台风“利奇马”(1909)快速增强事件的降水演变  

Precipitation evolution during the rapid intensification event of typhoon “Lekima”( 1909)

作　　者：吕巧谊 张玉轩 江慧远 郑辉 陈德花 胡雅君 LYU Qiaoyi;ZHANG Yuxuan;JIANG Huiyuan;ZHENG Hui;CHEN Dehua;HU Yajun(Laboratory of Straits Meteorology,Fujian Xiamen 361012,China;Xiamen Meteorological Observatory,Fujian Xiamen 361012,China;Academy of Atmospheric Physics,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]海峡气象开放实验室,福建厦门361012 [2]厦门市气象台,福建厦门361012 [3]南京信息工程大学大气物理学院,南京210044

出　　处：《气象科学》2020年第1期136-142,共7页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41805028; 41705045; 41675018);福建气象局新录用研究生基层专项项目(2019G04)

摘　　要：利用台风路径资料及GPM多星集合降水反演产品(IMERG),分析了“利奇马”台风快速增强(RI)事件的平均降水率、降水(>0 mm·h^-1)和短时强降水(>20 mm·h^-1)的覆盖率随时间的演变。进一步,将RI事件分为RI启动前0~24 h、RI启动期、RI持续期、RI结束前0~24 h,和RI结束后0~24 h等阶段,分析平均降水率、降水和短时强降水发生频率的空间分布。研究结果表明:(1)在整个RI事件中,平均降水率和短时强降水发生频率较高的区域主要集中在台风中心西北方位,但其面积和位置随阶段转换而变化;(2)在RI启动前0~24 h,降水覆盖率的高值区由台风内核逐渐扩大至台风外围,而平均降水率和短时强降水覆盖率在RI启动后才明显增强;(3)在RI启动前0~12 h到RI结束前0~24 h的4个阶段,平均降水率和短时强降水发生频率的高值区都出现在台风移动方向的正前方。Based on the typhoon track data and the Integrated Multi-satellite Retrievals for GPM(IMERG),the evolution of the average precipitation rate,the coverage rates in terms of the precipitation(>0 mm·h^-1)and the short-term heavy rainfall(>20 mm·h^-1)are examined during the Rapid Intensification(RI)event of typhoon“Lekima”.The RI event is divided into varied stages including a period of 0—24 h before RI starts,RI initiation,RI duration,a period of 0—24 h before RI ends,and a period of 0—24 h after RI ends,and then spatial distributions of associated precipitation parameters are shown respectively.In the RI event,the higher average precipitation rate and the higher occurrence frequency of the short-term heavy rainfall both are centrally located in the northwest direction of the typhoon center,but their positions and areas change with stages.During the period of 0—24 h before RI starts,the area with high precipitation coverage rate expands from the typhoon inner core to outside region gradually.Meanwhile,the average precipitation rate and the short-term heavy rainfall coverage rate increase significantly after the onset of RI.From the period of 0—24 h before RI starts to the period of 0—24 h before RI ends,the average precipitation rate and the short-term heavy rainfall occurrence frequency are relatively high in front of the direction of typhoon movement.

关 键 词：台风 GPM多星集合降水反演产品 快速增强事件 降水率 

分 类 号：P458.1[天文地球—大气科学及气象学]