Timing and structure of Termination II in north China constrained by a precisely dated stalagmite record

• Published in: Earth and planetary science letters 2019-04, Vol.512, p.1-7
• Main Authors: Duan, Wuhui, Cheng, Hai, Tan, Ming, Li, Xianglei, Lawrence Edwards, R.
• Format: Article
• Language: English
• Subjects: north China; speleothem record; Termination II; timing and structure
• ISSN: 0012-821X; 1385-013X
• DOI: 10.1016/j.epsl.2019.01.043

The timing and structure of Termination II (T-II) is still debatable as the number of high-quality records is insufficient. This study presents precisely dated stalagmite δ18O data between 133.4±0.3 to 126.6±0.3 ka BP (covering most of T-II) from north China, near the northern limit of the East Asian summer monsoon (EASM), an area sensitive to climate change. The onset of the last interglacial is constrained at 129.4±0.3 ka BP, consistent with south Chinese speleothem records, further supporting the idea that Northern Hemisphere summer insolation plays an important role in initiating glacial terminations. An extended interval of heavy δ18O is observed immediately prior to this abrupt transition, named as the “Weak Monsoon Interval” (WMI) in south Chinese cave records, which was associated with the Heinrich Stadial 11 (H11) in the North Atlantic. A significant millennial-scale interstadial peaking at 132.7±0.3 ka BP is identified preceding the weakest phase of the WMI. A synchronous counterpart is also found in some south Chinese speleothem and North Atlantic alkenone Mg/Ca SST records. It is inferred that the main H11 freshwater penetration possibly occurred after 131.5 ka BP, leaving some aspects of ocean and atmospheric circulation still in interstadial mode from 134 to 131.5 ka BP. Following the onset of the last interglacial, there was a millennial-scale “pause” in our δ18O record, synchronized with a “slowdown” in the rate of decrease in δ18O in south Chinese cave records. This is possibly a large regional climate oscillation, as it is also identified in some North Atlantic records, but one which is too weak to be a Younger Dryas (YD)-type event. In summary, compared to south Chinese cave records, significant millennial-scale climate oscillations before and after the synchronous onset of the last interglacial is the main feature of our record. Nevertheless, the sequence of these climate events remains very different from Termination I (T-I), which is possibly ascribed to the stronger insolation, higher atmosphere CO2, and the resultant faster and greater meltwater pulse to the North Atlantic during T-II than during T-I. •Termination II (T-II) in north China recorded by a precisely dated stalagmite.•The last interglacial onset was at around 129 ka BP in both north and south China.•Millennial-scale event of T-II in north China is more significant than south China.•Evolution of T-II is different from Termination-I shown by Chinese cave records.