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武汉地区4次低质心类短时强降水对流风暴特征分析
王孝慈, 李双君
(武汉中心气象台)
Analysis on the characteristics of 4 convective storms with low-echo-centroid of short-term heavy rainfall in Wuhan
wang xiao ci, LI shuang jun
(Wuhan Central Meteorological Observatory)
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投稿时间:2020-11-18    修订日期:2021-04-25
中文摘要: 利用自动气象站逐小时和逐5分钟观测资料、长江中游雷达组合反射率因子SWAN拼图产品及NCEP FNL再分析资料,对武汉地区4次低质心类短时强降水对流风暴特征进行分析。结果表明:(1)不同的天气背景诱发的对流系统特征不同,暖强迫背景下,环境条件高能高湿,雷暴冷池的积累有利于稳定性降水前沿触发线状对流;斜压锋生背景下,冷暖交汇剧烈,斜压增强,地面多有中尺度气旋波发展,锋区冷区稳定性降水中多伴随短时强降水,而暖区能量、湿度条件更好,易诱发短时强降水等分散性强对流;准正压背景下,大气斜压性较弱,但高能高湿的环境以及近地面层流场强迫和局地热力差异,易触发剧烈的热对流活动。(2)从对流风暴雷达回波特征和降水特征来看,TS类移速较快,造成的短时强降水范围小;准静止类表现为带状走向的大范围层状云回波稳定维持,中间伴随有多个积云对流回波生消交替,每一阶段降水增强都与新生对流单体途经武汉站点相对应;组织合并类在回波合并时,常伴随着强降水的发生,合并后的回波形态和走向影响着降水的强度和持续时间。(3)不同的环境背景、触发诱因和组织形态下,短时强降水发生前后地面气象要素表现出不同的变化特征;锋面特征和对流触发位置的不同导致温度变化不同。(4)地面中尺度系统对于MCS的触发、组织发展有重要作用,其生消演变相对于MCS在时间上通常具有一定的提前量,关注地面辐合线,温度锋区等地面中尺度系统的发展演变,对于预判MCS的触发、组织形态的演变等具有很好的指示意义。
Abstract:Based on hourly and 5-minute observation data of automatic weather station, swan mosaic product of radar combined reflectivity factor in the middle reaches of the Yangtze River and NCEP FNL reanalysis data, the characteristics of four convective storms with low-echo-centroid type of short-term heavy precipitation in Wuhan were analyzed. The results showed that: (1) the characteristics of convective system induced by different weather background were different. Under the background of warm forcing, the environmental conditions were high energy and high humidity, and the accumulation of thunderstorm cold pool was conducted to triggering linear convection in the stable precipitation front; under the baroclinic frontogenesis background, the convergence of cold and warm was intense, and the baroclinic was strengthened; there were more mesoscale cyclone waves on the ground, and the stable precipitation in the front area was often accompanied by a short-term strong drop Under the quasi barotropic background, the baroclinic atmosphere was weak, but the high-energy and high humidity environment as well as the near surface layer flow field forcing and local thermal difference were easy to trigger severe thermal convection activities. (2) According to the radar echo characteristics and precipitation characteristics of convective storms, TS type moved faster, resulting in a small range of short-term heavy rainfall; quasi-stationary type showed that the echo of large-scale stratiform cloud with zonal trend was stable, and there were multiple cumulus convective echoes in the middle. The precipitation enhancement in each stage corresponds to the new convective cell passing through Wuhan station; the consolidation type was in the circulation When the wave merges, it was often accompanied by the occurrence of heavy rainfall, and the echo shape and direction after merging affect the intensity and duration of precipitation. (3) Under different environmental background, trigger inducement and organizational form, the surface meteorological elements before and after the occurrence of short-term heavy rainfall showed different change characteristics; the different front characteristics and convection trigger positions leaded to different temperature changes. (4) Ground mesoscale system played an important role in triggering and organizing the development of MCS. Its generation, elimination and transformation usually heaved a certain advance in time for MCS. Paying attention to the development and evolution of ground mesoscale systems such as ground convergence line and temperature front area was of great significance for predicting the triggering and organizational evolution of MCS.
文章编号:202011180407     中图分类号:    文献标志码:
基金项目:国家重点基础研究发展计划(973计划)
作者单位地址
王孝慈 武汉中心气象台 湖北省武汉市洪山区东湖东路3号湖北省气象局武汉中心气象台
李双君 武汉中心气象台 湖北省武汉市洪山区东湖东路3号湖北省气象局武汉中心气象台
Author NameAffiliationAddress
wang xiao ci Wuhan Central Meteorological Observatory 湖北省武汉市洪山区东湖东路3号湖北省气象局武汉中心气象台
LI shuang jun  湖北省武汉市洪山区东湖东路3号湖北省气象局武汉中心气象台
引用文本:
王孝慈,李双君,0.Analysis on the characteristics of 4 convective storms with low-echo-centroid of short-term heavy rainfall in Wuhan[J].Meteor Mon,():-.
wang xiao ci,LI shuang jun,0.Analysis on the characteristics of 4 convective storms with low-echo-centroid of short-term heavy rainfall in Wuhan[J].Meteor Mon,():-.