The subduct ion sign propagates toward the western tropical pacif ic ; and the decadal sign from the western tropical pacific propagates toward north - east . they meet at about 160 meter in depth in subtropical pacific 从北太平洋窗口区潜沉的海温年代际信号沿西南路径传播到副热带地区,在温跃层160m上下与热带西太平洋向东北传播的海温异常信号会合。