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Summer Monsoon Rainfall Variability in Central China over the Past 4700 Years and Its Possible Link to Solar Activity

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Abstract

Based on 467 pairs of δ18O and δ13C records and 8 230Th dates from a stalagmite (BF4) from Xiniu Cave, central China, we present a reconstruction of ∼9-yr resolution monsoon rainfall record for the past 4700 years. Our δ18O record shows good coherence with East Asian summer monsoon (EASM) rainfall proxies from adjacent regions during the overlapping intervals, suggesting that δ18O signal in BF4 can be interpreted as a monsoon rainfall proxy. The δ13C variations are related to changes in local processes at the cave site, and regional rainfall and temperature changes. Based on the δ18O record, a series of dry periods can be identified at 4500–1200, 3500–3200, 2800–2500, 1900–1600, 1400–1200, 700–500, and 400–200 yr BP, while a series of wet periods can be identified at 4200–3600, 2400–2200, 3200–2800, 1100–900, 600–400, and 200–100 yr BP. Power spectrum analysis on our δ18O record reveals significant cycles at ∼470 and ∼80 yr, coinciding with the typical solar periodic variations. This result suggests that changes in solar activity play a dominant role in driving centennial-decadal monsoon rainfall variation in central China. Due to minor changes in solar irradiance (less than 1.5 W m−2) over the past 4700 years, our record was further compared to the El Niño-Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) proxies, confirming that solar forcing on monsoon rainfall changes might be amplified by the ENSO and PDO variations. From 600 to 150 yr BP (the Little Ice Age, LIA), a positive shift of ∼2‰ can be revealed in both the δ18O and δ13C records, indicating a cold/dry climatic pattern. By comparing our δ18O and δ13C records with historical documents, we suggest that the climatic deteriorations between 450 and 250 yr BP may have caused serious social unrest at the end of the Ming Dynasty.

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Acknowledgments

We wish to thank the constructive suggestions from editors and three anonymous reviewers. In addition, Jingwei Zhang especially wish to thank Leina Wei, whose concerns have given his spiritual support over the past years.

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Correspondence to Kan Zhao.

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Supported by the National Natural Science Foundation of China (42071105, 41571102, 41931178, 41672164, and 41172314), U.S. Nature Science Foundation (1702816), Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (164320H116), and 111 Program of China (D19002).

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Zhang, J., Zhao, K., Kong, X. et al. Summer Monsoon Rainfall Variability in Central China over the Past 4700 Years and Its Possible Link to Solar Activity. J Meteorol Res 35, 594–606 (2021). https://doi.org/10.1007/s13351-021-0168-1

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  • DOI: https://doi.org/10.1007/s13351-021-0168-1

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