DO Events During 76～58 kaB.P. from a Stalagmite in Tian’e Cave, Shennongjia Area

Key words: 
• DO event /
• oxygen isotope /
• stalagmite /
• Shennongjia

Abstract: An oxygenisotope record of a thoriumuraniumdated stalagmite from Tian’e Cave at Shennongjia reflects variation of the East Asian monsoon during the period from 76 to 58 kaB. P. The highresolution (40yr)δ18O record displays a centennialscale variability of the monsoonal precipitation during MIS4. Comparison between stalagmite SW12, Tian’e Cave, stalagmite MSL, Hulu Cave and NGRIP ice core shows that moisture intensity of Tian'e Cave DO18 event reaches that during MIS3, with an amplitude similar to the counterpart in polar record. The initiation timing of DO18 event, Tian'e Cave is consistent with that in Hulu Cave within the dating error, and further confirmed the age of polar DO18 event. Such a strong peak reveals a period of strengthened summer monsoon under a decrease in global temperature during MIS4. Before 70 kaB.P., DO19 event in ice core is older than the counterpart in Asian monsoon at least by 950 years, which is far beyond 230Th dating error of about 700 years. During 69.3～64.4 kaB.P. (DO19′18), centennial oscillations in ice core are an analogy to those of stalagmite SW12, suggesting an interaction of tropical sea and North Atlantic thermohaline.