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

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)...

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Bibliographic Details
Published in:Quaternary Research
Main Authors: Song, Bing, Li, Zhen, Lu, Houyuan, Mao, Limi, Saito, Yoshiki, Yi, Sangheon, Lim, Jaesoo, Lu, Anqing, Sha, Longbing, Zhou, Rui, Zuo, Xinxin, Pospelova, Vera
Format: Report
Language:English
Published: CAMBRIDGE UNIV PRESS 2017
Subjects:
Changjiang (Yangtze) River Delta
Climate change
9-7 cal ka BP
Palynology
East Asian summer monsoon
similar to 8.2 ka event
Solar activity
SEA-LEVEL CHANGE
SURFACE SEDIMENTS
ASIAN MONSOON
PALYNOLOGICAL RECORD
VEGETATION RESPONSE
EASTERN CHINA
HUMAN IMPACT
HOLOCENE
MARINE
DEPOSITION
Physical Geography
Geology
Geography
Physical
Geosciences
Multidisciplinary
Greenland
Online Access:http://ir.nigpas.ac.cn/handle/332004/20456
https://doi.org/10.1017/qua.2017.1
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Summary: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.

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