基于双多普勒雷达及闪电资料分析一次强降水过程  

Analyzing a Heavy Rainfall Process Based on Dual-Doppler Radar and Lightning Data

作　　者：杨丽丽[1] 杨毅[1] 张廷龙[2] 王莹[1] 

机构地区：[1]兰州大学大气科学学院甘肃省干旱气候变化与减灾重点实验室,兰州730000 [2]中国科学院寒区旱区环境与工程研究所陆面过程与气候变化重点实验室,兰州730000

出　　处：《高原气象》2015年第2期546-555,共10页Plateau Meteorology

基　　金：国家重点基础研究发展计划(2014CB441406);国家自然科学基金项目(41175092,40905001)

摘　　要：为进一步了解多普勒雷达及闪电资料在中小尺度天气系统方面的应用以及降水系统动力结构的研究,利用合肥和阜阳两部S波段多普勒雷达资料,通过两步变分反演法反演双雷达,并采用模糊逻辑算法进行云类型识别,再结合垂直累计液态水含量VIL、降水和闪电分布特征,分析了2010年6月7-10日发生在安徽合肥和阜阳的一次持续性强降水过程。结果表明:此次持续性强降水过程与风场的低层辐合和高层辐散、风场的气旋性旋转以及水平风切变相关;此次降水过程是以层状云降水为主的积云混合云降水;另外,以降水为主的层状云,其闪电频数低且以负闪为主,闪电之后20 min左右出现强降水;此次暴雨的VIL值不是很大,强降水区对应的VIL值基本<3 kg·m-2;云识别结果、降水区、VIL值与雷达回波强度之间的对应关系较好。In order tofurther understand the application of Doppler radar data in mesoscale weather system as well as thedynamical structureof precipitationsystem,a large-scaledand more accurate inversion resultis aimed to get,basing on the new ly-proposed fuzzy logical algorithm of cloud classification and the two-step variational method which is applied to dual-Doppler radar. The data come from Dual-Doppler Radar' s(S-band) observation in Hefei and Fuyang,Anhui province. A heavy rainfall processoccurred in Anhui Province on 7 ~ 10 June in 2010 is analyzed by utilizing vertical accumulative total liquid water content(VIL),rainfalland distribution of lightning. The results show that this persistentrainfall is associated with the wind fieldsw hichcantains a convergence in low er layers and a divergence in higher layers,a cyclonic wind rotation and a wind shear line. This rainfall process which is based on stratiformis show n to be a hybridcumuluscloudprecipitation. Besides,the stratiform lightning is few during this rainfall and mainly focuses on the negative ground flashes. The heavy rain occurred20 minutes or so after lightning. The value of VIL in this heavy rainfall is small,which is less than 3 kg ·m-2.There are strong relationships among cloudclassification,the area of rain,VIL and Radar's echo.

关 键 词：降水 双雷达 反演 云识别 闪电 

分 类 号：P458.121[天文地球—大气科学及气象学]