平均经圈环流型的转变与长期天气过程

ON THE VARIATION OF MEAN MERIDIONAL CIRCULATION RELATED WITH LONG-RANGE WEATHER PROCESS

中文摘要:

      本文揭露,热带太平洋地区的平均经圈环流存在着两种最基本的类型:经典哈得来环流圈和哈得来反环流圈.它们的出现,不仅具有明显的季节特点,而且还存在着一类值得重视的非季节性的长期变化.平均经圈环流强度,具有周期大约48个月的长期振荡.这一振荡与赤道纬圈平面上垂直环流的变化有密切关系,并能对该地区大气的水平环流产生重要的影响.

英文摘要:

      It is revealed that the mean meridional circulation in the tropical Pacific ocean has two different basic patterns:Hadley cell and Anti-Hadley cell. The transformation of one type of the mean meridional circulation to the other not only has the seasonal variation but also the non-seasonal long-term variation. The intensity of meridional circulation has a long-term fluctuation with the period of 32-48 monthes. It is also found that the transformation of mean meridional circulation patterns is closely connected with the variation of the vertical circulation on the vertical plane along the equator. There exists a low-frequency coupling oscillation between them. The transformation of atmospheric vertical circulations would have some importent influences on the long-range weather variation in this region.