| 1991年江淮特大暴雨的位涡分析与冷空气活动 |
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| 引用本文： | 陆尔,丁一汇.1991年江淮特大暴雨的位涡分析与冷空气活动[J].应用气象学报,1994,5(3):266-274. |
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| 作者姓名： | 陆尔 丁一汇 |
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| 作者单位： | 中国气象科学研究院 |
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| 摘 要： | 文章用位涡分析讨论１９９１年５－７月江淮特大暴雨期间的冷空气活动特征及其对暴雨形成的作用，结果表明，在持续的东亚阻塞形势下，中高纬冷空气分三次以低频振荡（１５－２０天）的形式南下、侵入江淮流域。南下冷空气在江淮一带被来自低纬的西南暖气流和东南暖气流所切断，形成一高位涡冷空气中心，它与两支暖气流相互作用，维持梅雨锋，从而形成持续性暴雨。冷、暖空气相互作用的结果使东亚温度场呈现南北暖、中间冷的形式。
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| 关 键 词： | 暴雨 位势涡度 冷空气活动 |
Isentropic Potential Vorticity Analysis and Cold Sir Activity During the Period of Excessively Heavy Rain over Changjiang-Huaihe River Basin in 1991 |
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| Lu Er,Ding Yihui,Li Yuehong.Isentropic Potential Vorticity Analysis and Cold Sir Activity During the Period of Excessively Heavy Rain over Changjiang-Huaihe River Basin in 1991[J].Quarterly Journal of Applied Meteorology,1994,5(3):266-274. |
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| Authors: | Lu Er Ding Yihui Li Yuehong |
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| Affiliation: | (Chinese Academy of Meteorological Sciences, Beijing 100081) |
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| Abstract: | Isentropic potential vorticity(IPV)analysis method is used in this paper toinvestigate the feature of cold air activity during the period of the 1991 excessively heavyrain, and its effect on the formation of the three episodes of heavy rain occuring in thismeiyu season over Changjiang-Huaihe River basin. It is shown that under the persistentEast Asian blocking situation cold air in mid-high latitudes vigorously invadesChangjiang-Huaihe River basin three times with the mode of a low frequency oscillation(15-20 days). Over this region,the cold air is cut off by southwest and southeast warmairflows and interacts with warm airflows, and which leads to maintain the meiyu front,and cause persistent heavy rainsfalls, Because of the interaction between cold and warmairs ,the low-level ternperature distribution in East Asia is shown up with a sandwichedpattern : cold air in Changjiang-Huaihe River basin, and warm air to the south and thenorth. Such thermal structure may induce certain change of meiyu front structure and itis worthwhile to pay more attention to it. |
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| Keywords: | Heavy rain Isentropic potential vorticity Cold air activity |
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