摘要
利用常规高空观测资料、卫星云图资料、闪电定位系统资料和香格里拉机场天气雷达资料,对2011年8月31日发生在香格里拉的雷暴天气进行了分析,结果表明:北部高压外围东北气流、东南沿海热带低压外围东北气流和700 hPa孟加拉湾低压偏南气流提供了此次雷暴天气的水汽和不稳定能量,致使香格里拉对流发展旺盛而产生雷暴天气;雷暴区出现在负地闪密度高值中心附近;雷暴发生时,雷达回波中心强度达55 dBz.这次的强雷暴天气过程对基于雷达资料的雷电识别指标进行检验,即40 dBz回波达到-10℃的层结高度这一指标,对应闪电定位资料,发现该指标能够很好地识别出闪电发生区域.在雷达回波图上表现强回波小云团的相互合并加强并形成较为典型的单体云团,且镶嵌在大面积的层状云中;多普勒雷达径向速度特征变化更能揭示闪电发生发展的变化趋势,逆风区对应雷暴中心区域,不仅是强降水的中心区也是闪电的中心区,对逆风区的监测识别能够更好地指导雷暴预警报工作;在卫星云图上MCS云团相互合并成典型的强对流云团,尺度较大,亮温较低.这些初步指标对青藏高原东南部的雷暴天气分析有一定的价值.
This thesis analyzes the thunderstorm occurred on Aug 31,2011 based on weather radar data of Shangri-La airport together with routine aerological observation data,satellite cloud picture data and lightning positioning system data,and the result shows,the outer-ring northeast wind of the high pressure in the east and ? the outer-ring northeast wind of the tropical depression in the southeast coast and the southerly wind of tropical depression in the bay of Bengal accumulate vapor and instability energy for the thunderstorm this time,and consequently lead to the thunderstorm triggered by active atmospheric convection in Shangri-La which locates in southeast Tibetan Plateau;and the analysis of radar echoes shows that the centric intensity is up to 55 dBz when the thunderstorm occurs;thunderstorm belt is around the area where the negative micro second wave flashover is of the highest value.The thunderstorm this time also tested the lightening identifying indicator based on radar data,which is 40 dBz radar echo get to-10 ℃ stratification height.Compared with lightning positioning data,this lightening identifying indicator is proved to be capable of detecting the lightening area correctly.In radar echo chart,small clouds with strong echoes embedded in extensive stratiform clouds combine with each other to strengthen and form a more typical monomer clouds,Doppler radial velocity variations can better reveal the characteristics of the occurrence and development trend of lightning.adverse wind region is the thunderstorm central area,which is the central area of heavy rain and of lightening area as well.Therefore,monitoring the adverse wind region can better the prompt detection of thunderstorm warning MCS clouds in satellite images merge into one another and form typical strong convective cloud,and larger the scale,lower the brightness temperature,and the cloud has been strengthened.These preliminary indicators should have some value on the thunderstorm weather analysis in southeastern Tibetan Plateau.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第S2期300-308,共9页
Journal of Yunnan University(Natural Sciences Edition)
基金
中国气象局大气探测重点开放实验室课题(KLAS201105)
NSFC-云南省联合基金(U1133603)
关键词
云南
香格里拉
雷暴天气
Shangri-La
the thunderstorm weather
analysis
