| 1961—2005年河西走廊东部极端降水事件变化研究 |
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| 引用本文： | 李玲萍,李岩瑛,钱莉,张惠玲.1961—2005年河西走廊东部极端降水事件变化研究[J].冰川冻土,2010,32(3). |
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| 作者姓名： | 李玲萍 李岩瑛 钱莉 张惠玲 |
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| 作者单位： | 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;甘肃省武威市气象局,甘肃,武威,733000;甘肃省武威市气象局,甘肃,武威,733000 |
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| 基金项目： | 甘肃省气象局第二批"青年优秀人才"项目资助 |
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| 摘 要： | 利用1961—2005年河西走廊东部5个气象站的逐日降水资料,研究了河西走廊东部近45 a极端降水事件变化的空间分布以及时间变化特征.结果表明:在空间分布上,年极端降水分布与地理位置、海拔密切相关,也与影响本地的天气系统有关.河西走廊东部极端降水总量、降水频数呈南-北走向,最大值出现在乌鞘岭,最小值出现在民勤;极端降水强度也呈南-北走向,但最强中心在古浪,最小在民勤.近45 a来极端降水总量和强度呈增加趋势,总量增加最大的是乌鞘岭,武威最小;强度增加最明显的是武威,最不明显的是古浪;年极端降水频数在古浪和民勤呈减少趋势,其它地区为增加趋势,降水频数增加最明显的也是乌鞘岭,降水频数减少最明显的是民勤.全球大幅度变暖水循环加快使得河西走廊东部年极端降水指数都呈增加趋势,其中年极端降水总量、年极端降水强度、年极端降水频数都是90年代增加最明显;极端降水指数在6~7 a和9~10 a周期上反映明显,在60年代年极端降水指数都发生了突变.
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| 关 键 词： | 河西走廊东部 极端降水事件 时空演变 |
The Changing Tendency of Extreme Precipitation in the East of Hexi Corridor in 1961-2005 |
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| LI Ling-ping,LI Yan-ying,QIAN Li,ZHANG Hui-ling.The Changing Tendency of Extreme Precipitation in the East of Hexi Corridor in 1961-2005[J].Journal of Glaciology and Geocryology,2010,32(3). |
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| Authors: | LI Ling-ping LI Yan-ying QIAN Li ZHANG Hui-ling |
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| Institution: | LI Ling-ping1,2,LI Yan-ying2,QIAN Li2,ZHANG Hui-ling2(1.Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Key Open Laboratory of Arid Change and Disaster Reduction of CMA,Institute of Arid Meteorology,China Meteorological Administration,Lanzhou Gansu 730020,China,2.Wuwei City Meteorological Bureau of Gansu Province,Wuwei Gansu 733000,China) |
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| Abstract: | Based on the data of daily precipitation from five meteorological stations in the east of Hexi corridor from 1961 to 2005,the thresholds of daily extreme precipitation are determined station by station.The characteristics of temporal and spatial distributions of extreme precipitation events in the east of Hexi corridor are studied for the recent 45 years.It is found that spatially,the total extreme precipitation and the extreme precipitation frequency change from north to south,with the maximum in Wushaolin... |
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| Keywords: | east of Hexi corridor extreme precipitation temporal and spatial evolution |
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