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Evidence for solar cycles in a late Holocene speleothem record from Dongge Cave, China

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posted on 2023-06-08, 19:34 authored by Fucai Duan, Yongjin Wang, Chuan-Chou Shen, Yi WangYi Wang, Hai Cheng, Chung-Che Wu, Hsun-Ming Hu, Xinggong Kong, Dianbing Liu, Kan Zhao
The association between solar activity and Asian monsoon (AM) remains unclear. Here we evaluate the possible connection between them based on a precisely-dated, high-resolution speleothem oxygen isotope record from Dongge Cave, southwest China during the past 4.2 thousand years (ka). Without being adjusted chronologically to the solar signal, our record shows a distinct peak-to-peak correlation with cosmogenic nuclide 14C, total solar irradiance (TSI) and sunspot number (SN) at multi-decadal to centennial timescales. Further cross-wavelet analyses between our calcite d18O and atmospheric 14C show statistically strong coherence at three typical periodicities of ~80, 200 and 340 years, suggesting important roles of solar activities in modulating AM changes at those timescales. Our result has further indicated a better correlation between our calcite d18O record and atmospheric 14C than between our record and TSI. This better correlation may imply that the Sun–monsoon connection is dominated most likely by cosmic rays and oceanic circulation (both associated to atmospheric 14C), instead of the direct solar heating (TSI).

History

Publication status

  • Published

File Version

  • Published version

Journal

Scientific Reports

ISSN

2045-2322

Publisher

Nature

Issue

1

Volume

4

Page range

1-7

Article number

a5159

Department affiliated with

  • Geography Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2015-01-15

First Open Access (FOA) Date

2015-01-15

First Compliant Deposit (FCD) Date

2015-01-15

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