| STUDY OF THE NONLINEAR MECHANISM ABOUT THE FORMATION OF BLOCKING HIGH* |
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| 作者姓名： | ZHENG Zuguang LI Xiuling LIU Lihong WU Hong |
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| 作者单位： | China Meteorological Administration Training Center, Beijing 100081;China Meteorological Administration Training Center, Beijing 100081;China Meteorological Administration Training Center, Beijing 100081;China Meteorological Administration Training Center, Beijing 100081 |
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| 基金项目： | * supported by the National Natural Science Foundation of China (49875018) |
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| 摘 要： | In this paper,a nonlinear dynamical system considering the interactions among ultra-long wave,long wave and zonal flow in a baroelinic atmosphere was found.In this system,thermal forcing and frictional dissipation are regarded as the external parameters.The procedure,in which the maps of orbit in phase space,contour of stream function and section of Poincaré mapping are combined with each other,is used to determine the distributions of system states and circulation patterns and to draw the corresponding diagrams.The results show that by using the Galerkin method,there is no essential influence of the increasing of orders of truncated-spectrum in a certain range on the distributions of system states and circulation patterns,but it makes them somewhat complexities.By contrast,the changing of distribution of thermal forcing exerts a great influence on the system.Blocking high links closely with the oscillating of the atmospheric circulation and the meridional growing intensely,while the development of synoptic wave can promote the oscillating.
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| 关 键 词： | dynamical system thermal forcing friction dissipation blocking high nonlinearity |
| 收稿时间： | 2004/6/14 0:00:00 |
STUDY OF THE NONLINEAR MECHANISM ABOUT THE FORMATION OF BLOCKING HIGH* |
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| ZHENG Zuguang,LI Xiuling,LIU Lihong,WU Hong.STUDY OF THE NONLINEAR MECHANISM ABOUT THE FORMATION OF BLOCKING HIGH*[J].Acta Meteorologica Sinica,2004,18(4):423-440. |
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| Authors: | ZHENG Zuguang LI Xiuling LIU Lihong and WU Hong |
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| Institution: | China Meteorological Administration Training Center, Beijing 100081;China Meteorological Administration Training Center, Beijing 100081;China Meteorological Administration Training Center, Beijing 100081;China Meteorological Administration Training Center, Beijing 100081 |
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| Abstract: | In this paper,a nonlinear dynamical system considering the interactions among ultra-long wave,long wave and zonal flow in a baroelinic atmosphere was found.In this system,thermal forcing and frictional dissipation are regarded as the external parameters.The procedure,in which the maps of orbit in phase space,contour of stream function and section of Poincaré mapping are combined with each other,is used to determine the distributions of system states and circulation patterns and to draw the corresponding diagrams.The results show that by using the Galerkin method,there is no essential influence of the increasing of orders of truncated-spectrum in a certain range on the distributions of system states and circulation patterns,but it makes them somewhat complexities.By contrast,the changing of distribution of thermal forcing exerts a great influence on the system.Blocking high links closely with the oscillating of the atmospheric circulation and the meridional growing intensely,while the development of synoptic wave can promote the oscillating. |
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| Keywords: | dynamical system thermal forcing friction dissipation blocking high nonlinearity |
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