ON OTHER WAVE GUIDE IN STATIONARY PLANETARY WAVE PROPAGATIONS IN WINTER NORTHERN HEMISPHERE
ON OTHER WAVE GUIDE IN STATIONARY PLANETARY WAVE PROPAGATIONS IN WINTER NORTHERN HEMISPHERE
复制标题
DOI：
10.1360/yb1984-27-6-610
复制
发表时间：
1984-06
影响因子：
9.6
通讯作者：
Huang Ronghui;K. Gambo
中科院分区：
文献类型：
--
作者：
Huang Ronghui;K. Gambo
本文从理论上计算了等温大气中静止行星波的折射率平方。在冬季静止行星波的垂直和横向传播中，除了极波外，还应存在从中高纬度对流层下层指向低纬度对流层上层的另一条波导。在球坐标系中，采用准地转稳态34层模型，考虑瑞利摩擦、牛顿冷却效应和水平运动热扩散系数，研究了静止行星波对理想强迫机制（如理想地形或北半球固定热源）响应的垂直和横向传播。计算结果证实了行星波在冬季平稳传播中确实存在另一条波导。利用该模式计算了在实际半球地形和固定热源的强迫作用下，静止行星波的振幅和相位的垂直分布以及在等压面上的静止扰动模式。计算结果解释了由于另一个波导的存在，响应地形和固定热源强迫的平稳行星波可以在低纬度向对流层上层传播。这可能是冬季副热带上空形成静止扰动型的原因之一。
In this paper, the refractive index squared of stationary planetary waves in the isothermal atmosphere is computed theoretically. It has been discovered that there should be the other wave guide pointing from the lower troposphere in middle and high latitudes toward the upper troposphere in low latitudes in addition to the polar wave guide in the vertical and lateral pro- pagations of stationary planetary waves in winter. The vertical and lateral propagations of stationary planetary waves responding to an idealiz- ed forcing mechanism, for example, an idealized topography or stationary heat sources over the Northern Hemisphere have been investigated by means of a quasigeostrophic, steady-state, 34-level model with Rayleigh friction, Newtonian cooling effect and the horizontal kinematic thermal diffusivity included in a spherical coordinate system. The computed results have veri- fied that there actually is the other wave guide in the stationary planetary wave propagations in winter. The vertical distributions of amplitude and phase of stationary planetary waves and the stationary disturbance pattern at the isobaric surfaces responding to forcing by the actual hemispheric topography and stationary heat sources in winter have been computed by using this model. The computed results have explained that due to the other wave guide, stationary planetary waves responding to forcing by topography and stationary heat sources can be pro- pagated toward the upper troposphere in low latitudes. This may be one of the reasons for the formation of stationary disturbance pattern over the subtropics in winter.