摘要
基于严重少雨旬的定义,分析海河流域1961~2009年严重少雨旬的分布特征,进而对汛期40个典型严重少雨旬的500hPa信号场进行经验正交分解（EOF分析）。结果表明：EOF第一模态的方差贡献率达到35.3%,远高于其他模态;第一模态呈现出2个负异常区和1个正异常区,在对应的环流背景下,海河流域受暖性高压控制,高纬冷空气及低纬暖湿气流难以到达流域上空交绥,持续高温少雨造成流域严重干旱。
Based on the definition and analysis of 10-day precipitation drought events, the anomalies of the 500hPa signal field during meteorological droughts in the Haihe River Basin were investigated with 40 lO-day precipitation drought events from 1961 to 2009, using empirical orthogonal function analysis. The results showed that the relative variance contribution of the first mode is 35.3%, much higher than those of other modes; and there are three abnormal areas in the 500hPa signal field： two negative ones and a wide stretches of positive one. The abnormal spatial pattern of soohPa signal field meant that the Haihe River Basin is under the control of warm high, and the cold air and warm air can not meet over it, which would cause severe drought in the Haihe River Basin eventually.
出处
《水文》
CSCD
北大核心
2013年第1期27-31,共5页
Journal of China Hydrology
基金
国家973重点基础研究发展计划项目(2010CB951103)
国家十二五科技支撑计划项目(2012BAC21B01
2012BAC19B03)
水利部公益性行业专项经费资助项目(200801001
201101015)
关键词
干旱
严重少雨旬
500hPa信号场
EOF分析
海河流域
drought
lO-day precipitation drought event
500hPa signal field
EOF analysis
Haihe River Basin
