首页 | 官方网站   微博 | 高级检索  
     

1961-2018年四川盆地夜雨特征分析
引用本文:范江琳,曹萍萍,冯良敏,等.1961-2018年四川盆地夜雨特征分析[J].高原山地气象研究,2019,39(4):24-30.
作者姓名:范江琳  曹萍萍  冯良敏  
作者单位:1. 四川省气象台,成都 610072;
基金项目:四川盆地夏季昼雨夜雨对比分析(川气课题2014-青年-07)
摘    要:本文根据1961~2018年5~9月20~08、20~20时降水数据,和2010~2018年逐小时降水资料,利用EOF等方法分析了四川盆地夜雨率、夜雨强度及夜雨频次的时空变化特征,结论如下:(1)夜雨率EOF展开的第一特征向量(占总方差的17.1%)显示四川盆地为一致的变化特征,夜雨强度EOF第一特征向量(占21.5%)为以105.5°E为界的经向偶极型空间分布。(2)夜雨高频次中心位于雅安、乐山和眉山3市的交界区域,盆地西部沿山,盆地西南部和南部为次高频区,盆地东北部和中部为低频区。降水频次随时间呈明显的单峰特征,02~05时为峰值时段。(3)小雨至大雨逐日、月夜雨率与夜雨强度呈反位相变化,夜雨率先下降后上升,夜雨强度先上升后下降,7、8月为过渡时段。各量级夜雨率、夜雨强度逐年变化曲线呈波状分布,无明显上升或下降趋势。 

关 键 词:夜雨率    夜雨强度    夜雨频次    EOF
收稿时间:2019-12-02

Analysis of Night Precipitation Characteristics in Sichuan Basin in Recent 58 Years
Affiliation:1. Sichuan Meteorological Observatory,Chengdu 610072,China;2. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072,China
Abstract:Based on 20-08,20-20 precipitation data from May to September in 1961-2018,and hourly precipitation data from 2010 to 2018,the spatiotemporal variations such as the rate,intensity and frequency of night precipitation in Sichuan Basin are analyzed by using the EOF and other methods.The results show that:(1)The night precipitation rate reveals a consistent variational feature in Sichuan Basin from the EOF first eigenvector,which accounts for 17.1% of the total variance.And the EOF first eigenvector(21.5%)of night precipitation intensity reveals a meridional dipole spatial distribution with 105.5 ° E as the boundary.(2)The high frequency center of night precipitation is located at the junction of Ya'an,Leshan and Meishan.The sub-high frequency regions are in the southwest and south of Sichuan Basin as well as along the west mountains,while the middle and northeast of Sichuan Basin are the lower frequency areas.In addition,the frequency of precipitation characterized in a single peak time from 02 to 05.(3)From light rain to heavy rain,the daily and monthly variation of night precipitation rate and intensity show that:the night precipitation rate first decreases and then rises,while the intensity first rises and then decreases,with transitional period from July to August.In addition,the annual variation shows a wave-like distribution,without obvious upward and downward trend. 
Keywords:
本文献已被 CNKI 等数据库收录!
点击此处可从《高原山地气象研究》浏览原始摘要信息
点击此处可从《高原山地气象研究》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号