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

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 δ(18)O 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 res

SUBMITTER: Duan F 

PROVIDER: S-EPMC4044623 | biostudies-literature | 2014 Jun

REPOSITORIES: biostudies-literature