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利用ＥＣＭＷＦ高度场资料，详细分析了１９８５年（旱年）和１９９１年（涝年）５月主要季风环流系统的旬平均和旬距平特征。结果表明，５月各旬，旱涝年的主要季风系统的位置和强度有明显差异。并指出夏季降水的异常，不仅与５月各旬北半球的南亚高压、极涡、西太平洋副高等系统的活动异常有关，而且与南半球的澳大利亚冷高、马斯克林高压的强弱有关，甚至与南半球中高纬环流的经向度大小也有联系。
Using the ECMWF geopotential height field data, the characteristics of ten-day mean and ten-day anomalies of the major monsoon circulation systems in 1985 (dry year) and May 1991 (dry year) are analyzed in detail. The results showed that there were significant differences in the locations and intensities of the major monsoon systems during the drought and flood years at the end of May. And pointed out that the anomalies of summer precipitation are not only related to the anomalous activities of the South Asia High and the Polar Vortex and the Western Pacific subtropical high in the northern hemispheres in May but also related to the cold and high levels of the Australian Heights and the high Musclelin pressure in the southern hemisphere, The meridional dimension of the circulation in the mid-high latitudes of the southern hemisphere is also linked.