水平非均匀基流中行星波的传播

行星波传播理论虽然已有很多研究,但是大多以纬向对称基流为主,无法解释东西风带之间相互作用的事实.鉴于此,本文从理论上系统讨论了纬向对称和水平非均匀基流中定常和非定常波动的传播特征.首先,对纬向对称基流中波动传播的周期特征进行分析后发现,西风中位相东传超长波周期大于30 d,而东风中位相西传超长波的周期则小于30 d.之后,从传播的空间以及周期特征等方面系统研究了水平非均匀基流中球面波动传播理论,得到以下结论:经向基流使得定常波可以穿越东风带,在南北两半球间传播,为东西风带之间的相互作用提供了理论解释;强的经向流使得波动传播具有单向性;亚澳季风区低层纬向1波呈低频特征.

Propagation of planetary waves in the horizontal non-uniform basic flow

Although the planetary wave propagation has been studied a lot,most of them were based on the zonal symmetric basic flow which can′t explain the interactions between westerlies and easterlies.For this reason,the characteristics of stationary and non-stationary wave propagation in the zonal symmetric and horizontal non-uniform basic flow are researched systematically in theory.After analyses of the periodic characteristics of wave propagation in zonal symmetric flow,it is concluded that the period of the ultra-long waves with eastward phase propagation in westerlies and that with westward phase propagation in easterlies is respectively more and less than 30 days.And then the spherical wave propagation in horizontal non-uniform basic flow is theorized from the aspects of the spatial and periodic characteristics of propagation.Some interesting results are as follows.Stationary waves can propagate through the easterlies with a weak meridional wind,so the interactions between the Northern and Southern Hemisphere can be turned out in the view of planetary waves.The direction of propagation is one-way with strong meridional flow.Zonal wavenumber one wave displays low-frequency feature in low levels over the Asian-Australian monsoon region.