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In the warming world,tropical Pacifi c sea surface temperature(SST)variation has received considerable attention because of its enormous infl uence on global climate change,particularly the El Ni?o-Southern Oscillation process.Here,we provide new high-resolution proxy records of the magnesium/calcium ratio and the oxygen isotope in foraminifera from a core on the Ontong-Java Plateau to reconstruct the SST and hydrological variation in the center of the Western Pacifi c Warm Pool(WPWP)over the last360000 years.In comparison with other Mg/Ca-derived SST and δ~(18)O records,the results suggested that in a relatively stable condition,e.g.,the last glacial maximum(LGM)and other glacial periods,the tropical Pacifi c would adopt a La Ni?a-like state,and the Walker and Hadley cycles would be synchronously enhanced.Conversely,El Ni?o-like conditions could have occurred in the tropical Pacifi c during fastchanging periods,e.g.,the termination and rapidly cooling stages of interglacial periods.In the light of the sensitivity of the Eastern Pacifi c Cold Tongue(EPCT)and the inertia of the WPWP,we hypothesize an inter-restricted relationship between the WPWP and EPCT,which could control the zonal gradient variation of SST and aff ect climate change.
In the warming world, tropical Pacifi c sea surface temperature (SST) variation has received interesting attention because of its enormously infl uence on global climate change, particularly the El Niño-Southern Oscillation process. Here, we provide new high-resolution proxy records of the magnesium / calcium ratio and the oxygen isotope in foraminifera from a core on the Ontong-Java Plateau to reconstruct the SST and hydrological variation in the center of the Western Pacifi c Warm Pool (WPWP) over the last 360000 years.In comparison with other Mg / Ca-derived SST and δ ~ (18) O records, the results suggested that in a relatively stable condition, eg, the last glacial maximum (LGM) and other glacial periods, the tropical Pacifi c would adopt a La Ni? a-like state, and the Walker and Hadley cycles would be synchronously enhanced. Contraversely, El Niño-like conditions could have occurred in the tropical Pacifi c during fastchanging periods, eg, the termination and rapidly cooling stages of interglacial periods. I n the light of the sensitivity of the Eastern Pacifi c Cold Tongue (EPCT) and the inertia of the WPWP, we hypothesize an inter-restricted relationship between the WPWP and EPCT, which could control the zonal gradient variation of SST and aff ect climate change .