中国东部夏季降水与气温的联合EOF分析

Joint EOF Analysis of Summer Precipitation and Temperature in Eastern China

采用JEOF等方法分析中国东部夏季降水和气温的协同变化时空分布特征,结果表明:当时间系数为正时,第1典型场降水型态从北向南(下同)呈"++-"分布,气温表现为冷异常,500 hPa回归场在中纬度地区呈显著低压异常,SST回归场表现为太平洋海域呈西北-东南的分布;第2典型场降水呈"+-"分布,气温则呈"-+"分布;第3典型场降水分布呈中间型,气温场呈"-+"分布。

Using the method of JEOF, this work studies the characteristics of spatiotemporal distribution of concurrent variation of summer precipitation and temperature in eastern China. The result is shown as follows. When the time coefficient is positive, the pattern of precipitation for the first typical field shows a "++-" distribution from north to south(same below) and the temperature is of cold anomaly. A regression field at 500 hPa shows a significant low-pressure anomaly in the mid-latitude area and an SST regression field shows a northwest-southeast distribution over the area of the Pacific. The precipitation for the second typical field shows a "+-" distribution and the temperature a "-+" distribution. The precipitation for the third typical field shows a distribution in between and the temperature a "-+" distribution.