The 7.2 ka climate event: Evidence from high-resolution stable isotopes and trace element records of stalagmite in Shuiming Cave, Chongqing, China

Xiangxiang Feng, Yan Yang, Hai Cheng, Jingyao Zhao, Xinggong Kong, Ping Zhang, Zhili He, Xiao Shi, R. Lawrence Edwards

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Speleothem records have radically changed our understanding of the paleo Asian monsoon (AM), but explanations for Asian summer monsoon (ASM) variations in the Holocene period are usually based on single proxy records, such as oxygen isotope (δ18O). The application of multi-proxy records to the study of the forcing mechanism and internal structure of climate events is more comprehensive and accurate in the analysis of paleoclimates than using single proxy records. Therefore, a multi-proxy speleothem record of weak ASM events in 8.0–7.0 BP from Chongqing, which showed a dry southwestern China during weak ASM episodes, was reported. The analysis of multi-proxy records of SMY2 stalagmite indicated that the beginning of the ‘7.2 ka event’ was at 7.29 ± 0.03 ka BP, and its culmination was at 7.1 ± 0.04 ka BP. Thus, this event lasted nearly 200 a, and the main drought period lasted 50 a. Power spectrum analysis showed a significant 61 a cycle signal during the study period in the δ18O record of SMY2, which coincided with the Atlantic multidecadal oscillation activity (AMOC) cycle. This study demonstrates that the ASM during 8.0–7.0 ka BP is strongly correlated with the changes in solar activity and also sensitive to the southward shift of Intertropical Convergence Zone (ITCZ) and AMOC cycle.

Original languageEnglish (US)
Pages (from-to)145-154
Number of pages10
JournalHolocene
Volume30
Issue number1
DOIs
StatePublished - Jan 1 2020

Bibliographical note

Funding Information:
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the National Key R&D Program of China (No. 2016YFC050230205) and grants of the National Natural Science Foundation of China (Nos 41877450, 41672160, 41372177, and 40902053).

Keywords

  • 7.2 ka event
  • Chongqing
  • Holocene
  • Shuiming Cave
  • drought
  • stalagmite
  • trace elements

Fingerprint Dive into the research topics of 'The 7.2 ka climate event: Evidence from high-resolution stable isotopes and trace element records of stalagmite in Shuiming Cave, Chongqing, China'. Together they form a unique fingerprint.

Cite this