| Seasonal Variation of Stationary and Low-Frequency Rossby Wave Rays |
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| 作者姓名： | Lu Keli Zhu Yongchun |
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| 作者单位： | Department of Atmospheric Sciences，Nanjing University，Nanjing 210008，Department of Atmospheric Sciences，Nanjing University，Nanjing 210008 |
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| 摘 要： | The wave rays and their seasonal variation of stationary and low－frequency Rossby waves are studied by using the Runge-Kutta scheme. The results show that for stationary waves the rays can reach lower latitudes in winter, and are limited in higher latitudes in summer. The main differences between the stationary and low-frequency wave rays are that low-frequency waves can propagate across the equator and the easterlies will not be an obstacle on their propagation. It explained to some extent the interaction of disturbances between the Northern and Southern Hemi-spheres. The lower wave frequencies and the stronger easterly flow are, the more difficult low-frequency waves will be to propagate across the equator. The waves with 20-day period are easier to propagate across the equator than that with 50-day period. The winter is the most favorable season for low-frequency waves to propagate into another hem-isphere.
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Seasonal Variation of Stationary and Low-Frequency Rossby Wave Rays |
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| Lu Keli,Zhu Yongchun.Seasonal Variation of Stationary and Low-Frequency Rossby Wave Rays[J].Advances in Atmospheric Sciences,1994,11(4):427-435. |
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| Authors: | Lu Keli and Zhu Yongchun |
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| Institution: | Department of Atmospheric Sciences, Nanjing University, Nanjing 210008,Department of Atmospheric Sciences, Nanjing University, Nanjing 210008 |
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| Abstract: | The wave rays and their seasonal variation of stationary and low-frequency Rossby waves are studied by using the Runge-Kutta scheme. The results show that for stationary waves the rays can reach lower latitudes in winter, and are limited in higher latitudes in summer. The main differences between the stationary and low-frequency wave rays are that low-frequency waves can propagate across the equator and the easterlies will not be an obstacle on their propagation. It explained to some extent the interaction of disturbances between the Northern and Southern Hemispheres. The lower wave frequencies and the stronger easterly flow are, the more difficult low-frequency waves will be to propagate across the equator. The waves with 20-day period are easier to propagate across the equator than that with 50-day period. The winter is the most favorable season for low-frequency waves to propagate into another hemisphere. |
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| Keywords: | Ray Propagation Teleconnection Low-frequency wave |
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