500hPa环流变化与山东春季降水异常

500 hPa CIRULATION VARIATION AND PRECIPITATION ABNORMITY DURING SHANDONG SPRING

应用SVD技术 ,诊断分析了北半球 5 0 0hPa高度场与山东春季降水的关系。结果表明 :山东春季降水与北半球 5 0 0hPa高度场关系密切 ,山东春季降水与东亚上空 5 0 0hPa高度场具有很好的同步联系。前期 (冬季 )日本东北部 5 0 0hPa高度场是影响山东南部春季降水的关键区 ,具有预测意义。 5 0 0hPa高度距平场东高西低型是造成山东春季降水的主要大气环流形势 ,西高东低型是造成山东少雨的主要大气环流形势。

Using the singular value decomposition(SVD) method, we study the relationship between 500hPa height and spring precipitation in Shandong Province. The results show that the spring precipitation in Shandong Province has a good relationship with the 500hPa height in the north hemisphere. And the spring precipitation in Shandong Province also has a good synchronous relationship with the 500hPa height in East Asia. The 500hPa height of prior period (winter) in northeast of Japan is the ”key region” to forecast the spring precipitation in the south of Shandong Province. The atmospheric circulation pattern of higher in the east and lower in the west causes much spring precipitation in Shandong province, and on the other hand the pattern of higher in the west and lower in the east causes little spring precipitation.