气象与环境学报2017，Vol.33Issue(6)：42-48,7.DOI:10.3969/j.issn.1673-503X.2017.06.006
安徽省不同地形条件下汛期短时强降水时空分布特征
Spatial-temporal distribution characteristics of short-time strong precipitation in the flood season under different terrains over Anhui province
摘要
Abstract
Based on the hourly precipitation data collected from automatic weather stations over Anhui province and hourly TBB (Black Body Temperature) data from FY-2E meteorological satellite,the spatial-temporal distribution characteristics of short-time strong precipitation ( STSP ) in the flood season under different terrains over Anhui province and their relationships with the mesoscale convective activities were analyzed and spatial-temporal charac-teristics of the extreme STSP were discussed preliminarily. Results showed that the STSP occurs mainly in the mountain area of southern Anhui,followed by Dabie Mountains and the hilly area in the mid-eastern part of Anhui province,while least in Huaibei plain under different terrains during 2011-2015. The monthly variation of the STSP frequencies presents a single-peak pattern,i. e. the highest frequency is in July,which is different from the circum-stances in the others months. Meanwhile,the pentad variation of the STSP frequency indicates a characteristic of multi-peaks and intermittency,that is,the STSP intensively occurs during the first pentad in June to the sixth pentad in August. Specifically,the pentad variation is largest in Huaibei plain and smallest in the mountain area of south-ern Anhui. In addition, the diurnal variations of the STSP frequency have a characteristic of single-peak and its peak value intensively appears in 15:00-19:00. Besides,the change characteristics of STSP frequency in the moun-tain area of southern Anhui and the hills in mid-eastern Anhui are similar to that averaged in Anhui province,i. e. the STSP mainly occurs in the afternoon. Although the STSPs in Huaibei plain and Dabie Mountains frequently ap-pear in the afternoon,they also occur between 06:00-07:00 and 02:00-03:00 as well as 10:00,that is,a multi-peak pattern of STSP frequency is indicated in above-mentioned areas. The extreme STSP is dispersedly distributed in Anhui province and does not intensively occur in any area,and its time-varying trait with statistical regularity is similar to that of the STSP. More specifically,the extreme STSPs most intensively occur during 16:00-19:00 in the mountain area of southern Anhui in July,especially during the fifth pentad in July. They also occur in the hills in mid-eastern Anhui in July with the relatively uniform pentad variation,as well as at 02:00 in Dabie Mountains. Furthermore,the extreme STSP in Huaibei plain mainly occurs in August especially for the sixth pentad and it shows a duration variation without evident peak value. Thus,a certain corresponding relationship is possibly indica-ted between the STSP and the mesoscale convective activities and shows a local dissimilarity.关键词
地形/短时强降水/中尺度对流/黑体温度Key words
Terrain/Short-time strong precipitation/Spatial-temporal distribution/Black Body Temperature ( TBB)分类
天文与地球科学引用本文复制引用
童金,魏凌翔,叶金印,周昆,袁松..安徽省不同地形条件下汛期短时强降水时空分布特征[J].气象与环境学报,2017,33(6):42-48,7.基金项目
中国气象局预报关键技术发展专项(YBGJXM(2017)06)、公益性行业(气象)科研专项(GYHY201406021)和中国气象局气象关键技术集成与应用项目(CMAGJ2014M25)共同资助. （YBGJXM(2017）
