|
|
|
| Analysis of extreme threshold and echo characteristics of shortterm heavy precipitation in Jiangxi Province |
| Ma Zhongyuan1, Chen Baofa2, Zhou Xiaoxiang3, Ji Guiping2 |
1. Jiangxi Institute of Meteorological Sciences,Nanchang 330096;
2. Jingdezhen Meteorological Bureau,Jingdezhen 333000;
3. Jiangxi Meteorological Data Center,Nanchang 330096 |
|
|
|
|
Abstract In order to better study the extreme nature of short-term heavy precipitation.The article uses data on the frequency and magnitude of short-term heavy precipitation (≥30 mm/h) in Jiangxi from 2012 to 2021,and uses the percentile algorithm to analyze the extreme threshold of short-term heavy precipitation in Jiangxi.The results showed that the extreme threshold for short-term heavy precipitation in Jiangxi is ≥80 mm/h ±2％ for national stations and ≥90 mm/h ±2％ for regional stations.The radar echo characteristics of extreme short-term heavy precipitation in Jiangxi Province are characterized by the presence of multiple flocculent echo bands with different directions,with a combined reflectivity of 50 dBZ to 55 dBZ (up to 60 dBZ in super strong cases).The area of strong echoes with a reflectivity of ≥45 dBZ is ≥300 km2,and the slow or minimal movement of strong echoes maintains the heavy precipitation,resulting "ultra short time heavy precipitation" (≥10 mm/10 min).The slow movement of elliptical strong echoes with a reflectivity of 55 dBZ is also the echo system that causes extreme heavy precipitation.The research results have determined the extreme threshold for short-term heavy precipitation,providing an analytical basis for carrying out extreme heavy precipitation in Jiangxi.
|
|
Received: 14 October 2024
|
|
|
|
|
|
| [1] |
范元月,罗剑琴,张家国,等.宜昌极端短时强降水中尺度对流系统特征分析[J].气象,2020,46(6):776-791.
|
| [2] |
张金霞,张云惠,于碧馨,等.基于多源资料的乌鲁木齐市两次极端短时强降水对比分析[J].沙漠与绿洲气象,2021,15(3):10-19.
|
| [3] |
姜玉印,卢楚翰,范元月,等.宜昌一次致灾极端短时强降水成因分析[J].气象科学,2020,40(2):232-240.
|
| [4] |
胡燕平,郭贺奇,武威,等.沙颍河流域一次极端短时强降水的中尺度特征分析[J].气象与环境科学,2021,44(4):63-71.
|
| [5] |
肖蕾,郭晓超,刘红双,等.C波段双偏振雷达在正安碧峰极端短时强降水中的初步应用[J].中低纬山地气象,2022,46(3):1-8.
|
| [6] |
郑卡妮.2023年乐平港边极端短时强降水事件分析[J].气象水文海洋仪器,2024,41(3):76-79,83.
|
| [7] |
苏俐敏,夏文梅,马中元,等.2012年江西宜春四类短时强降水特征分析[J].气象科学,2014,34(6):700-708.
|
|
|
|
2024, Vol. 41 
