| 一次热带气旋减弱远离后出现暴雨的成因分析 |
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| 引用本文： | 罗聪,贺佳佳,张羽.一次热带气旋减弱远离后出现暴雨的成因分析[J].广东气象,2012,34(3):1-5. |
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| 作者姓名： | 罗聪 贺佳佳 张羽 |
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| 作者单位： | 1. 广州市气象台,广东广州,510080
2. 深圳市气象局,广东深圳,518000 |
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| 摘 要： | 利用常规气象资料、加密气象站观测资料、NCEP的1°×1。分析资料以及多普勒雷达资料，对2011年6月12日热带气旋减弱远离后广东发生的一次暴雨过程进行了诊断分析。结果表明：（1）地而辐合、低空切变、中层气旋式环流和高空辐散的共同作用导致了此次的暴雨过程；（2）垂直上升运动在强降水发生前即有明显反映，中低层正涡度、高层负涡度的配置也有利于上升运动的维持和强降水的发生；（3）前期不稳定能量的累积是必要条件，而K、SI指数在维持高度不稳定的条件下，其24h变化量对此次暴雨的发生有一定的提前指示意义；（4）中尺度切变、辐合对强降水的发生时间和落区移动都有较好的指示作用．中低层乖盲风切蛮增大有利于风暴的发展。
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| 关 键 词： | 天气学 暴雨 中尺度特征 垂直运动 K指数 SI指数 |
Causal Analysis of the Torrential Rain Associated with a Dissipating Away Tropical Cyclone |
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| LUO Cong
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HE Jia-jia
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ZHANG Yu.Causal Analysis of the Torrential Rain Associated with a Dissipating Away Tropical Cyclone[J].Journal of Guangdong Meteorology,2012,34(3):1-5. |
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| Authors: | LUO Cong HE Jia-jia ZHANG Yu |
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| Institution: | 1 (1.Guangzhou Meteorological Observatory,Guangzhou 510080; 2.Shenzhen Meteorological Bureau,Shenzhen 518000) |
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| Abstract: | The conventional data,densified observation,NCEP reanalysis data(1×1 deg) and the Doppler radar data are employed to investigate the cause of the torrential rain on June 12,2011 associated with a tropical cyclone dissipating away from Guangdong.Results show that(1) surface convergence,low-level wind shear,mid-level cyclonic circulation and the high-level divergence all together contributed to the torrential rain event;(2) vertical motion was clearly identified before the event,maintained by the vorticity pattern of "upper negative and mid-low level positive",which is favorable for the heavy precipitation;(3) accumulation of the instable energy is necessary,and may have some indication before the event;(4) meso-scale wind shear and convergence could be a good signature for the timing of and the movement of heavy rain event;(5) and low level vertical wind shear increment is favorable for the storm initialization. |
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| Keywords: | synoptics torrential rain meso-scale characteristics vertical motion K index SI index |
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