水平非均匀基流中行星波的传播  

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

作　　者：李艳杰[1,2] 李建平[1] 

机构地区：[1]中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100029 [2]中国科学院研究生院,北京100049

出　　处：《地球物理学报》2012年第2期361-371,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金重点项目(41030961);国家973计划项目(2010CB950400)共同资助

摘　　要：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30d,而东风中位相西传超长波的周期则小于30d.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.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.

关 键 词：行星波 非均匀基流 传播 周期 射线 

分 类 号：P433[天文地球—大气科学及气象学]