新疆南疆4月气温异常的同期环流特征分析

Analysis on Contemporaneous Circulation Features of Temperature Abnormality in April in South Xinjiang

利用1961-2005年新疆南疆14站气温资料和NCEP/NCAR再分析月平均高度、温度和风场资料,分析了南疆4月气温极端偏低（高）年同期500 hPa月平均环流和高度、温度、风场的距平分布特征。结果表明,4月500 hPa高压脊的不同位置,经向环流异常、高度场和风场的距平空间分布,及高度和温度的距平垂直分布以65°E为界,东西差异显著。

Using temperature data of 1961 -2005 from 14 stations in south Xinjiang to reanalyze the mean height, temperature and wind field data with NCEP/NCAR, the anomaly distribution characteristics of monthly mean circulation abnormality, height, temperature in contemporaneous month with 500 hPa in the year with extremely low （high） temperature in April in south Xinjiang were analyzed. The results showed that at different position of 500 hPa pressure ridge in April, the meridional circulation was abnormal, the spatial distribution of height field and wind field anomaly and the vertical distribution of height and temperature anomaly of east and west had significant difference with 65°E as boundary.