| 东移低涡动力学的初步研究 |
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| 作者姓名： | CHEN Lianshou LUO Zhexian |
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| 作者单位： | [1]ChineseAcademyofMeteorologicalSciences,Belting100081 [2]NanjingInstituteofMeteorology,Nanjing210044 |
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| 基金项目： | the National Natural Science Foundation under Grant No.
49775263，the project of the Tibetan Plateau Experiment
(TIPEX)of Atmospheric Science and the 973 Project on
heavy rain in China. |
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| 摘 要： | 用一个正压原始方程模式实施了六组试验，研究了东移低涡的动力学。结果表明：无论是切变基流与低涡的相互作用，还是涡块与低涡的相互作用，都可引起低涡强度在短暂时段内增强，但整个积分时段内低涡强度的演变仍呈下降趋势。切变基流、低涡和多个涡块的相互作用，可以改变下降的趋势。正相对涡度切变基流中低涡和涡块的合并，是东移低涡强度得以维持和发展的一个直接的原因。
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| 关 键 词： | 东移低涡 大气动力学 切变基流 涡块 相互作用 低涡强度 正压原始方程模式 实验研究 |
| 收稿时间： | 20 January 2002 |
A preliminary study of the dynamics of eastward shifting cyclonic vortices |
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| CHEN Lianshou,LUO Zhexian.A preliminary study of the dynamics of eastward shifting cyclonic vortices[J].Advances in Atmospheric Sciences,2003,20(3):323-332. |
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| Authors: | Chen Lianshou Luo Zhexian |
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| Institution: | Chinese Academy of Meteorological Sciences, Beijing 100081,Nanjing Institute of Meteorology, Nanjing 210044 |
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| Abstract: | The dynamics of eastward shifting cyclonic vortices are investigated in terms of a barotropic primitiveequation model, and six experiments are performed. Both the interaction of a cyclonic vortex with vorticitylumps and the interaction of the vortex with the shearing basic flow may induce the strengthening of thevortex in a short period, however, the vortex intensity still shows a general decreasing tendency over thewhole integration time period. The interaction among the shearing basic flow, cyclonic vortex, and multiplevorticity lumps can change the tendency. The merging of the cyclonic vortex with vorticity lumps in theshearing basic flow of positive vorticity is directly responsible for the maintenance and development of thecyclonic vortex. |
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| Keywords: | eastward shifting cyclonic vortex shearing basic flow vorticity lump merging of vortexwith lumps intensification of vortex |
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