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Seasonal Timing of ENSO Decay Phase Matters for Summer Indian Ocean SST and Asian Monsoon Onset
孙舒悦
国家气候中心
ENSO affects the tropical Indian Ocean Basin (IOB) SST in winter-spring of ENSO decay years through the ENSO-induced ‘atmospheric-bridge’ and subsequent air-sea coupling processes. This study reports that, at both the interannual and interdecadal timescales, the summer IOB SST anomalies can largely be attributed to those later-decay ENSO events. Specifically, the ENSO-related significant IOB SST anomalies can/cannot persist into summer following later-decay/early-decay ENSO events; The observed interdecadal summer IOB warming in recent decades can be attributed to the presence of five later-decay El Ni?o events after 1970s. Moreover, it is those later-decay ENSO events in the history that are mainly responsible for the known ENSO-monsoon relationship especially for the BOB (Bay of Bengal) and Indian monsoon onset, which is found no longer significant without those later-decay ENSO events.