| LAGRANGIAN METHOD USED IN THE RESEARCH OF ATMOSPHERIC CIRCULATION |
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| 作者姓名： | 陆汉城 雷兆崇 |
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| 作者单位： | Nanjing Institute of Meteorology Nanjing and C.N.Duncan University of Edingburgh，U.K.，Nanjing Institute of Meteorology，Nanjing and C.N.Duncan University of Edingburgh，U.K. |
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| 基金项目： | Natural Environment Research Council(NERC)U.K. |
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| 摘 要： | Based on the conservation of entropy and potential vorticity in adiabatic atmospheric motion without theconsideration of friction,calculation is made of the trajectory of a particle on an isentropic surface by use ofthe data of FGGE III-b.Results of several calculation schemes of the trajectory discussed show that thelocal data interpolation and Runge-Kutta time-integral scheme is the best.The calculated trajectory reflectsthe large-scale atmospheric motion only and the small-scale motion emerges as a deviation term of thecalculated trajectory.And then the outbreak and propagation of planetary wave are studied by means ofthe deformation of a material line,with the result showing that the material line can be tracked in the trop-osphere only in a few days,beyond which the interaction between the small-scale waves and large-scale motionleads to its dramatical twisting and deformation.Therefore,the Lagrangian method is assumed to be an effectivemeans of diagnostic research in the nonlinear interaction in atmospheric circulation,in addition to the generalstudy of the atmospheric circulation.
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LAGRANGIAN METHOD USED IN THE RESEARCH OF ATMOSPHERIC CIRCULATION |
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| Lu Hancheng Lei Zhaochong Nanjing Institute of Meteorology,Nanjing and C.N.Duncan University of Edingburgh,U.K..LAGRANGIAN METHOD USED IN THE RESEARCH OF ATMOSPHERIC CIRCULATION[J].Acta Meteorologica Sinica,1991(2). |
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| Authors: | Lu Hancheng Lei Zhaochong Nanjing Institute of Meteorology Nanjing and CNDuncan University of Edingburgh UK |
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| Abstract: | Based on the conservation of entropy and potential vorticity in adiabatic atmospheric motion without the consideration of friction,calculation is made of the trajectory of a particle on an isentropic surface by use of the data of FGGE III-b.Results of several calculation schemes of the trajectory discussed show that the local data interpolation and Runge-Kutta time-integral scheme is the best.The calculated trajectory reflects the large-scale atmospheric motion only and the small-scale motion emerges as a deviation term of the calculated trajectory.And then the outbreak and propagation of planetary wave are studied by means of the deformation of a material line,with the result showing that the material line can be tracked in the trop- osphere only in a few days,beyond which the interaction between the small-scale waves and large-scale motion leads to its dramatical twisting and deformation.Therefore,the Lagrangian method is assumed to be an effective means of diagnostic research in the nonlinear intcraction in atmospheric circulation,in addition to the general study of the atmospheric circulation. |
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| Keywords: | lagrangian method trajectory material line surf zone outbreak |
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