江西宜丰县2012—2022年短时强降水的雷达回波特征分析  

Analysis of Radar Echo Characteristics Short-term Heavy Precipitation in Yifeng,Jiangxi Province From 2012 to 2022

作　　者：洪丽霞[1] HONG Lixia(Yifeng County Meteorological Bureau,336300,Yichun,Jiangxi,PRC)

机构地区：[1]宜丰县气象局,江西宜春336300

出　　处：《江西科学》2024年第5期1047-1054,共8页Jiangxi Science

基　　金：国家自然科学基金面上项目(41975001);江西省气象科技项目(JX2022ZHFXPC08)。

摘　　要：为了做好宜丰县短时强降水“1小时风险叫应”标准研究,使用宜丰雨量、江西雷达拼图等资料,采用统计学、雷达气象学等原理和方法,对宜丰县2012—2022年短时强降水进行分析,结果表明:1)2012—2022年18个气象观测站共出现短时强降水273站次。最多的是板坑水库(19次),最少的是双峰林场(8次);2)在大片絮状回波带中(层状云与积状云混合),存有大于45 dBZ的短带回波,在短带回波覆盖地方,多处会出现短时强降水。絮状回波带大于45 dBZ的短带回波面积都在500 km^(2)以上;3)块状单体回波尺度较小,基本孤立存在,回波强度CR在50~60 dBZ。有时几个块状单体回波聚在一起,但之间有间隔,有时块状单体回波存在于大范围絮状回波团中。块状单体回波在小时平均回波图上的反映差距较大;4)雷暴回波群的45 dBZ回波面积都≥100 km^(2),这个指标为识别短时强降水提供量化阈值。研究结果对宜丰短时强降水“1小时风险叫应”研究具有指导意义。In order to study the“1-hour risk response”standard for short-term heavy precipitation in Yifeng county,the data of Yifeng rainfall and Jiangxi radar mosaic are used to analyze the shortterm heavy precipitation in Yifeng county from 2012 to 2022 using principles and methods such as statistics and radar meteorology.The results show that:1)Short-term heavy precipitation occurred 273 times across 18 meteorological observation stations from 2012 to 2022.The highest frequency was at Bankeng Reservoir(19 times),and the lowest was at Shuangfeng Forest Farm(8 times);2)The flocculent echo band contains short band echoes greater than 45 dBZ in large flocculent echo bands(a mixture of stratiform and cumulus clouds).In areas covered by short band echoes,shortterm heavy precipitation occurs in multiple locations.The area of short-banded echoes greater than 45 dBZ in the flocculent echo exceeds 500 km^(2)above;3)Block-shaped individual echoes have a smaller scale,and are mostly isolated,with echo intensity CR ranging from 50 to 60 dBZ.Sometimes several block-shaped echoes gather together with gaps between them,or they exist within larger flocculent echo groups.Considerable variability is shown in the reflection of block-shaped individual echoes on the hourly average echo map;4)Thunderstorm echo band(group),with a 45 dBZ echo area in thunderstorm echo group being≥100 km^(2),provides a quantitative threshold for identifying short-term heavy precipitation.The research results provide guidance for the research on the“1-hour risk response”of short-term heavy precipitation in Yifeng.

关 键 词：短时强降水 1小时风险叫应 回波特征 小时平均回波图 

分 类 号：P458[天文地球—大气科学及气象学]