安徽地区暖季降水回波日变化及环境场特征研究  

Diurnal Variation and Environmental Characteristics of Precipitation Echo in Warm Season in Anhui

作　　者：郑佳玥 唐晓文 刘高平 张福贵[1,2] ZHENG Jiayue;TANG Xiaowen;LIU Gaoping;ZHANG Fugui(College of Electronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China;Key Open Laboratory of Atmospheric Sounding,China Meteorological Administration,Chengdu 610225,China;Anhui Meteorological Observatory,Hefei 230031,China)

机构地区：[1]成都信息工程大学电子工程学院,四川成都610225 [2]中国气象局大气探测重点开放实验室,四川成都610225 [3]安徽省气象台,合肥安徽230031

出　　处：《成都信息工程大学学报》2024年第2期200-207,共8页Journal of Chengdu University of Information Technology

基　　金：中国气象局创新发展专项资助项目(CXFZ2022J001)。

摘　　要：安徽地处华东,地势复杂且受夏季风影响,通常于暖季(5-8月)发生频繁且复杂的降水过程。为加深安徽地区降水特征及降水环境场特征的理解,利用安徽7部S-Band新一代天气雷达和ERA5再分析数据,对安徽及周边地区2016-2019年暖季降水回波时空变化及相关环境特征进行分析。结果表明:(1)安徽地区暖季降水回波发生频率的日变化呈双峰结构,降水多发时段为06时和16时前后。(2)凌晨降水峰值主要出现在6月,午后降水峰值主要出现在7、8月。(3)6月降水主要分布在皖南地区,由大面积浅对流及层状云构成。7、8月降水空间分布零散,无明显地域特征,多为局地深对流导致。(4)利用ERA5数据分析暖季降水峰值时刻的环境特征发现,有利于对流发生的热力条件主要出现在7、8月的午后,而5、6月的凌晨具有更有利的动力和水汽条件。各月降水峰值时刻的回波特征与环境场的特征存在很好的一致性。Anhui is located in East China,with complex terrain that is influenced by the summer monsoon,resulting in higher precipitation levels during the warm season(May to August).To deepen the understanding of precipitation characteristics and the precipitation environment in Anhui.Based on 7 S-Band new generation weather radars and ERA5 reanalysis data in Anhui Province,the temporal and spatial variations of warm season precipitation echoes and related environmental characteristics in Anhui and the surrounding areas during 2016-2019 were analyzed.The results showed that:(1)The diurnal variation of precipitation echo frequency in the warm season in Anhui showed a bimodal structure,with precipitation occurring mainly around 6:00 am and 4:00 pm.(2)The peak precipitation in the early morning mainly occurred in June,while the peak precipitation in the afternoon mainly occurred in July and August.(3)The precipitation in June was mainly distributed in the southern Anhui,which was composed of large shallow convection and stratiform clouds.The spatial distribution of precipitation in July and August was scattered,with no obvious regional characteristics,mostly caused by local deep convection.(4)Using ERA5 data to analyze the environmental characteristics of precipitation peak time in the warm season,it is found that the thermal conditions conducive to convection mainly appear in the afternoon of July and August,while the early morning of May and June have more favorable dynamic and water vapor conditions.The echo characteristics of precipitation peak time in each month are in good agreement with the characteristics of the environmental field.

关 键 词：降水回波 降水日变化 降水回波分类 环境场 雷达观测降水 

分 类 号：P445.1[天文地球—大气科学及气象学]