在东半球的赤道区内产生的冬夏季节方向相反的跨赤道气流、季风槽季节位移和经圈环流季节变化都是最明显的。
The cross equator flow in troposphere over equator region are nearly opposite in winter and summer in eastern hemisphere . The seasonal variation of monsoon trough and mean meridional circulations are also very marked .
季风槽