| 南风气流对四川盆地西部突发性暴雨影响的数值试验 |
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| 引用本文： | 郁淑华,何光碧,滕家谟.南风气流对四川盆地西部突发性暴雨影响的数值试验[J].成都信息工程学院学报,1997(4). |
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| 作者姓名： | 郁淑华 何光碧 滕家谟 |
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| 作者单位： | 四川省气象科研所(郁淑华)，四川省气象台(何光碧)，四川省气象局(滕家谟) |
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| 摘 要： | 用η模式对１９９５年８月２４日四川盆地西部的突发性暴雨，进行了数值模拟和南风减速的数值试验。由模拟和试验比较分析得出以下几点认识：１．对流层低层的云南、贵州到四川南部南风气流的加大，对四川盆地西部的暴雨区，特别是大暴雨区的扩大和强度的增强起着重要作用。２．由南风气流的加强造成暴雨加强的动、热力机制主要是，使暴雨区及其附近区域上空，对流层的中、低层流场的辐合、上升运动加强；对流层的低层形成水汽通量的辐合区。３．对流层低层南风气流的加强，可影响对流层中层的暖湿程度减弱，从而加强了对流层低－中层内的对流性不稳定
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| 关 键 词： | 南风气流 突发性暴雨 数值试验 |
NUMERICAL EXPERIMENT OF THE INFLUENCE OF SOUTHERN FLOW ON TORRENTIAL RAIN IN WEST SICHUAN BASIN |
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| Yu,Shuhua.NUMERICAL EXPERIMENT OF THE INFLUENCE OF SOUTHERN FLOW ON TORRENTIAL RAIN IN WEST SICHUAN BASIN[J].Journal of Chengdu University of Information Technology,1997(4). |
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| Authors: | Yu Shuhua |
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| Institution: | Yu Shuhua (Sichuan Meteorological Research Institute) He Guangbi(Sichuan Observatory of Meteorology) Teng Jiamo(Sichuan Bureau of Meteorology) |
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| Abstract: | By using the ETA model,the numerical experiment of diminishing wind speed of southern flow are mode for a sharp torrential rain in west Sichuan basin.The results are as follows.1.The increase of wind speed of southern flow in lower troposphere above Yunnan,Guizhou and the south of Sichuan strengthens the heavy rain.2.The main mechanisms of strengthening heavy rain by increasing wind speed of southern flow are that the convergence and the ascent motion of flow field in lower and middle troposphere over the heavy rain area are strengthened,and that the convergence of vapour flux there are formed.3.The wet and warm degree in middle troposphere is weakened and the convective instability in lower middle troposphere is strengthened by increasing wind speed of southern flow. |
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| Keywords: | Southern flow Sharp torrential rain Numerical experiment |
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