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

• DOI: 10.1038/srep05159
• Publication Date: 2014-06-04T09:05:15Z
• Authors: Fucai Duan; Yongjin Wang; Chuan-Chou Shen; Yi Wang; Hai Cheng; Chung-Che Wu; Hsun-Ming Hu; Xinggong Kong; Dianbing Liu; Kan Zhao
• Keywords: Speleothem; Stalagmite; Cosmogenic nuclide; Sunspot; East Asian Monsoon

The association between solar activity and Asian monsoon (AM) remains unclear. Here we evaluate the possible connection them based on a precisely-dated, high-resolution speleothem oxygen isotope record from Dongge Cave, southwest China during past 4.2 thousand years (ka). Without being adjusted chronologically to signal, our shows distinct peak-to-peak correlation with cosmogenic nuclide (14)C, total irradiance (TSI), sunspot number (SN) at multi-decadal centennial timescales. Further cross-wavelet analyses calcite δ(18)O atmospheric (14)C show statistically strong coherence three typical periodicities of ~80, 200 340 years, suggesting important roles activities in modulating AM changes those Our result has further indicated better than TSI. This may imply that Sun-monsoon is dominated most likely by cosmic rays oceanic circulation (both associated (14)C), instead direct heating (TSI).