J4 ›› 2010, Vol. 28 ›› Issue (3): 285-290.

• 论文 • 上一篇    下一篇

祁连山近45 a 5 ~ 9 月日降水气候特征

魏锋1,2,王劲松1 ,李宝梓3 ,杨金虎4张小明4   

  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,甘肃兰州730020; 2. 甘肃省嘉峪关市气象局,
    甘肃嘉峪关735100; 3. 甘肃省人工影响天气办公室,甘肃兰州730020; 4. 甘肃省定西市气象局,甘肃定西743000
  • 收稿日期:2010-02-26 修回日期:2010-06-01 出版日期:2010-09-30 发布日期:2010-09-30
  • 作者简介:魏锋( 1967-) ,男,甘肃通渭人,硕士,高级工程师,主要从事天气气候研究及业务工作. E - mail: dxweifeng@126. com
  • 基金资助:

    国家科技攻关计划“西部开发科技行动”重大项目“祁连山空中云水资源开发利用研究”( 2004BA901A16 - 02 - 02) 资助

Climatic Characteristics of Daily Precipitation from May to 、September in Recent 45 Years in Qilian Mountains

1.Institute of Arid Meteorology,China Meteorological Administration,Key Laboratory of Arid Climatic Change
and Reducing Disaster of Gansu Province,Lanzhou 730020,China; 2. Jiayuguan Meteorological Bureau of Gansu
Province,Jiayuguan 735100,China; 3. Weather Modification Office of Gansu Province,Lanzhou 760020,China;
4. Dingxi Meteorological Bureau of Gansu Province,Dingxi 743000,China)   

  • Received:2010-02-26 Revised:2010-06-01 Online:2010-09-30 Published:2010-09-30

摘要:

:应用祁连山地区17 个测站1960 ~ 2004 年5 ~ 9 月逐日降水资料,统计逐年5 ~ 9 月不同量级的雨日数及对应的降水量,进而得到各站小雨和中雨以上日降水雨强,用区域平均值来代表祁连山地区整体的不同降水量级雨日数和雨强,用线性趋势系数及5 阶主值函数分析不同量级降水日数和雨强的变化趋势。用墨西哥帽状连续小波变换方法分析其周期变化情况。结果表明: 祁连山地区5 ~ 9月降水量与不同量级的雨日数的气候平均分布具有地理分布上的相似性,无论年降水量还是不同量级的雨日数,同纬度地区西侧明显多于东侧,祁连山东段多于西段,等值线呈北—东南走向。近45a,祁连山地区小雨日数呈下降趋势,中雨以上降水日数则呈上升趋势,而小雨雨强与中雨以上降水的雨强均呈增强态势,不同量级降水日数与雨强的共同作用使得5 ~ 9 月降水量与总雨日数呈相反变化趋势,即5 ~ 9 月降水量呈上升趋势,而总雨日数呈微弱下降趋势。小波分析发现,祁连山地区小雨日数有5 a 左右的变化周期,而中雨以上降水日数的周期变化较小雨日数周期变化明显复杂。

关键词: 祁连山区, 降水日数, 变化趋势, 小波分析

Abstract:

The different level rainy days and its homologous precipitation quantity are obtained by using the daily precipitation data from
May to September ( 1960 - 2004) of 17 stations in the Qilian Mountain area,thus,we know the daily precipitation intensity of light
rainfall and moderate rainfall( and more) at each station. Based on regional mean value of the different level rainy days and rainfall intensity
in Qilian Mountain area,the tendency of the different level rainy days and rainfall intensity was analyzed using linear trend coefficient
and 5 levels main value function. The results show that both precipitation and different level rainy days from May to September
in Qilian Mountain area presented more in the west side and less in the east side in the same latitude area,and more in the east and
less in the west part of Qilian Mountain. In recent 45 years,the light rainfall days was descending,but the moderate rainfall days was
ascending. The precipitation intensity of light rainfall and moderate rainfall ( and more) presented ascending trend too from May to September
in Qilian Mountain area. The morlet wave analysis show that the light rainfall days had a period of five years,but the period of
the moderate rainfall ( and more) days was more complex.

Key words: Qilian Mountain area, rainydays, trend, wave analysis

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