摘要
使用 NCEP/ NCAR再分析资料 ,分析了冬季欧亚地区 5 0 0 h Pa高度距平场与下表面温度距平场间的大尺度相关空间型。结果表明 ,两个场整体相关程度远高于随机水平 ,得到 4对显著的耦合空间型 ,解释两场间协方差平方和的 86 %和各自方差的 5 8%和 38% ,反映 5 0 0 h Pa环流两种不同纬带的纬向环流异常和两种不同形态的经向环流异常 ,两个场距平之间的配合是受静力平衡关系支配的。秋季的表面温度异常能给出冬季中低纬 5 0 0 h Pa高度距平符号的信息。
Using NCEP/NCAR 40\|year reanalysis, we analyzed the large scale patterns of correlation between the deviations of geopotential height field at 500hPa and the anomalous skin temperature in Eurasia domain during boreal winter.It is found that the geopotential height field correlates much more significantly with skin temperature field than with a field that was artificially built up in a random way.The 4 pairs of coupled spatial pattern obtained with SVD (Singular Value Decomposition) method explain 86% of the total squared covariance between the two variables.These patterns also account for 58% of the total variance of geopotential height field and 38% of the total variance of the temperature field respectively.Two pairs out of 4 show us two zonal circulation anomaly patterns characterized respectively by different latitudinal location of the main disturbances.The other 2 pairs show us two different meridional circulation patterns.The 2 variable fields of the 4 coupled modes seem to be consistent with each other considering the hydrostatic equation.Additionally,the anomalous skin temperature field in fall can be used,to some extent,to predict the sign of the deviation of geopotential height over middle and low latitudes in the coming winter.
出处
《南京气象学院学报》
CSCD
北大核心
2001年第2期214-220,共7页
Journal of Nanjing Institute of Meteorology
基金
国家重点基础研究发展规划项目 G1 9980 4 0 90 1 -3
关键词
500hPa位势高度
表面温度
相关型
空间结构
冬季
the geopotential height at 500hPa,skin temperature of the earth,correlation pattern
