| 锋面波发展演变与气旋形成的数值研究 |
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| 引用本文： | 肖庆农,张颖,李微.锋面波发展演变与气旋形成的数值研究[J].大气科学,1995,19(4):465-474. |
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| 作者姓名： | 肖庆农 张颖 李微 |
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| 作者单位： | 南京大学大气科学系，南京 210093,空军气象学院，南京 211101,空军气象学院，南京 211101 |
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| 摘 要： | 本文将锋面作为密度的零级不连续面，对锋面上扰动的非线性发展演变进行了数值研究，所用的锋面模型是f平面上的浅水、两层模型，差分格式具有位涡拟能守恒和动能守恒的性质。锋面波的发展与初始扰动尺度有关，天气尺度的扰动可以维持较长的发展时间，形成较大振幅的波动，其结构类似于具有锢囚锋结构的气旋，相反，较小尺度扰动不易形成锢囚锋结构。同时，锋面波的发展演变受Richardson数(Ri)的影响，Ri越小，锋面波发展的时间越长，波动振幅越大；Ri越大时，锋面波发展的时间越短，波动容易衰减。锋面波的发展类似于气旋的形成过
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| 关 键 词： | 锋面扰动 稳定性 气旋 数值研究 |
Numerical Study on Evolution of Frontal Waves and Cyclogenesis |
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| Xiao Qingnong,Zhang Ying and Li Wei.Numerical Study on Evolution of Frontal Waves and Cyclogenesis[J].Chinese Journal of Atmospheric Sciences,1995,19(4):465-474. |
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| Authors: | Xiao Qingnong Zhang Ying and Li Wei |
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| Abstract: | In this paper, the front is considered as a surface of zero-order discontinuity. In such a way, we designed a shallow water, two-layer model in fplane. The model is written in finite differences according to kinetic energy and potential etrstrophy conserving scheme. It is indicated that the evolution of frontal waves is selective to the scale of initial disturbance. The synoptic-scale disturbance can be evolved to large-amplitude frontal wave which is similar to occluded cyclone. When the scale of initial disturbance is decreased, the amplitude of frontal wave is also decreased. As a result, such a frontal wave has shorter life-time, and no structure of occluded cyclone. In addition, the evolution depends on Richardson number Ri. The less Ri is, the more intensely the frontal waves evolve. When a frontal wave evolves to an intense state, it is similar to a cyclone. |
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| Keywords: | frontal disturbance instability cyclone numerical study |
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