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Pollen record of the centennial climate changes during 9–7 cal ka BP in the Changjiang (Yangtze) River Delta plain, China

Published online by Cambridge University Press:  28 February 2017

Bing Song ,
Zhen Li ,
Houyuan Lu ,
Limi Mao ,
Yoshiki Saito ,
Sangheon Yi ,
Jaesoo Lim ,
Zhen Li ,
Anqing Lu  and
Longbing Sha
...Show all authors
Bing Song*
Affiliation:
Quaternary Geology Department, Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Zhen Li*
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
Houyuan Lu
Affiliation:
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Limi Mao
Affiliation:
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
Yoshiki Saito
Affiliation:
Geological Survey of Japan, AIST, Central 7, Higashi 1–1–1, Tsukuba 305–8567, Japan
Sangheon Yi
Affiliation:
Quaternary Geology Department, Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea
Jaesoo Lim
Affiliation:
Quaternary Geology Department, Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea
Zhen Li*
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China Graduate School of Environmental Studies, Nagoya University, Fur-cho, Chikusa, Nagoya 464–8601, Japan
Anqing Lu
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Longbing Sha
Affiliation:
Key Laboratory of Geographic Information Science, East China Normal University, Shanghai 200062, China
Rui Zhou
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Xinxin Zuo
Affiliation:
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Vera Pospelova
Affiliation:
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
*
*Corresponding author at: Quaternary Geology Department, Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea. E-mail address: imbingsong@gmail.com (B. Song).
*Corresponding author at: State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China. E-mail address: imlizhen@hotmail.com (Z. Li).
*Corresponding author at: State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China. E-mail address: imlizhen@hotmail.com (Z. Li).
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Abstract

We reconstructed the centennial climate changes for the period of 9–7 cal ka BP in the upper region of the Changjiang (Yangtze) River Delta plain. A general warming and wetting trend from 8560 to 7220 cal yr BP was indicated by the decrease in Quercus (deciduous) and increases in Quercus (evergreen), Pinus, and Polypodiaceae spores. However, there were several brief climate fluctuations. A notable palynological change, from regional assemblages dominated by arboreal pollen to local assemblages mainly consisting of nonarboreal pollen, reflects climate fluctuations. The key indices of Quercus (deciduous), Pinus, herbs, fern spores, and palynological concentrations showed similar signs of centennial climate fluctuations. We suggest that the climate changes of the Dongge Cave and Yangtze River Delta regions were mainly affected by the East Asian summer monsoon (EASM) during the period of 9–7 cal ka BP. The general warming trend may be associated with an intensified EASM, and solar activity may be one of the important factors driving the centennial climate changes. The ~8.2 ka event was also recorded in the Yangtze River Delta region, which suggests that there was a close relationship between the EASM and Greenland climate during the early Holocene.

Keywords

Changjiang (Yangtze) River DeltaClimate change9–7 cal ka BPPalynologyEast Asian summer monsoon~8.2 ka eventSolar activity
Type
Research Article
Information
Quaternary Research , Volume 87 , Issue 2 , March 2017 , pp. 275 - 287
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2017 

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