东北地区一次突发性暴雨分析

孙力;廉毅;白乐生

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高原气象 ›› 1995, Vol. 14 ›› Issue (4) : 486-494.
论文

东北地区一次突发性暴雨分析

  • 孙力;廉毅;白乐生
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A DIAGNOSTIC ANALYSIS OF FLASH HEAVY RAIN IN NORTHEAST CHINA

  • Sun Li;Lian Yi;Bai Lesheng
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摘要

通过对1991年7月20日长春南部一次突发性暴雨过程位温梯度倾向、稳定度、水汽条件及中尺度动能的收支平衡分析,研究了此次强天气发生的物理背景和形成机制。结果表明:(1)暴雨发生前,θse梯度显著增强区、对流不稳定区及其倾向分布、Q矢量辐合区的存在以及水汽含量的大幅度增长为此次强对流天气的发生提供了良好的物理背景和环境条件。(2)此次突发性暴雨以中尺度能量过程为主,大中尺度之间通过非线性相互作用造成的能量转换是其形成的重要机制。

Abstract

In this paper,a diagnostic analysis on a case of flash heavy rain occurred in the south part of Changchun on 20 July 1991 is conducted Results show (1) Before the occurrence of this flash heavy rain,the existence of θse-gradient reinforcement area,convective instability area and its tendency, Q-vector convergence area and greatly increasing of vapour content provide advantageous environmental conditions for the occurrence of the heavy rain (2) The energy transformation between the large-scale and meso-scale motions by non-linear interactions processes was a main physical mechanism for the formation of the flash heavy rain.

关键词

突发性暴雨 / 环境条件

Key words

Flash heavy rain / Environmental condit

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孙力;廉毅;白乐生. 东北地区一次突发性暴雨分析. 高原气象. 1995, 14(4): 486-494
孙力;廉毅;白乐生. A DIAGNOSTIC ANALYSIS OF FLASH HEAVY RAIN IN NORTHEAST CHINA. Plateau Meteorology. 1995, 14(4): 486-494

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