干旱区研究

干旱区研究 ›› 2012, Vol. 29 ›› Issue (2): 296-302.

• 气候变化 • 上一篇    下一篇

近50 a甘肃省夏季日极端降水频数与强度变化特征

 马中华, 张勃 , 王兴梅 , 邹悦 , 张亚宁   

  1. 西北师范大学 地理与环境科学学院，甘肃 兰州 730070
  • 收稿日期:2011-02-20 修回日期:2011-07-25 出版日期:2012-03-15 发布日期:2012-04-10
  • 作者简介:马中华(1985-)，男，甘肃民勤人，硕士研究生，主要从事气候变化、土地利用与土地覆被变化研究. E-mail: mazhonghua1122@126.com
  • 基金资助:

    国家自然科学基金项目（40961038）；公益性行业（气象）科研专项（GYHY200806021-07）；中国科学院知识创新工程重要方向项目(KZCX2-YWQ10-4)；生态经济学甘肃省级重点学科(5001-063)

Analysis on Change of Daily Extreme Precipitation Frequency and Intensity in Gansu Province in Summer during the Period of 1959-2008

 MA  Zhong-Hua, ZHANG  Bo , WANG  Xing-Mei , ZOU  Yue , ZHANG  Ya-Ning   

  1. College of Geography and Environmental Sciences, Northwest Normal University, Lanzhou 730070, China
  • Received:2011-02-20 Revised:2011-07-25 Online:2012-03-15 Published:2012-04-10

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摘要： 基于甘肃省近50 a夏季日降水量数据，借助ArcGIS 9.2和Matlab 7.0数据软件平台，运用复值Morlet小波分析及Mannkendall检验法，分析甘肃省夏季日极端降水频数和强度的周期及空间分布特征。结果表明：① 极端降水频数主要存在19 a和8 a周期，极端降水强度主要存在11 a和19 a周期；② 夏季极端降水量与夏季降水量的空间分布在东南部地区有明显的差异；③ 极端降水频数呈减少趋势，而极端降水强度呈增加趋势。

关键词: 极端降水, 频数, 强度, 小波分析, 突变检验, 甘肃

Abstract: In this paper, the changes of periodic and distributional characteristics of daily extreme precipitation frequency and intensity in summer were analyzed using the ArcGIS and Matlab 7.0 data software platform, complex Morlet wavelet analysis and Mann-Kendall test based on the data of daily precipitation in Gansu Province in summer during the period of 1959-2008. The results show that there were mainly the 19-year and 8-year periodicities of extreme precipitation frequency and mainly the 11-year and 19-year ones of extreme precipitation intensity. There were also the obvious differences in extreme precipitation and spatial distribution of total precipitation in summer in the southeastern region of the province. Moreover, the extreme precipitation frequency was in a decreasing trend, but the extreme precipitation intensity was in an increasing trend.

Key words: extreme precipitation, frequency, intensity, wavelet analysis, Mann-Kendall test, Gansu Province