摘要
本文根据Whitham和Lighthill等人的射线理论,研究了具有非均匀层结和流场切变的大气中惯性重力内波的传播和折射问题。定义了一个由背景场参数N^2(静力稳定度)、(惯性稳定度)和(与斜压稳定性有关)的梯度组合而成的所谓“环境稳定度”矢量,它对重力波的折射有决定性的作用。结果表明:局地波导方向垂直于矢量;稳定度中心之间的过渡地带沿稳定度等值线方向为波能传播的有利通道。
The characteristics of the refraction of inertial gravity waves in the atmosphere with non uniform stratification and shearing basic flow have been studied in this paper based on Whitham's ray theory. A so-called environmental stability vector ?which is of crucial importance to the refraction of the gravity waves has been defined. It is the combination of the gradients of the environmental parameters : N2 (static stability) ,ζa (inertial stability) and Uz (related to che baroclinic stability of the basic flow). The results show that the local wave energy guide is oriented to a direction normal to the vector E. Regions of transition from a center of stability (stable or unstable) to another are the favorable passageway for the gravity wave energy.
出处
《热带气象》
CSCD
1991年第1期1-7,共7页
