Late Holocene monsoon precipitation changes in southern China and their linkage to Northern Hemisphere temperature

Kan Zhao, Yongjin Wang, R. Lawrence Edwards, Hai Cheng, Xinggong Kong, Dianbing Liu, Qingfeng Shao, Yingfang Cui, Changchun Huang, Youfeng Ning, Xunlin Yang

Research output: Contribution to journalArticlepeer-review

Abstract

Observations and models suggest a latitudinal redistribution of precipitation as a result of ongoing global climatic warming. However, the dynamic link between temperature and regional precipitation in the course of natural climatic variability during the current interglacial period remains unclear, especially in the monsoon regions of China. Here we present a reconstruction of a ∼5 year-resolution summer monsoon rainfall record for the past 3200 years, based on 622 pairs of δ18O and δ13C and 29 230Th dates from a stalagmite (Wu37) from Wulu Cave in southern China. A close similarity between the δ18O and δ13C records on centennial to decadal timescales suggests that calcite δ18O is most likely a proxy associated with monsoon precipitation. The record reveals that the Little Ice Age (650 - 100 yr B.P.) was a relatively humid period, with two centennial-scale wet events, compared with the Medieval Warm Period (1050 - 650 yr B.P.). In contrast with previous observations in India and northern China, monsoon precipitation variations indicated by our record and other cave records nearby were inversely related to changes in Northern Hemisphere (NH) temperature over the past two millennia, in particular to variations in the thermal gradient between the Northern and Southern hemispheres. This suggests that NH temperature has an important influence on summer precipitation in southern China, via the interhemispheric thermal gradient and land-ocean thermal contrast. In addition, we find that variations of monsoon rainfall in southern China on multi-centennial to centennial timescales are inversely correlated with observed rainfall in the core monsoon region of India and in the northern fringe of the Asian summer monsoon region in China. This spatial pattern of rainfall variability can be interpreted as a result of the migration of the intertropical convergence zone that is likely dominated by the interhemispheric thermal gradient via cross-equatorial airflows.

Original languageEnglish (US)
Article number106191
JournalQuaternary Science Reviews
Volume232
DOIs
StatePublished - Mar 15 2020

Bibliographical note

Funding Information:
This work was supported by the National Key R&D Program of China (award 2016YFA0600401 ), National Natural Science Foundation of China (awards 41571102 , 41572151 , 41702180 ), the U.S. Nature Science Foundation (award 1103403 ) and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (award 164320H116 ). We thank the editors and two anonymous reviewers for constructive comments.

Funding Information:
This work was supported by the National Key R&D Program of China (award 2016YFA0600401), National Natural Science Foundation of China (awards 41571102, 41572151, 41702180), the U.S. Nature Science Foundation (award 1103403) and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (award 164320H116). We thank the editors and two anonymous reviewers for constructive comments.

Publisher Copyright:
© 2020 Elsevier Ltd

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • Monsoon precipitation
  • Southern China
  • Spatial pattern
  • Speleothem
  • Temperature

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