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当前位置: 首页 > 文章 > 周口市2012年7月4日持续性强对流天气过程分析 农业灾害研究 2012,2 (6) 61-66
Position: Home > Articles > Analysis of the Continu-ous Severe Convection Weather in Zhoukou City on July 4,2012 Journal of Agricultural Catastrophology 2012,2 (6) 61-66

周口市2012年7月4日持续性强对流天气过程分析

作  者：
董彬
单  位：
周口市气象局
关键词：
强降水;NCEP;中分析;物理量场;假相当位温
摘  要：
利用NCEP的1°×1°再分系资料和常规天气观测资料,分析2012年7月4—5日河南中东部的持续性强降水天气过程的影响系统,及其演变过程特征和物理量场变化。分析结果表明,①该次持续性强对流天气发生在典型的两槽一脊大尺度环流背景下,稳定维持的副热带高压和冷涡后的冷空气的南下入侵,促使西风槽缓慢东移加深,配合低空激流的频繁活动和西南涡的移出,致使该次强对流天气有一定的持续性,且为强对流的建立和发展提供了条件。②中分析表明,前一时段,"后倾槽"式的整层饱和探空结构对应的短时暴雨天气与实际相同;中间强降水时段,急流在河南中东部的辅合,配合充沛的水汽使热力不稳定加强,更易加强对流的低涡天气,配合急流的位置,使得低涡的移出路线就是强降水的落区;后一时段,急流的缓慢东移使得位于急流左侧的周口东部地区又产生一次降水集中时段后逐渐趋于减弱。③从物理量场分析可看出,较长时间的暖湿水汽供应和垂直上升运动提供了良好的水汽和动力条件。假相当位温剖面图指出,上干冷下暖湿的配置使大气处于层结不稳定状态,给该次降水提供了热力不稳定条件。
译  名：
Analysis of the Continu-ous Severe Convection Weather in Zhoukou City on July 4,2012
作  者：
DONG Bin(Zhoukou City Meteorological Bureau,Zhoukou,Henan 466000)
关键词：
Heavy rainfall;NCEP;Mesoanalysis;Physical quantity field;Equivalent potential temperature
摘  要：
NCEP 1°×1°subdivision materials and conventional weather observation data were used to analyze the influence system of continuous severe convection weather in central and eastern Henan during July 4 and 5,2012,as well as its evolution features and changes of physical quantity field.The results showed that(a) this continuous severe convection weather occurred agaianst the background of typical "two troughs and one ridge" large-scale circulation,the stably-maintained subtropical high pressure and cold air after cold vortex moved southwards to push westerly trough eastwards slowly.In addition,frequent low-altitude torrent and shifting southwest vortex contributed to the continuity of this severe convection weather,and laid a solid condition for the establishment and development of severe convection weather.(b) According to the mesoanalysis,in the previous stage,the short-term rainstorm corresponding to "tilting trough" saturated sounding structures of the whole layer complied with the actual conditions;during the middle-period strong rainfall,torrents met in eastern and central Henan,the abundant moisture enhanced the instability of heat,especially low vortex of convection.The shifting-out route of the low vortex was the precipitation area.In the later period,torrents moved eastwards slowly,so eastern Zhoukou in the left side of torrents witnessed another concentrated rainfall and then torrents declined gradually.(c) From the perspective of physical quantity field,long-term warm-humid moisture supply and vertical ascent guaranteed favorable moisture and dynamic conditions.According to profile map of equivalent potential temperature,the dry and cold air in the upper layer and warm and humid air in the lower layer led in instable atmospheric stratification,and provided thermal instability for the rainfall.

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