EAST ASIAN SUMMER MONSOON RECORD OVER 571~476 kaBP FROM A STALAGMITE IN SHENNONGJIA

Three ²³⁰Th dating results and 236 oxygen isotope data of a 1.2-m-long stalagmite were collected from Shanbao Cave in Shennongjia of Hubei Province. Within the dating uncertainty, an astronomical tuning was applied to reconstruct an East Asian summer monsoon history from 571 to 476 kaBP. Our record spans four precessional cycles, with an average amplitude of 4, which suggests East Asian monsoon variability was still paced by insolation in this period. A similar pattern to the last deglacial was found during the transition of MIS 14/13. A series of millennial climate events were superposed on the precessional trend of East Asian summer monsoon, indicating an inherent frequency self-sustained in the global climate system, which may be an interaction of ocean, land and atmosphere.