摘要
利用河西走廊西部8个气象站1960～2010年的逐日有效降水(日降水量≥0.1mm)资料,研究了河西走廊西部近51a极端降水事件变化的时空分布特征及变化趋势。结果表明:在河西走廊西部只要出现中～大雨或以上降水就算极端强降水;在空间分布上,河西走廊西部极端强降水阈值自西南向东北逐渐减小,极端降水总量分布与该区域年降水量的空间分布相似,极端降水指数倾向率空间分布很不均匀;在时间分布上近51年来河西走廊西部年极端降水总量和年极端降水强度均呈显著增加的趋势,极端降水频数增加趋势不明显,极端降水指数在3～5a和10～13a周期上反映明显,在60年代极端降水指数均发生了突变。
Data of daily effective precipitation（daily precipitation over 0.1mm） of eight weather stations in western Hexi Corridor were used to research the spatial distribution of the change in extreme precipitation events in the western Hexi Corridor since recent 51 years,as well as the time-varying characteristics.The results show that moderate or heavy rain occured in the western Hexi Corridor means extreme heavy precipitation.In spatial distribution,the threshold of extreme heavy precipitation in western Hexi Corridor was gradually reduced from southwest to northeast.The spatial distribution of total extreme precipitation amount was similar to the annual precipitation.Spatial distribution of the extreme precipitation index tendency rate was very uneven.During the 51 years,the amount and intensity of extreme precipitation in time distribution obviously showed the increasing tendency,and the frequency of extreme precipitation increased slowly.The cycle of extreme precipitation indices were 3~5 and 10~13 obviously,and the extreme precipitation index suddenly changed in the 60s of last century.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2013年第10期100-106,共7页
Journal of Arid Land Resources and Environment
基金
"结构预测方法在甘肃西部强降水预报中的应用"(2012-04)资助
关键词
极端强降水事件
时空分布特征
突变分析
河西走廊西部
extreme strong rainfall events
Space-time distribution characteristics
mutation analysis
western Hexi Corridor
