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Evidence for solar cycles in a late Holocene speleothem record from Dongge Cave, China
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Evidence for solar cycles in a late Holocene speleothem record from Dongge Cave, China
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Journal Article
Evidence for solar cycles in a late Holocene speleothem record from Dongge Cave, China
2014
Overview
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 result has further indicated a better correlation between our calcite δ
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).
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
