【摘要】 根据本文第一部分提出的概念、理论和方法，利用ＥＣＭＷＦ客观分析的几个特定等压面上的位势高度场和东西风场资料，计算和分析了个别年份（１９８１年）北半球大气环流的季节变化，尤其是对亚洲西太平洋地区季节突变进行了详细的研究。（１）首先给出了１９８１年大气环流各季的一些基本特征。减去年平均后，发现冬季和夏季环流型相反，而春、秋季环流型则与冬季环流型几乎正交。（２）计算了各候平均场偏差和典型的冬季偏差场Ｆ′ｗ的相似性系数Ｒｗ，分析它们的特征并加以比较，结果是半球尺度的大气环流过渡季节（春、秋）虽然短些，但突变性不很明显。（３）为了研究与行星尺度相联系的南北向季节推移，本文给出了纬圈平均偏差场的Ｒｗ（ｔ）分布，发现在大多数纬度中，对流层大气环流的季节变化都有突变性，纬度越低，春季来临越早，秋季来临越迟。（４）为了研究大气中行星波，东西向环流结构的季节变化及调整，本文给出了按经圈平均偏差场的Ｒｗ（ｔ）分布，发现在低空和对流层高层及平流层低层季风区内季节突变十分显著，鲜明地反映了季风环流和季节变化的关系。（５）最后，本文计算了北半球各个２０°×１０°经纬距分区域中的Ｒｗ（ｔ）分布，发现在许多分区域中，季节突变都很明显，尤其?更多还原

【Abstract】 Based on the theory and method developed in the first part of this paper, the ECMWF data for particular year, 1981, are analyzed in order to study the devison of seasons of the general atmospheric circulation and their abrupt changes Especially the following aspects are discussed in detail in the Asia-Western Pacific Ocean region (1) It is shown that the summer pattern of atmospheric circulation subtracted from the annual mean is opposite to the winter one, and those for the spring and autumn are almost orthogonal to the winter one (2) Both transitions are rather rapid from winter to summer and from summer to next winter in the hemispheric scale circulation, but these transitions are not abrupt (3) In order to investigate the meridional propagation and difference of the seasonal transitions, the R w (t) (the normalized correlation of the pattern for time t to the typical winter pattern) is calculated for every zonal band divided by latitudual cycle It is shown that the seasonal transitions in most bands are abrupt, and that the earlier spring season comes and the later autumn comes in the lower latitude (4) The R w (t) is calculated for every meridional band in the Northern Hemisphere, and it is shown that the abrupt seasonal changes occur in all altitudes of the troposphere and lower stratosphere from Asia to the western Pacific Ocean regions, which is characterized by the Asian monsoon (5) R w (t) is also calculated for every large scale region with 20°×10° in the latitude and longitude, which shows the very abrupt transition of seasons in the Asian monsoon region, and also shows the 4-dimensional structure of seasonal transitions更多还原