Evidence for solar cycles in a late Holocene speleothem record from dongge cave, China

Fucai Duan, Yongjin Wang, Chuan Chou Shen, Yi Wang, Hai Cheng, Chung Che Wu, Hsun Ming Hu, Xinggong Kong, Dianbing Liu, Kan Zhao

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31 Scopus citations

Abstract

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 14 °C, total solar irradiance (TSI), and sunspot number (SN) at multi-decadal to centennial timescales. Further cross-wavelet analyses between our calcite 18O and atmospheric 14 °C 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 Î́ 18 O record and atmospheric 14 C 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 14°C), instead of the direct solar heating (TSI).

Original languageEnglish (US)
Article number5159
JournalScientific reports
Volume4
DOIs
StatePublished - Jun 4 2014

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