一次特大暴雨過程的多普勒天氣雷達資料分析

doi:10.3969/2012jms.00**

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一次特大暴雨過程的多普勒天氣雷達資料分析
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                        10.3969/2012jms.00**
                    
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中圖分類號:P458.1211
基金項目:江蘇省氣象科研開放基金項目(200910);中國氣象局氣象新技術(shù)推廣項目預(yù)報員專項(CMATG2009YB12)

Analysis on Doppler weather radar data of an extraordinarily heavy rainfall

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利用衛(wèi)星云圖和多普勒天氣雷達資料對2008年8月1—2日上午發(fā)生在安徽東南部及江蘇西南部特大暴雨過程進行了分析。結(jié)果表明，這次區(qū)域性特大暴雨是由臺風(fēng)減弱演變?yōu)樯詈竦蛪合到y(tǒng)所引發(fā)，暴雨區(qū)域輻合上升運動強烈，西南低空急流強盛，同時中層冷空氣侵入觸發(fā)不穩(wěn)定能量釋放；特大暴雨的發(fā)生與中β尺度強對流云團多次發(fā)展以及長時間維持密切相關(guān)，中尺度云團的最冷云區(qū)亮溫和面積決定了暴雨強度；積層混合云降水回波內(nèi)部有多個尺度不等的的對流回波相繼經(jīng)過暴雨發(fā)生地形成“列車效應(yīng)”，從而造成持續(xù)性暴雨，暴雨回波的強回波核總是位于云體的中下部，這是暴雨回波的典型特征；特大暴雨發(fā)生階段，對流層中低層輻合厚度增加，強度增強，同時低層（2 km以下）伴隨下沉運動，2 km以上則為上升運動。

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Based on the satellite cloud picture and Doppler weather radar data, the extraordinarily heavy rainfall from 1 August to 2 August, 2008 occurred in southeast of Anhui province and southwest of Jiangsu province was analyzed. The results show that the rainstorm was caused by re-intensified depression as the result of landfall of typhoon. There was severely convergent ascending motion and southwest low-level jet over rainstorm area. The cold air-mass which was intruded into middle troposphere triggered the instability energy. The severely heavy rainfall correlated with several times developments and long standing maintenance of the meso-β scale MCS. Both the lowest cloud field luminance temperature and the area of meso scale cloud cluster decided the rainstorm intensity. And the area of the temperature below -73 ℃ of cold cloud cluster correlated with rainstorm area very well. Several convection cells inside the cumulus-stratus mixed echo passed through rainstorm area in turn and brought about “train effect” and led to a sustained rainstorm. During heavy rainfall stage, the thickness of convergence in middle and low troposphere increased and intensity reinforced. The divergence in upper troposphere was weak. Descending motion prevailed in low troposphere（ below 2 km） and ascending motion was above 2 km. 

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蔣義芳,尹東屏,劉安寧.一次特大暴雨過程的多普勒天氣雷達資料分析.氣象科學(xué),2011,(3):347-353 JIANG Yifang, YIN Dongping, LIU Anning. Analysis on Doppler weather radar data of an extraordinarily heavy rainfall. Journal of the Meteorological Sciences,2011,(3):347-353

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