shear and the frequency of the IGW are all found to influence the occurrence and characteristics of the dynamical instability. Neutral curves and growth rates of the instability are computed to examine this dependence. The results obtained suggest that an IGW may support dynamical instability ova a wider range of frequencies and with larger growth rates in the presence of a mean sheet.