基于多源探测资料的一次广州局地强对流垂直结构分析  

AN ANALYSIS OF THE VERTICAL STRUCTURE OF LOCAL STRONG CONVECTION IN GUANGZHOU BASED ON MULTI-SOURCE DETECTION DATA

作　　者：曾琳 张羽 李怀宇 李浩文 高美谭 梁之彦 ZENG Lin;ZHANG Yu;LI Huaiyu;LI Haowen;GAO Meitai;LIANG Zhiyan(Guangzhou Meteorological Observatory,Guangzhou 511430,China)

机构地区：[1]广州市气象台,广东广州511430

出　　处：《热带气象学报》2023年第3期348-360,共13页Journal of Tropical Meteorology

基　　金：广东省自然科学基金(2022A1515011346);广州市科技计划项目(2023B04J0631);广州市科技计划项目(202103000030);广州市基础与应用研究项目(202201011093)共同资助。

摘　　要：基于X波段相控阵雷达、S波段双偏振雷达、微波辐射计、风廓线雷达、毫米波云雷达等多源高时空分辨率新型遥感探测资料,对广州后汛期一次局地强对流过程的大气热力、动力及云物理结构变化特征进行了综合分析。结果表明:(1)强对流前8小时前,局地LI、CAPE、SI等对流参数就达到并远远超过了短时强降水的阈值;临近降水大气层结仍向不稳定发展,水汽条件向有利的方向发展;(2)午后局地风形成辐合,上升气流加强,近地层出现弱垂直风切变和低空急流脉动,对强对流的发生发展有一定的指示意义;(3)CINRAD/SA-D雷达CR、DBZM HT、TOPS、VIL等变化与强降水和地面大风的发展有很好的对应关系,同时低层风场观测到阵风锋特征;XPAR-D雷达更高时空分辨率的探测可清晰显示对流发展旺盛阶段的ZDR弧、KDP柱、ZDR柱、V型缺口等特征,为判断雷暴云团的发展程度和预警提供重要信息。Based on multi-source high temporal and spatial resolution new remote sensing detection data such as X-band phased array radar,S-band dual-polarization radar,microwave radiometer,wind profiler radar,millimeter-wave cloud radar,etc.Atmospheric thermal,dynamic and cloud physical structure change characteristics are comprehensively analyzed.The results are shown as follows:(1)Eight hours before strong convection,local LI,CAPE,SI and other convective parameters reached or exceeded the short-term heavy precipitation threshold.Before the precipitation approached,the atmosphere tended to be unstable,and the water vapor condition developed in a favorable direction.(2)Local winds converged in the afternoon,updraft strengthened,a weak vertical wind shear and low-level jet pulsation appeared in the near-surface layer,which were somewhat indicative for the occurrence and development of strong convection.(3)The changes of CR,DBZM HT,TOPS,and VIL of the CINRAD/SA-D had a good corresponding relationship with the development of heavy precipitation and ground wind,while,the characteristics of gust fronts were observed in the low-level wind field.The detection of XPAR-D with higher spatial and temporal resolution clearly showed the characteristics of ZDR arc,KDP column,ZDR column,and V-shaped notch in the stage of vigorous convection development provide important information for judging how well thunderstorm cloud clusters developed and their early warning.

关 键 词：相控阵雷达 双偏振雷达 垂直结构 局地强对流 广州 

分 类 号：P458.2[天文地球—大气科学及气象学]