主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2020, Vol. 36 ›› Issue (1): 51-57.doi: 10.3969/j.issn.1673-503X.2020.01.007

• 论文 • 上一篇    下一篇

1961—2017年广西区域性暴雨过程变化特征

李艳兰(),黄卓,何洁琳,覃卫坚   

  1. 广西壮族自治区气候中心, 南宁 530022
  • 收稿日期:2018-11-12 出版日期:2020-02-28 发布日期:2019-12-12
  • 作者简介:李艳兰,女, 1972年生,高级工程师,主要从事气候监测评价和气候变化研究, E-mail:gxnnyanlan@163.com
  • 基金资助:
    广西自然科学基金(2017GXNSFBA198165);国家自然科学基金(41565005);广西科学研究与技术开发计划项目(桂科攻1598071-14);广西气象局延伸期气候预测创新团队项目

Characteristics of the regional rainstorm processes in Guangxi during 1961-2017

Yan-lan LI(),Zhuo HUANG,Jie-lin HE,Wei-jian QIN   

  1. Guangxi Climate Center, Nanning 530022, China
  • Received:2018-11-12 Online:2020-02-28 Published:2019-12-12

摘要:

利用1961—2017年广西91个气象观测站逐日降水量资料,通过定义广西区域性暴雨,采用线性趋势计算、低通滤波等方法,统计分析了广西区域性暴雨过程的变化特征。结果表明:广西区域性暴雨过程发生频率较高,全年各月均可有区域性暴雨过程出现,5—8月为多发期,出现次数占全年总数的74.2%;持续天数在5 d以上的区域性暴雨过程主要出现在6—8月,以6月最多。近57 a,广西年及秋季区域性暴雨过程频次呈显著增加趋势,20世纪90年代以来区域性暴雨过程总体偏多、强度偏强,暴雨范围在30站以上的过程明显增多;近10 a秋季过程频次偏多、强度偏强特征尤为明显。

关键词: 区域性暴雨, 低通滤波法, 线性趋势

Abstract:

Base on the daily precipitation data from 91 meteorological stations in Guangxi from 1961 to 2017, the variation characteristics of regional rainstorm processes were analyzed using statistical methods such as a linear trend, a low pass filter analysis and a definition of regional rainstorm.The results show that there is a high frequency of rainstorm processes in Guangxi that happen every month of each year.74.2% of total rainstorm cases in a year occur mainly in May to August, and those cases persisting beyond 5 days mostly happen between June and August especially in June.The frequency of regional rainstorm processes in each year or in fall tends to show a remarkable increasing trend from 1961 to 2017.The rainstorm cases happen more frequently after 1990s than before, and the processes that the range of rainstorm cases extends to over 30 stations increase more significantly.In the autumns of recent ten years, both of the rainstorm frequency and intensity increase considerably.

Key words: Regional rainstorm, Low pass filter analysis method, Linear trend method

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