J4 ›› 2008, Vol. 26 ›› Issue (2): 48-52.

• 论文 • 上一篇    下一篇

甘肃省近50 a夏季极端强降水量的气候特征

张小明1, 2 ,杨金虎1 ,高伟东2 ,全志伟2   

  1. 1. 中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点开放实验室, 甘肃 兰州 730020; 2. 甘肃省定西市气象局,甘肃 定西 743000
  • 收稿日期:2008-01-21 修回日期:2008-05-05 出版日期:2008-06-30 发布日期:2008-06-30
  • 作者简介:张小明,男,甘肃岷县人,工程师,主要研究方向为短期气候预测. E-mail: qxjzxm@sina. com
  • 基金资助:

    干旱气象科学研究基金项目( IAM200609)资助

Clima te Character itic of Summer Extremely Heavy Prec ip ita tion over Gan su Prov ince in Recen t Ha lf Cen tury

ZHANG Xiaoming1,2 , YANG J inhu 2, GAO Weidong2 , QUAN Zhiwei2   

  1. 1. Institute of A rid M eteorology, CMA, Key Laboratory of A rid Clim ate Change and Reducing D isaster of Gansu Province,Key Laboratory of A rid Clim ate Change and D isaster Reduction of CMA, Lanzhou 730020, China;2. D ingx iM eteorological B ureau of Gansu Province, D ingxi 743000, China
  • Received:2008-01-21 Revised:2008-05-05 Online:2008-06-30 Published:2008-06-30

摘要:

利用甘肃省1960~2006年59个台站逐日降水资料,根据百分位值法定义了不同台站的极端强降水阈值,统计出了夏季(6~8月)逐年逐站极端强降水量,并进行了时空特征诊断。结果表明:一致性异常分布是甘肃省夏季极端强降水量的最主要空间模态;夏季极端强降水量的异常空间分布可分为陇南型、陇中型、河西西部型、河西东部型及陇东型5个关键区;在5个关键区中,陇南区、陇中区近47 a来夏季极端强降水量表现出减少趋势,河西东部区与陇东区表现出增加趋势,而河西西部区却经历了少—多—少的抛物线型变化;另外从周期分析来看,甘肃省夏季极端强降水量近47 a来在大多数分区存在11~13 a和6~8 a的振荡周期。

关键词: 甘肃, 极端强降水, 时空特征

Abstract:

Using daily p recip itation data in 59 stations of Gansu p rovince during 1960 - 2006, extremely heavy p recip itation thresholds  are determined for different stations, and the temporal and spatial distribution of summer extremely heavy p recip itation is diagnosed in recent half century. The results show that the consistent anomaly distribution is main spatial mode for summer heavy p recip itation in Gansu p rovince, and the spatialmode is divided into five key areas: the Longnan area, the Longzhong area, the west of Hexi area, the east of Hexi and the Longdong area, respectively. The extremely heavy p recip itation p resented decreasing tendency in the Longnan and Longzhong areas, and increasing tendency in the east of Hexi and Longdong areas, but it came through few - more - few change in the west of Hexi area. From period analysis, the period vibration of 11 - 13 a and 6 - 8 a disp layed clearly in most key areas.

Key words: heavy precip itation, temporal and spatial characteristic

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