论文

河南一次强对流天气潜势、触发与演变分析

  • 吕晓娜
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  • 河南省农业气象保障与应用技术重点开发实验室, 郑州 450003;河南省气象台, 郑州 450003

收稿日期: 2015-07-03

  网络出版日期: 2017-02-28

基金资助

河南省气象局强对流预报创新团队;中国气象局预报员专项(CMAYBY2015-044);中国气象局关键技术集成与应用项目(CMAGJ2015M36);河南省气象局科研项目(KZ201702)

Potential Trend, Trigger and Evolution Analysis of a Thunderstorm Case in Henan

  • LYU Xiaona
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  • Key Laboratory of Agrometeorological Ensuring and Applied Technique, Zhengzhou 450003, China;Henan Meteorological Observatory, Zhengzhou 450003, China

Received date: 2015-07-03

  Online published: 2017-02-28

摘要

应用业务中可及时获取的常规观测资料和卫星、雷达、自动站等资料,结合地形情况从产生强对流天气的四个要素出发,对2013年7月31日夜出现在豫西山区、豫北的一次强对流天气进行了深入分析。结果表明(1)受低层西南暖湿气流、地面东南风、大气晴空辐射和逆温“干暖盖”的共同作用,31日白天不稳定能量迅速集聚。夜间,华北冷涡后干冷空气东移南下,豫西、豫北大气层结不稳定度加强。(2)干冷空气与暖湿空气交汇,在地面上表现为弱冷锋、干线和中尺度辐合线,触发雷暴在关中盆地生成或发展。(3)关中盆地至豫西、豫北的特殊地形配合一定的流场,使得该区易形成三个辐合区,对流在辐合区附近形成或发展。除高空引导气流外,地面中尺度辐合线对云团移动有很好的指示作用。(4)湿球0℃层高度与冰雹关系较为紧密。

本文引用格式

吕晓娜 . 河南一次强对流天气潜势、触发与演变分析[J]. 高原气象, 2017 , 36(1) : 195 -206 . DOI: 10.7522/j.issn.1000-0534.2016.00023

Abstract

Based on conventional observation data, satellite, radar, automatic observations and so on, starting from the four elements, the severe convective weather which happened in the northwest of Henan at the night of 31 July 2013 is analyzed.The results showed that:(1) Because of the joint action of southwest warm and moist air flow in the low level, surface southeast flow, clear-day radiation and inversion, unstable energy gathered quickly.At night, dry cold air moved eastward, and the instability of atmosphere strengthened.(2) The convergence of Dry cold air and moist air, which was weak cold front, trunk and mesoscale convergence line at surface, was the trigger system.(3) Because of the special terrain from Guanzhong Basin to Henan, three convergence areas formed, where convection developed usually.Besides upper air, surface mesoscale convergence line had a good indication on the movement of MCS.(4) The WBZ (Wet Bulb Zero) was Closer relationship with hail.

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