LAPS资料在一次鄂东初夏暴雨分析中的应用  

The Application of LAPS Data to Research a Heavy Rain in East Hubei Province in the Early Summer of 2008

作　　者：崔春光[1] 李红莉[1] 彭菊香[1] 张兵[1] 王晓芳[1] 张端禹[1] 

机构地区：[1]中国气象局武汉暴雨研究所,武汉430074

出　　处：《暴雨灾害》2008年第4期307-312,共6页Torrential Rain and Disasters

基　　金：国家自然科学基金项目(40575029);武汉暴雨研究所科研业务项目(0806)共同资助

摘　　要：利用常规气象资料和武汉暴雨研究所实时业务运行的LAPS资料,从环流背景、影响天气系统、物理量场、干侵入等方面,对2008年初夏发生在湖北东部的一次暴雨天气过程进行了诊断分析。结果表明:这次强降雨是受西风槽与西南涡东移、地面冷锋南下的影响而发生的;暴雨初期鄂东中高层出现水汽辐合,相应地中高层相对湿度与比湿增加;低层首先出现空气质量辐合,随后高层出现空气质量辐散,低层辐合与高层辐散都比强降水发生要早;鄂东暴雨期间低层维持大量云系活动。暴雨期间有随着高度增加而向东倾斜的干侵入前沿活动,这加强了当地上空中、低层对流不稳定层结,并为强降雨发生蓄积了能量;后期由于动力性条件触发,层结转化为中性,对流发展、能量释放而产生强降雨。通过暴雨个例分析发现,LAPS资料能够比较深刻地揭示出该次强降雨发生、发展的机理。By applying the conventional meteorological data and Local Analysis and Prediction System data from Wuhan Institute of Heavy Rain（LAPS）, a rainstorm in east Hubei province in the early summer of 2008 was researched. The results indicated that the rainstorm was triggered by the eastward moving low trough, the southwest vortex, and the southward moving cold front on the ground. Before the rainstorm, the specific humidity and the relative humidity at the middle and high levels had increased, but they decreased sharply after the heavy rain. Divergence at high levels and convergence at low levels all happened before the rainstorm. Large amounts of clouds were found at the low levels over east of Hubei province during the rainstorm. At the zonal vertical cross section of the potential vorticity and the relative humidity, the foreland of dry intrusion which extended eastward with increasing of height and lasted all through the heavy rain strengthened the convective instability at low levels and saved energy for the future heavy rain. Later triggered by the dynamic conditions, stratification turned to be neutral, convection developed, energy was released and the heavy rain burst. Developing mechanisms of the rainstorm can be found in detail by applying LAPS data to this case study.

关 键 词：初夏暴雨 LAPS资料 干侵入 对流不稳定 对流有效位能 

分 类 号：P458.121.1[天文地球—大气科学及气象学] TP212[自动化与计算机技术—检测技术与自动化装置]