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| 海河流域严重干旱500hPa信号场异常信号分析 | |
| 引用本文： | 严小林,杨扬,黄嘉佑,鲍振鑫.海河流域严重干旱500hPa信号场异常信号分析[J].水文,2013,33(1):27-31. |
| 作者姓名： | 严小林 杨扬 黄嘉佑 鲍振鑫 |
| 作者单位： | 1. 南京水利科学研究院,江苏南京210029;水利部应对气候变化研究中心,江苏南京210029 2. 水利部水利信息中心,北京,100053 3. 北京大学物理学院大气科学系,北京,100871 |
| 基金项目： | 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) |
| 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. |
| 关 键 词： | 干旱 严重少雨旬 500hPa信号场 EOF分析 海河流域 |
| 收稿时间： | 2011/12/30 0:00:00 |
Anomalies of 500hPa Signal Field during Meteorological Droughts in Haihe River Basin |
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| YAN Xiaolin,YANG Yang,HUANG Jiayou,BAO Zhenxin.Anomalies of 500hPa Signal Field during Meteorological Droughts in Haihe River Basin[J].Hydrology,2013,33(1):27-31. | |
| Authors: | YAN Xiaolin YANG Yang HUANG Jiayou BAO Zhenxin |
| Institution: | 1,2(1.Nanjing Hydraulic Research Institute,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing 210029,China;2.Research Center for Climate Change,MWR,Nanjing 210029,China;3.Water Resources Information Center,MWR, Beijing 100053,China;4.Department of Atmosphere Science,School of Physics,Peking University,Beijing 100871,China) |
| Abstract: | Based on the definition and analysis of 10-day precipitation drought events, the anomalies of the 500hPa signal field duringmeteorological droughts in the Haihe River Basin were investigated with 40 10-day precipitation drought events from 1961 to 2009, usingempirical orthogonal function analysis. The results showed that the relative variance contribution of the first mode is 35.3%, much higherthan those of other modes; and there are three abnormal areas in the 500hPa signal field: two negative ones and a wide stretches of positiveone. The abnormal spatial pattern of soohPa signal field meant that the Haihe River Basin is under the control of warm high, and the coldair and warm air can not meet over it, which would cause severe drought in the Haihe River Basin eventually. |
| Keywords: | drought 10-day precipitation drought event 500hPa signal field EOF analysis Haihe River Basin |
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