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

doi:10.1038/srep05159

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

Earth and Environmental Sciences-Twin Cities

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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 language	English (US)
Article number	5159
Journal	Scientific reports
Volume	4
DOIs	https://doi.org/10.1038/srep05159
State	Published - Jun 4 2014

Bibliographical note

Funding Information:
This work was jointly supported by National Natural Science Foundation of China grants (Nos. 41130210, 41172314 and 41230524) and National Basic Research Program of China (No. 2013CB955902). U-Th dating at the HISPEC was supported by the Taiwan ROC MOST and NTU grants (Nos. 101-2116-M-002-009, 102-2116-M-002-016, and 101R7625).

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title = "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 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 {\^I}́ 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).",

author = "Fucai Duan and Yongjin Wang and Shen, {Chuan Chou} and Yi Wang and Hai Cheng and Wu, {Chung Che} and Hu, {Hsun Ming} and Xinggong Kong and Dianbing Liu and Kan Zhao",

note = "Funding Information: This work was jointly supported by National Natural Science Foundation of China grants (Nos. 41130210, 41172314 and 41230524) and National Basic Research Program of China (No. 2013CB955902). U-Th dating at the HISPEC was supported by the Taiwan ROC MOST and NTU grants (Nos. 101-2116-M-002-009, 102-2116-M-002-016, and 101R7625).",

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AU - Duan, Fucai

AU - Wang, Yongjin

AU - Shen, Chuan Chou

AU - Wang, Yi

AU - Cheng, Hai

AU - Wu, Chung Che

AU - Hu, Hsun Ming

AU - Kong, Xinggong

AU - Liu, Dianbing

AU - Zhao, Kan

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PY - 2014/6/4

Y1 - 2014/6/4

N2 - 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).

AB - 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).

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

Abstract

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