干旱区研究

干旱区研究 ›› 2012, Vol. 29 ›› Issue (5): 847-853.

• 气候及气候变化 • 上一篇    下一篇

祁连山区降水气候特征分析

陈志昆1,2, 张书余2, 雒佳丽1, 李照荣3, 孙1,4   

  1. 1. 兰州大学半干旱气候变化教育部重点实验室，甘肃 兰州 730020； 2. 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；
    3. 兰州中心气象台，甘肃 兰州 730020； 4. 中国人民解放军68210部队气象室，陕西 宝鸡 721001
  • 收稿日期:2011-09-26 修回日期:2011-10-15 出版日期:2012-09-15 发布日期:2012-10-09
  • 作者简介:陈志昆(1988-)，男，硕士，甘肃定西人，主要从事地形对降水的影响研究.E-mail：chenzhk09@lzu.cn
  • 基金资助:

    公益性行业（气象）科研专项经费 “地形复杂地区的MOS预报效果改进方法研究” 项目（GYHY201106010）

Analysis on the Change of Precipitation in the Qilian Mountains

 CHEN  Zhi-Kun1,2, ZHANG  Shu-Yu2, LUO  Jia-Li1, LI  Zhao-Rong3, SUN  Yan1,4   

  1. 1. Key Laboratory of Semiarid Climate Change of Ministry of Education, Lanzhou University, Lanzhou 730000, China;
    2. Gansu Province Key Laboratory of Arid Climate Change and Disaster Reduction; Key Open Laboratory 
    of Arid Climate Change and Disaster Reduction of China Meteorological Administration, Institute 
    of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
    3. Lanzhou Central Meteorological Observatory, Lanzhou 730020, China
    4. PLA 68210 Army Weather Forecast Office, Baoji 721001, China
  • Received:2011-09-26 Revised:2011-10-15 Online:2012-09-15 Published:2012-10-09

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被引次数

38

摘要： 利用祁连山区的逐时、逐日降水资料和山丹军马场大黄沟的云杉树轮宽度资料，研究祁连山区的降水时空变化和分布特征。研究发现：海拔高度对该地区降水有较大影响，并且降水主要发生在午后和夜间；近40 a来，该地区极端降水频次出现了增加趋势，增加幅度达1.25 d/10 a。利用一元二次回归模型重建这一区域200 a以来的降水历史序列。分析表明：整体上19世纪降水比20世纪更加丰富，20世纪初降水出现了突变特征，并逐渐趋于干旱，在20世纪20、30年代曾有严重的旱灾发生，这与该时期在我国北方大范围的干旱事件相一致。

关键词: 降水变率, 气候变化, 树木年轮, 海拔高度, 降水序列, 祁连山

Abstract: In this paper, the various trends and distributional characteristics of precipitation in the Qilian Mountains were studied using the data of hourly and daily precipitation in the mountains. Moreover, the tree-ring data of Picea asperata growing in the study area were used to analyze the response of tree-ring width to precipitation in the mountainous. A unitary linear regression model was used to develop a transfer equation so as to reveal the relationships between the standardized chronology of tree-ring width and the average precipitation at Minle Meteorological Station during the period from August to next July and the change of annual precipitation in recent 200 years. The results show that precipitation in 19th century was higher than that in 20th century. Drought occurred increasingly in 20th century, especially severe drought occurred in the 1920s and 1930s, such trend was consistent with that in north China. Precipitation in the Qilian Mountains was closely related to the altitude, and most precipitation occurred in the afternoon and nighttime. Flood season in the study area is in July and August. Moreover, the frequency of extreme precipitation was increased in recent decades, and the change of annual precipitation was not significant.

Key words: precipitation variability, climate change, tree-ring, altitude, precipitation series, Qilian Mountains