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投稿时间:2008-05-13 修订日期:2008-11-10
投稿时间:2008-05-13 修订日期:2008-11-10
中文摘要: 利用三江源地区14个站1961—2005年逐月降水资料,对全区近45年夏季降水异常的时空特征
及与大气环流异常的关系进行了分析。结果表明,近45年来,三江源地区的夏季降水量具有
良好的空间一致性,总体呈微弱的减少趋势,减少幅度为9mm/45a;三江源地区经历了5个干
、湿交替的阶段,存在较明显的准2年、准4~6年的振荡周期,自1980年代中期后12~14年
左右的周期信号较强;1968、1979及1986年是3个明显的气候突变点,小波分析结果与降水
序列大—小—大—小—大的变化趋势及突变检验存在良好的对应关系。环流分析表明,三江
源地区夏季旱、涝年份的大气环流配置形势在高度距平场、风场和温度场均呈反向变化,可
作为强信号,对三江源夏季降水的异常预测起指示作用。
Abstract:The spatial and temporal features and circulation characteristics of summer prec
ipitation anomaly in Sanjiangyuan are investigated on the basis of the monthly r
ainfall data at 14 stations from 1961 to 2005. The results show that the spatial
distribution of summer precipitation has a good coherence in Sanjiangyuan, and
on the whole has decreasing trend in the last 45 years. In addition, Morlet wave
let analysis indicates that there were quasi two year, quasi four to six y
ear periodi
c oscillations in the summer precipitation, and three sudden changes in the year
s of 1968, 1979 and 1986 respectively. The above results indicate that the wet/d
ry years of climate in
Sanjiangyuan are closly related with the height field, temperature field, and w
ind field, the relations can obviously be as factors for precipitation’s foreca
st.
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引用文本:
刘彩红,朱西德,石顺吉,徐明,2009.“三江源”夏季降水异常与大气环流异常的关系[J].气象,35(7):39-45.
Liu Caihong,Zhu Xide,Shi Shunji,Xu Ming,2009.Analysis of Summer Precipitation Anomaly and Atmospheric Circulation in “Sanjiangyuan” Region[J].Meteor Mon,35(7):39-45.
刘彩红,朱西德,石顺吉,徐明,2009.“三江源”夏季降水异常与大气环流异常的关系[J].气象,35(7):39-45.
Liu Caihong,Zhu Xide,Shi Shunji,Xu Ming,2009.Analysis of Summer Precipitation Anomaly and Atmospheric Circulation in “Sanjiangyuan” Region[J].Meteor Mon,35(7):39-45.