The Longitudinal Variation of Equatorial Waves due to Propagation on a Varying Zonal Flow
The Longitudinal Variation of Equatorial Waves due to Propagation on a Varying Zonal Flow
复制标题
变化纬向流传播引起的赤道波的纵向变化
DOI：
10.1175/jas-d-15-0167.1
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发表时间：
2016
影响因子：
3.1
通讯作者：
Hoskins B
中科院分区：
文献类型：
--
作者：
Hoskins B
本文从基本波动理论出发，发展了波在纬向变化流中传播的一般一维理论，导出了波数和能量沿沿着射线路径的变化方程。不同类别的行为被发现，这取决于组velocitycg的符号和波的属性B。对于B正，波能和波数的变化在同一意义上，最大值在相对东风或西风，取决于的符号cg。韦伯斯特和张的波积累也发生在g趋于零的地方。然而，对于B负，它们表现为相反的意义，波积累不会发生。利用该理论详细分析了最强赤道波的纬向传播。对于非色散开尔文波，B约为2，并且解析解是可能的。对于所有的波考虑，B是积极的，除了向西移动的混合Rossby重力波（WMRG），它可以有负B以及positiveB.Comparison的观测到的气候之间的个别赤道波和纯传播的结果的气候对流层上层流动。考虑到所作的近似，开尔文波分布是非常一致的。WMRG和Rossby波分布的某些方面也是定性一致的。然而，在东太平洋和大西洋冬季西风带中观测到的这些波的极大值通常与理论不雅阁。这是一致的，由于高纬度波活动在这些西风管道地区的赤道波源的重要性。
The general 1D theory of waves propagating on a zonally varying flow is developed from basic wave theory, and equations are derived for the variation of wavenumber and energy along ray paths. Different categories of behavior are found, depending on the sign of the group velocitycgand a wave propertyB. ForBpositive, the wave energy and the wavenumber vary in the same sense, with maxima in relative easterlies or westerlies, depending on the sign ofcg. Also the wave accumulation of Webster and Chang occurs wherecggoes to zero. However, forBnegative, they behave in opposite senses and wave accumulation does not occur. The zonal propagation of the gravest equatorial waves is analyzed in detail using the theory. For nondispersive Kelvin waves,Breduces to 2, and an analytic solution is possible. For all the waves considered,Bis positive, except for the westward-moving mixed Rossby–gravity (WMRG) wave, which can have negativeBas well as positiveB.Comparison is made between the observed climatologies of the individual equatorial waves and the result of pure propagation on the climatological upper-tropospheric flow. The Kelvin wave distribution is in remarkable agreement, considering the approximations made. Some aspects of the WMRG and Rossby wave distributions are also in qualitative agreement. However, the observed maxima in these waves in the winter westerlies in the eastern Pacific and Atlantic Oceans are generally not in accord with the theory. This is consistent with the importance of the sources of equatorial waves in these westerly duct regions due to higher-latitude wave activity.
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影响因子：
3.1
作者：
Yang G
通讯作者：
Yang G
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
J. Dias;G. Kiladis
通讯作者：
G. Kiladis
影响因子：
3.1
作者：
Yang G
通讯作者：
Yang G
QBO 相反相位的赤道波
影响因子：
3.1
作者：
Yang G
通讯作者：
Yang G