An exceptionally strengthened East Asian summer monsoon event between 19.9 and 17.1 ka BP recorded in a Hulu stalagmite

Jiang Ying Wu, Yong Jin Wang, Hai Cheng, L. R. Edwards

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A stalagmite-based isotope record (No. H82) from Nanjing Hulu Cave, spanning from 16.5 to 10.3 ka BP, provided strong evidence for a coherence relation between the East Asian summer monsoon (EASM) and the North Atlantic climates on millennial time scales. Here we extend the high-resolution δ18O time series back to 22.1 ka BP with additional 7 230Th dates and 573 stable isotope measurements on the lower part of that sample. The new record with a decadal resolution, piecing together with the previous data, provides a detailed, complete Last Glacial Maximum (LGM)/deglacial history of the EASM. Two centennial-scale weak monsoon events are detected within the analogue H1 event, and can be correlated to corresponding Greenland temperature shifts. This suggests a rapid re-organization of atmospheric and oceanic circulations during the ice-rafted debris (IRD) event in North Atlantic. A strengthened EASM event spanning from 19.9 to 17.1 ka BP, firstly reported here, reaches on average a half of the monsoon intensity of Bølling warming with its peak close to the full level. Taking all available evidence from continental and oceanic sediments into consideration, we suggest that a forcing mechanism behind the event would be a positive feedback of the tropical Pacific Super-ENSO cycles in response to precessional changes in solar irradiation.

Original languageEnglish (US)
Pages (from-to)360-368
Number of pages9
JournalScience in China, Series D: Earth Sciences
Volume52
Issue number3
DOIs
StatePublished - 2009

Bibliographical note

Funding Information:
Received March 3, 2008; accepted November 5, 2008 doi: 10.1007/s11430-009-0031-1 †Corresponding author (email: wujiangying@njnu.edu.cn) Supported by National Natural Science Foundation of China (Grand No. 40501003)

Keywords

  • East Asian summer monsoon event
  • Nanjing Hulu Cave
  • Stalagmite

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