| 摘要: |
| (1)利用大气对流层中部无辐散层的存在,垂直积分热力学方程,并对整个对流层的距平加热场作解析近似的描写,联立涡度方程,得到了非绝热准地转的250 hPa距平流函数方程。它的形式酷似正压涡度方程。(2)讨论了罗斯贝波列的谱平均相速和群速。证明了气候平均高度场的闭合中心,就是中高纬度大气低频振子。其两侧位相变化相反,它的能源主要来自CISK凝结正反馈或海温的感热。(3)导出了低频遥相关射线公式,它表明低频射线在偏北风中向南穿越流线;在偏南风中向北穿过流线;在槽底或脊顶附近转向。这些理论结果比大圆理论更合理地解释北半球的观测到的低频遥相关。 |
| 关键词: 低频遥相关 水平传播 射线公式 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金 |
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| A ANALYTIC STUDY ON THE MECHANISM FOR LOW FREQUENCY TELECONNECTION AND HORIZONTAL PROPAGATION IN ATMOSPHERE |
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Xue fanbing
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Zhongshan University, Dept of Atmosphere Science, Guangzhou, 510275
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| Abstract: |
| With the consideration of characteristics of spectral average of the Rossby wave trains and the adoption of climate mean stream field, it can be proved that atmospheric action centers are low frequency oscillator with dipole structure, and that energy of low frequency oscillation originates from condensation heating and ocean heating It can deduced that the wave ray will move southward across the streamline in the mean wind field with south component or northward across the streamline in the mean wind with north component The switch of propagation takes place near the bottom of trough or the top of ridge A reasonable explanation can be given to the location of main teleconnection dipole and paths in the North Hemisphere at 250 hPa |
| Key words: Low frequence teleconnection Horizontal propogation Deduction of wave ray |
