J4 ›› 2010, Vol. 28 ›› Issue (2): 152-159.

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Comparison of Precipitation Resource Variation in East of Hexi Corridor

  

  1. 1.Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA, Institute of Arid Meteorology ,CMA, Lanzhou 730020, China2.Wuwei Meteorological Bureau of Gansu Province, wuwei 733000, China
  • Received:2009-10-28 Revised:2009-11-30 Online:2010-06-30 Published:2010-06-30

河西走廊东部降水资源变化特征比较

李玲萍1,2李岩瑛2奚立宗3   

  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.甘肃省武威市气象局,甘肃 武威 733000;3.甘肃省科技服务中心,甘肃 兰州 730020
  • 作者简介:李玲萍(1977-),女(汉族),甘肃定西人,工程师,主要从事天气预报和研究工作
  • 基金资助:

    甘肃省气象局第二批“青年优秀人才”项目资助

Abstract:

The daily rainfall data of 5 weather stations in east of Hexi corridor from 1971 to 2007 are used to analyze the temporal and spatial variation of precipitation events. The results show that there were three rainstorm events in east of Hexi corridor in recent 47 years, one occurred in the eastern mountain area of Hexi corridor and another two in the eastern plain areas in the 1980s and the 1990s. The total rainfall days, light rain, moderate rain and heavy rain days in the eastern plain areas of Hexi corridor presented decreasing trend, but in mountain areas they presented ascending trend. Total rainfall days decrease in plain areas was mostly due to the decreasing of light rain days there, while in mountain areas increase in total rainfall days was mostly due to the increasing of light rain events. The intensity of annual precipitation, light rain and heavy rain in the eastern plain and mountain areas of Hexi corridor presented significant increasing trend in recent 47 years, but moderate rain intensity decreased. The annual mean precipitation presented an increase trend in the eastern plain and mountain areas of Hexi corridor. The contribution of light rain and heavy rain to annual precipitation increased in plain areas, and the contribution of light rain and moderate rain to annual precipitation decreased slightly in mountain areas

摘要:

利用1961~2007年河西走廊东部5站(凉州区、民勤、永昌、古浪、乌鞘岭)逐日降水资料,分析了河西走廊东部平原区和山区不同强度降水的演变特征。结果表明:近47a来,河西走廊东部共出现3次暴雨天气,其中平原区出现2次,山区出现1次,都出现在20世纪80~90年代;河西走廊东部平原区总降水日数、小雨日、中雨日和大雨日都呈减少趋势,而山区总降水日数、小雨日、中雨日和大雨日都呈增加趋势;平原区总雨日的减少主要体现在小雨频率的减少,中雨的贡献最小,山区总雨日的增加主要体现在小雨频率的增加,大雨的贡献最小;河西走廊东部平原区和山区近47a来总降水强度和小雨、大雨降水强度都表现出一定增强趋势,而中雨强度都有变小的趋势;平原区和山区总降水强度增强主要体现在小雨、大雨降水强度的增强,中雨的贡献很小;河西走廊东部平原区和山区年平均降水量总体都呈增加趋势;平原区小雨、大雨的贡献率总体为增加趋势,中雨贡献率总体呈减少趋势;山区小雨、中雨的贡献率总体呈减少趋势,大雨贡献率总体为增加趋势;平原区年降水量增加主要是小雨和大雨的贡献,山区则主要是大雨的贡献。

关键词: 河西走廊东部, 平原区, 山区, 降水事件, 变化特征

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