This study reveals that the strength of the springtime India–Burma trough (IBT) exhibits a notable interdecadal change around the early 2000s. Before the early 2000s, the IBT is closely related with an atmospheric wave train along the southern branch flow. In contrast, after the early 2000s, the IBT has a close relationship with sea surface temperature anomalies in the tropical central-eastern Pacific. These indicate that the IBT is primarily controlled by internal dynamic processes of the atmosphere before the early 2000s, and then by SST ano...
