The horizontal circulation systems between the monsoon and the trade are the tropical upper tropos-pheric trough(TUTT)in the upper and the Pacific subtropical high in the lower.

• 连接季风环流与信风环流的水平环流系统,在高层为太平洋中部热带对流层高层槽(TUTT),低层为强大的太平洋副热带高压。太平洋中部高空槽区就是季风环流与信风环流的连接区或过渡区。