Potential influence of temperature changes in the Southern Hemisphere on the evolution of the Asian summer monsoon during the last glacial period

Li Yin Han, Ting Yong Li, Hai Cheng, R. Lawrence Edwards, Chuan Chou Shen, Hong Chun Li, Chun Xia Huang, Jun Yun Li, Na Yuan, Hai Bo Wang, Tao Tao Zhang, Xin Zhao

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A precisely 230Th-dated δ18O record of a stalagmite from Yangkou Cave, Chongqing, southwest China, is proposed to reconstruct the evolution of the East Asian summer monsoon (EASM) during the last glacial period (LGP) from 37.8 to 48.7 ka BP. The δ18O record reveals Dansgaard/Oeschger (D/O) 8-12 and Heinrich (H4, H5) climatic events. The inferred D/O events at EASM territory do not exhibit the asymmetrical feature of "rapid warming, slow cooling" recorded in Greenland ice cores. The Yangkou record is consistent with other records of Hulu and Xiaobailong Caves in the Chinese monsoon realm. Changes in the period from D/O 12 to D/O 9 and H4 events in the stalagmites is similar to the temperature changes recorded in the European Project for Ice Coring in Antarctica (EPICA) Dronning Maud Land Ice core (EDML). This similarity implies that Southern Hemisphere thermal condition could affect the EASM, the location of the Intertropical Convergence Zone (ITCZ), and also the Hadley circulation. Changes in D/O 12 and the end of the H5 in Chinese records are different from those in Socotra Island, located in the Indian summer monsoon (ISM) region, which are concurrent with NGRIP records. During the H5 period, in the Southern Hemisphere, temperature increased gradually to a maximum and the Hadley circulation intensity in the Southern Hemisphere decreased. Simultaneously, the southeast trade winds in the Southern Hemisphere gradually weakened, resulting in the weakening of the ISM and eventually the weakest ISM at ~47.2 ka BP. Our records support that the evolution of the summer monsoon in the low-latitude Asian zones was not only affected by summer insolation and climatic changes in the high latitudes of the Northern Hemisphere but also by temperature changes in the Southern Hemisphere.

Original languageEnglish (US)
Pages (from-to)239-250
Number of pages12
JournalQuaternary International
Volume392
DOIs
StatePublished - Jan 21 2016

Bibliographical note

Funding Information:
This research was financially supported by the NSFC (Nos. 41172165 , 41302138 , and 41440020 ), “the Fundamental Research Funds for the Central Universities” (Nos. XDJK2013A012 and XDJK2014C010 ), “ Karst Dynamics Laboratory, MLR and GZAR ” (No. KDL201301 ) and the open project of “ State Key Laboratory of Loess and Quaternary Geology ” (No. SKLLQG1310 ) to T.-Y., Li, and J.-Y., Li. This study was also supported by a Taiwan MOST grant ( 103-2119-M-002-022 to C.-C.S.).

Keywords

  • Dansgaard/Oeschger events
  • Heinrich events
  • Stalagmite
  • Th dating
  • Yangkou Cave
  • δO

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