波射线变形及其影响因子的探讨

A STUDY ON DEFORMATIONS OF RAY AND ITS RELEVANT FACTORS

中文摘要:

      本文采用简化数学模型,定性分析了科氏参数、西风廓线、大地形结构一阶与二阶经向变率(即(d²f/dy²),u″,h_s″)对于波射线路径影响问题。本文研究表明,上述影响因素的二阶经向变率的存在条件对于“大圆路径”形成起了重要作用。类似实际大气西风廓线特征可能导致波射线呈“正弦波型”路径。本文还讨论了西风切变、β因子、大地形坡度对于波射线“大圆半径”尺度、波射线“转向点”以及遥相关波列扰动振幅的影响。另外,本文探讨了拦截波临界风速廓线特征。

英文摘要:

      In this paper,the effects of first and second meridional derivative of Coliolis parameter,west wind and topography profiles(i.e.d²f/dy²),u″,h_s″) on ray routes are qualitatively analysed by the use of a simplified mathematical model. The analysis indicates that the conditions of second derivative of the above relevant factors play an important role in the formation of great circle route. A profile of west wind similar with the real atmosphere may result in a "sine wave pattern" of ray. The effects of the shear of west wind,β factor and the slope of topography on the scale of radius of great circle, critical latitude of rays and the amplitude of wave train of teleconnexion are also discussed. Additionally, the characters of critical velocity profile for meridionally trapped wave are discussed.