Decadal change of the connection between summer western North Pacific Subtropical High and tropical SST in the early 1990s

Abstract

AbstractA decadal change has occurred on the relationship between the summertime western North Pacific subtropical High (WNPSH) and the tropical Sea Surface Temperature anomalies (SSTA) in the early 1990s. After this decadal change, the interannual variability of the WNPSH is more strongly regulated by the SSTA over the equatorial central Pacific and the maritime continent. The earlier decay of El Niño in strong WNPSH years and the earlier development of El Niño in weak WNPSH years both contributed to this change. Such decadal change is found in the pre‐industrial control simulation of a coupled model, suggesting it is probably an internal variability of the climate system.