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| A THEORETICAL STUDY ON THE MULTIPLE EQUILIBRIA OF TROPICAL ATMOSPHERE AND THEIR RELATION TO THE ONSET OF THE SUMMER MONSOON | |
| 作者姓名： | 赵南 丁一汇 高桥正明 沈新勇 |
| 作者单位： | LaSW, Chinese Academy of Meteorological Sciences;National Climate Center;Center for Climate System Research, University of Tokyo;Nanjing University of Information Science and Technology |
| 基金项目： | National Natural Science Foundation of China (40275011; 40545019); South China Sea Monsoon Experiment project |
| 摘 要： | Multiple equilibria and their stability in tropical atmosphere are investigated through β-plane
barotropic models with consideration of heating and dissipation. We have derived the solutions of the model
equations corresponding to the multiple equilibria or the steady flows first, and then establish the criteria for the stability of steady flow by use of the Liapunov direct Method. When these criteria are applied to the solutions of equilibria obtained, stable flows, which are closely related to the different patterns of quasi-stationary circulation in the tropical region, are found. The configurations of these stable flows and the shift between two of them as season changes provide quite reasonable explanations to many fundamental problems of tropical circulation features such as the catastrophe mechanism of the onset and the break-active cycle of the Asian summer
monsoon. It follows that the onset or the abrupt transition of the Asian summer monsoon could be attributed to
the multiple equilibrium property of the tropical circulation resulted from the advective nonlinearity, which
provide another explanation among others. |
| 关 键 词： | tropical atmosphere multiple equilibria abrupt transition Asian summer monsoon |
A THEORETICAL STUDY ON THE MULTIPLE EQUILIBRIA OF TROPICAL ATMOSPHERE AND THEIR RELATION TO THE ONSET OF THE SUMMER MONSOON |
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| ZHAO Nan,DING Yi-hui,Masaaki Takahashi and SHEN Xin-yong.A THEORETICAL STUDY ON THE MULTIPLE EQUILIBRIA OF TROPICAL ATMOSPHERE AND THEIR RELATION TO THE ONSET OF THE SUMMER MONSOON[J].Journal of Tropical Meteorology,2006,12(2):130-138. | |
| Authors: | ZHAO Nan DING Yi-hui Masaaki Takahashi and SHEN Xin-yong |
| Institution: | 1. LaSW, Chinese Academy of Meteorological Sciences, Beijing 100081 China 2. National Climate Center, Beijing 100081 China 3. Center for Climate System Research, University of Tokyo, Tokyo, Japan 4. Nanjing University of Information Science and Technology, 210044 Nanjing China |
| Abstract: | Multiple equilibria and their stability in tropical atmosphere are investigated through β -plane barotropic models with consideration of heating and dissipation. We have derived the solutions of the model equations corresponding to the multiple equilibria or the steady flows first, and then establish the criteria for the stability of steady flow by use of the Liapunov direct Method. When these criteria are applied to the solutions of equilibria obtained, stable flows, which are closely related to the different patterns of quasi-stationary circulation in the tropical region, are found. The configurations of these stable flows and the shift between two of them as season changes provide quite reasonable explanations to many fundamental problems of tropical circulation features such as the catastrophe mechanism of the onset and the break-active cycle of the Asian summer monsoon. It follows that the onset or the abrupt transition of the Asian summer monsoon could be attributed to the multiple equilibrium property of the tropical circulation resulted from the advective nonlinearity, which provide another explanation among others. |
| Keywords: | tropical atmosphere multiple equilibria abrupt transition Asian summer monsoon |
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