| 不同形状初始涡旋和热力强迫能量频散特征的数值研究 |
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| 引用本文： | 杨舵,余晖.不同形状初始涡旋和热力强迫能量频散特征的数值研究[J].南京气象学院学报,1997,20(2):224-230. |
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| 作者姓名： | 杨舵 余晖 |
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| 作者单位： | 南京气象学院应用气象学系 |
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| 摘 要： | 用谱方法求解球面无辐散正压涡度方程，讨论了不同形状初始涡旋和热力强迫能量频散特性的差异。结果表明：１．在不同结构的环境风场下，差异是没的。环境风场为零或西风时，不不形状的初始涡旋或热力强迫能量频散方向，１速度，强度的差异均较大，但在半球模式中经向频散均很小，能量以向东传播为主。有东风风场存在时，只表现为频散强度的差异，且向极传播的波形波长较长，向南传播的波列波长较短。２．以上线性结果中用波射线跟踪
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| 关 键 词： | 初始涡旋 热力强迫 能量频散 涡旋 气流 |
THE NUMERICAL RESEARCH ON THE NATURES OF ENERGY DISPERSION OF INITIAL VORTICES AND THERMAL FORCINGS IN VARIOUS SHAPES |
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| Yang Duo,Yu Hui.THE NUMERICAL RESEARCH ON THE NATURES OF ENERGY DISPERSION OF INITIAL VORTICES AND THERMAL FORCINGS IN VARIOUS SHAPES[J].Journal of Nanjing Institute of Meteorology,1997,20(2):224-230. |
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| Authors: | Yang Duo Yu Hui |
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| Abstract: | A nondivergent barotropic vorticity equation on the sphere is solved by the spectral method (T42) to examine the differences of the nature of energy dipersion of initial vortices and thermal forcings in various shapes. The results show that the differences vary with the structures of zonal flows. When the zonal flows are zero or westerly, the differeces in the direction, velocity and intensity of propagation of energy are significant for various initial vortices and thermal forcings. However, there is lack of meridional dispersions in a hemispheric domain and the energy mainly propagates eastwords. While easterly zonal flows exist ,the differences are just those in intensity and longer wavelenths propagate polewards as well as eastwards,shorter ones propagate southwards as well as eastwards.Above linear results agree well with the Ray Trace Theory. The nonlinear term can increase dispersion intensity on the poleward flank and decrease their intensity or scale on the equator flank of heating anomalies from the calculation of nonlinear model. |
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| Keywords: | initial vortices thermal forcings energy dispersion |
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