干旱区研究

干旱区研究 ›› 2018, Vol. 35 ›› Issue (2): 404-411.doi: 10.13866/j.azr.2018.02.19

• 气候及气候资源 • 上一篇    下一篇

河西走廊东部主要相态降水日的气候特征

杨晓玲1,2, 汪宗成3, 杨梅1, 王鹤龄2   

  1. 1.甘肃省武威市气象局,甘肃 武威 733099;
    2.中国气象局兰州干旱气象研究所,甘肃 兰州 730020;
    3.甘肃省天祝县气象局,甘肃 天祝 733299
  • 收稿日期:2017-05-22 修回日期:2017-09-28 出版日期:2018-03-15 发布日期:2025-11-17
  • 通讯作者: 王鹤龄. E-mail: wangheling1978@126.com
  • 作者简介:杨晓玲(1971-),女,高级工程师,理学学士,主要从事天气预报及气候变化研究.E-mail: wwqxj6150343@163.com
  • 基金资助:
    国家自然基金(41775107,41305134)和甘肃省气象局第七批“十人计划”共同资助

Climatic Characteristics of Rainfall and Snowfall Days in the East Hexi Corridor

YANG Xiao-ling1,2, WANG Zong-cheng3, YANG Mei1, WANG He-ling2   

  1. 1. Wuwei Meteorological Bureau,Wuwei 733099,Gansu,China;
    2. Lanzhou Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730020,Gansu ,China;
    3. Tianzhu County Meteorological Bureau,Tianzhu 733299,Gansu,China
  • Received:2017-05-22 Revised:2017-09-28 Published:2018-03-15 Online:2025-11-17

PDF (PC)

0

赞

摘要： 根据1960—2016年河西走廊东部5个气象站逐日降水观测资料,采用气候统计学方法分析了该区域雨、雪日的时空变化和异常性等特征,揭示河西走廊东部雨、雪日变化规律。研究表明:受海拔高度、地形地貌以及天气系统的影响,河西走廊东部年平均雨、雪日的空间分布从东北向西南呈增多趋势。各地月雨日的变化比较一致,高峰值在7—8月;各地雪日的月变化相对一致,高峰值在3月。各地雨、雪日年及年代变化有所不同,但总体呈增多趋势,年雨、雪日的时间序列分别存在着5～7 a、6～8 a的准周期变化。各地年雨、雪日的异常性比较一致,正常年份发生概率分别在64.9%～70.2%、66.7%～73.7%,依次迅速向两端递减。

关键词: 雨日, 雪日, 气候倾向率, 时空变化, 河西走廊东部

Abstract: According to the observed daily precipitation data from five meteorological stations in the east Hexi Corridor during the period of 1960-2016,the spatiotemporal changes,extreme values and abnormal variations of rainfall and snowfall days were systematically analyzed and summarized with climatic statistic method.The results revealed that the annual rainfall and snowfall days increased from the northeast to the southwest because of the influence of altitude,topography and weather system,and the difference of snowfall days between the north and the south was much higher than that of rainfall days.Monthly variation of rainfall days was consistent,high value occurred during the period from July to August,there was no rainfall during the period from December to next January or February.Monthly variation of snowfall days was relatively consistent,high value occurred in March,and there was no snowfall during the period from July to August.Annual and inter-annual variations of rainfall and snowfall days were different,but they were generally in an increase trend,climate trend coefficients were not examined by significance level test,and the increase trend was not significant.Time series of annual rainfall and snowfall days revealed that there were the 5-7 year and 6-8 year quasi-periodic variations respectively,and they were at the significant level of reliability α=0.05 test.Anomalies of annual rainfall and snowfall days were consistent,normal years occurrence probabilities were 64.9%-70.2% and 66.7%-73.7% respectively.Occurrence probabilities of abnormal years of rainfall and snowfall days were 29.8%-35.1% and 26.3%-33.3% respectively,and very many or very few rainfall and snowfall days would cause the serious effects on industrial and agricultural production and safety of life and property.This study could provide the scientific basis for preventing flood and drought disasters,scientifically utilizing water resources and conserving ecological environment,and could also provide the reference for studying climate change.

Key words: rainfall day, snowfall days, climate tendency, spatiotemporal change, the east Hexi corridor