Abstract
The Indo-Pacific warm pool(IPWP)is crucial for regional and global climates.However,the development of the IPWP and its effect on the regional climate during the Cenozoic remain unclear.Here,using a com-pilation of sea surface temperature(SST)records(mainly since the middle Miocene)and multimodel paleoclimate simulations,our results indicated that the extent,intensity and warmest temperature posi-tion of the IPWP changed markedly during the Cenozoic.Specifically,its extent decreased,its intensity weakened,and its warmest temperature position shifted from the Indian to western Pacific Ocean over time.The atmospheric CO2 dominated its extent and intensity,while paleogeography,by restricting the distribution of the Indian Ocean and the width of the tropical seaways,controlled the shift in its warmest temperature position.In particular,the eastward shift to the western Pacific Ocean from the middle to late Miocene inferred from compiled SST records likely resulted from the constriction of trop-ical seaways.Furthermore,by changing the atmospheric thermal structure and atmospheric circulation,the reduced extent and intensity of the IPWP decreased the annual precipitation in the western Indian Ocean,eastern Asia and Australia,while the shift in the warmest temperature position from the Indian to western Pacific Ocean promoted aridification in Australia.Qualitative model-data agreements are obtained for both the IPWP SST and regional climate.From the perspective of past warm climates with high concentrations of atmospheric CO2,the expansion and strengthening of the IPWP will occur in a warmer future and favor excessive precipitation in eastern Asia and Australia.
基金项目
中国科学院战略规划重点项目(XDB42000000)
Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(2019QZKK0101)
国家自然科学基金(42071113)
国家自然科学基金(42371166)
NETL
NSTL
万方数据