江淮流域暖切变型暖区暴雨的客观识别与分析  

Objective Identification and Analysis of Warm-Sector Rainstorm with Warm-Shear Pattern over Yangtze-Huaihe River Region

作　　者：宋柳贤 张玲[1] 马茜雅 董甫 智协飞[1] SONG Liuxian;ZHANG Ling;MA Xiya;DONG Fu;ZHI Xiefei(Key Laboratory of Meteorological Disaster,Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044;Air Traffic Management Bureau,Anhui Province in East China Branch,Hefei 230051)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心,南京210044 [2]华东地区空中交通管理局安徽分局,合肥230051

出　　处：《大气科学》2023年第6期1709-1722,共14页Chinese Journal of Atmospheric Sciences

基　　金：国家重点研发计划重点专项2017YFC1502002。

摘　　要：暖切变型暖区暴雨(WSWR)是存在暖式切变线作为天气背景的暖区暴雨(WR)类型。本研究基于WR与切变线的定义,综合中尺度暴雨团、锋面、切变线等客观识别标准,利用中国自动站与CMORPH降水产品融合的逐小时网格数据集以及ERA5再分析资料对2010~2017年的江淮流域WSWR进行客观识别与验证。8年共确定WR雨团1268个,WSWR雨团451个,其高频区位于皖赣鄂三省交界处及江浙沿海区域,且WSWR雨团与WR雨团的频次大值区分布基本一致。WSWR雨团多出现在6月中旬到7月中旬,此期间WR雨团中40%以上是WSWR雨团,雨团出现的位置随主雨带一致向北推进,其平均最大降水量为29 mm h^(-1)。WSWR出现频次的日变化呈现双峰结构,分别出现在08~13时(北京时,下同)、20~22时,雨团的小时降水量高峰值主要出现在午后(13~19时)和清晨(01~05时)。This paper investigates the warm-sector rainstorm(WR)and warm-shear pattern(WSWR)over the Yangtze–Huaihe River region.Herein,the merged rain gauge-satellite gridded hourly precipitation dataset and ERA5 reanalysis data are utilized to identify the WSWR over the Yangtze–Huaihe River basin(YHRB)from 2010 to 2017 based on the WR and shear line definitions and objective identification criteria of the mesoscale rainstorm cluster,front,and shear line.A total of 1268 WR clusters were identified over the 8 years.Accordingly,451 WSWR clusters among the total WR clusters frequently occurred over the junction of the Anhui,Jiangxi,and Hubei provinces and in the coastal areas of the Jiangsu and Zhejiang provinces.The WSWR clusters exhibited a horizontal distribution similar to the WR clusters over the YHRB.These clusters mainly occurred from mid-June to mid-July.During this period,the WSWR clusters with an average hourly precipitation of 29 mm accounted for more than 40%of the total WR clusters and gradually moved northward,consistent with the main rainfall belt migration.The WSWR cluster occurrence showed a considerable diurnal variation,with one peak from morning to early afternoon[0800–1300 BJT(Beijing time)]and another after sunset(2000–2200 BJT).The maximum precipitation of the WSWR clusters was observed in the afternoon(1300–1900 BJT)and early morning(0100–0500 BJT).

关 键 词：暖区暴雨 暖切变 江淮流域 客观识别 

分 类 号：P458[天文地球—大气科学及气象学]