For a warm SSTA in the tropical Pacific, the surface easterly anomaly in the east of the basin extends into the tropical Atlantic, inducing a cold SSTA there, and vice versa.

The authors research the mechanism of indirected display on surface caused by buried geological anomaly at first, on the basis of physical simulated tests.

So, instead of'intermediate layer correction', we should adopt free air gravity anomaly and'topographic trend surface correction', which result in topographic trend surface free air gravity anomaly.