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陇东塬区不同量级降水的气候变化特征

崔世杰1毛玉琴2   

  1. 1. 南京信息工程大学,江苏 南京 210044;
    2. 甘肃省张掖市气象局,甘肃 张掖 734000
  • 出版日期:2013-12-14 发布日期:2013-12-14
  • 通讯作者: 毛玉琴(1964 - ),女,甘肃山丹县人,高工,主要从事灾害性天气预报与研究. E - mail:997511564@ qq. com
  • 作者简介:崔世杰(1993 - ),男,甘肃山丹县人. E - mail:314129454@ qq. com

Climatic Changes of Different Level Precipitation in the East of Gansu Province

CUI Shijie1MAO Yuqin2   

  1. 1. College of Atmospheric Sciences,Nanjing University of Information Science & Technology,Nanjing 210044,China;
    2. Zhangye Meteorological Bureau of Gansu Province,Zhangye 734000,China
  • Online:2013-12-14 Published:2013-12-14

摘要:

利用西峰站 1951 ~2010 年逐日降水观测资料,根据划分的雨量级别分析了近 60 a 来陇东塬区西峰年降水量及分级降水雨量谱的气候变化特点,并利用累积距平法和 Mann - Kendall 方法对气候突变进行分析检测。结果表明,近 60 a 西峰的年降水量有明显的下降趋势,其中小雨、中雨、大雨均为正贡献,暴雨为负贡献。而 1986 ~2010 年期间年降水有弱的上升,主要是大雨级的雨量增大、雨日增多和雨强增强所致;进一步分析得出,上述变化仍属于年际变化范畴,因此不能说突变已经发生,但有上升迹象。

关键词: 陇东, 雨量谱, 气候变化趋势

Abstract:

Using the daily precipitation observational data at Xifeng meteorological station located in the east of Gansu Province from
1951 to 2010,the climate change characteristics of the precipitation and its spectrum in recent 60 years were analyzed,and the climate
mutation of precipitation was detected by using cumulative anomaly and Mann - Kendall test. The results show that the annual precipi-
tation presented an obviously decreasing trend,and light,moderate and heavy rain had positive contribution to the total rainfall,while
rainstorm had negative contribution in recent 60 years. The annual precipitation displayed a weak increasing trend during 1986 -2010
due to the increasing rainfall,increasing rain days and enhancing rainfall intensity of heavy rain. These changes still belong to the cate-
gory of annual variation. Therefore,it is believed that the mutation of precipitation hadn’t occurred yet,but the precipitation since
1986 showed increasing signs.

Key words: the east of Gansu, precipitation spectrum, climate changetendency  

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