| 低层流场短时波动和中尺度扰动自激作用 |
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| 引用本文： | 金秀兰.低层流场短时波动和中尺度扰动自激作用[J].气象,1991,17(9):9-14. |
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| 作者姓名： | 金秀兰 |
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| 作者单位： | 江苏省气象科研所 |
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| 摘 要： |
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| 关 键 词： | 流场 波动 中尺度 扰动 暴雨 预报 |
Short-time fluctuation in flow field of lower levels and trigger action of mesoscale disturbance |
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| Abstract: | In this paper,the selfrecording data over denser surface are used to analyse strong surface wind and its fluctuation in the process of typhoon-caused severe rain corresponding with the genesis and movement of the rain clusters in downstream as well as oscillation of rain intensity.The values of nonlinear terms in the divergence and vorticity equation are computed.Local variation of the divergence caused by the inhomogene-ous distribution of the surface wind velocity and the effects of interaction between vorticity field and divergence field on trigger process of mesoscale system of severe rain are discussed.Finally, it is also pointed out that it is helpful to be knowledyed of the feature and variation of surface wind field in order to catch of mesoscale system of severe rain and to make the short-time forecast of it. |
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