| 时间平均基流中准定常波的传播及多向折射 |
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| 引用本文： | 郭品文,徐建军.时间平均基流中准定常波的传播及多向折射[J].南京气象学院学报,1996,19(4):439-444. |
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| 作者姓名： | 郭品文 徐建军 |
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| 作者单位： | 南京气象学院气象学系 |
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| 摘 要： | 应用几何光学中的射线理论，直观地讨论了准定常波在时间平均基流中的传播，解释了定常 传播的纬向非均匀性。结果表明：折射指数平方可表示为基流绝对对基流流函数的微商，定常波的传播路径与折射指数平方的空间分布有着密切的关系。
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| 关 键 词： | 准定常波 时间平均基流 多向折射 大气环流 |
PROPAGATION OF QUASI STATIONARY WAVES IN TEMPORAL MEAN FLOW WITH ITS MULTI BRANCH REFRACTION |
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| Guo Pinwen,Xu Jianjun.PROPAGATION OF QUASI STATIONARY WAVES IN TEMPORAL MEAN FLOW WITH ITS MULTI BRANCH REFRACTION[J].Journal of Nanjing Institute of Meteorology,1996,19(4):439-444. |
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| Authors: | Guo Pinwen Xu Jianjun |
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| Abstract: | The ray theory of geometric optics was applied to visually investigate the propagation of quasi stationary waves in time mean basic flow and interpret the zonal nonhomogeneity. It turns out that squared refraction index (SRI) can be expressed as the derivative of the absolute vorticity with respect to the streamefunction for such a flow and the path is closely related to the spatial pattern of the SRI. The ray has a tendency to travel to a region of maximum SRI (SRI 1) and is difficult to propagate when meeting with a region of minimum SRI (SRI 2). And further analysis shows that the ray, when projecting onto SRI 2 nonperpenticularly (vertically), experiences uni branch (multi branch) refraction. Eventually, the 500 hPa SRI pattern was examined in virtue of measurements, indicating that the scheme can well explain the propagation and multi branch refraction of quasi stationary wave in the real atmosphere. |
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| Keywords: | quasi stationary wave temporal mean basic flow refraction index multi branch refraction |
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