TY - JOUR
T1 - Cyclic changes of Asian monsoon intensity during the early mid-Holocene from annually-laminated stalagmites, central China
AU - Liu, Dianbing
AU - Wang, Yongjin
AU - Cheng, Hai
AU - Edwards, R. L.
AU - Kong, Xinggong
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - Climate during the early Holocene was highly variable due to the complex interplay of external and internal forcing mechanisms. The relative importance for them on the Asian monsoon (AM) evolution yet remains to be resolved. Here we present two-to six-yr-resolution oxygen isotope (δ18O) records of five stalagmites, four of which are annually-laminated, from Qingtian Cave, central China, revealing detailed AM variability between 10.9 and 6.1kaBP. Over the contemporaneous periods, the δ18O records agree well with each other at multi-decadal to centennial timescales. When pieced together with the previously published isotopic data from the same cave, the final δ18O record reveals detailed AM variability from the last deglaciation to the mid-Holocene, consistent with other cave records. The most striking feature of the δ18O record is the recurrence of centennial-scale oscillations, especially during the annually-counted period (8.8-6.1kaBP). Cross-wavelet analyses between the δ18O record and solar proxies show strong coherence at 200-yr cycle, suggesting that solar output was actively involved as a primary contributor. The AM depression at 8.2kaBP is indistinguishable in amplitude and pattern from a series of weak AM events after 8kaBP. We speculate that these centennial-scale AM changes might be regulated by the positive feedbacks of oceanic/atmospheric interactions to the solar activity under the condition of the retreat of continental ice-sheets.
AB - Climate during the early Holocene was highly variable due to the complex interplay of external and internal forcing mechanisms. The relative importance for them on the Asian monsoon (AM) evolution yet remains to be resolved. Here we present two-to six-yr-resolution oxygen isotope (δ18O) records of five stalagmites, four of which are annually-laminated, from Qingtian Cave, central China, revealing detailed AM variability between 10.9 and 6.1kaBP. Over the contemporaneous periods, the δ18O records agree well with each other at multi-decadal to centennial timescales. When pieced together with the previously published isotopic data from the same cave, the final δ18O record reveals detailed AM variability from the last deglaciation to the mid-Holocene, consistent with other cave records. The most striking feature of the δ18O record is the recurrence of centennial-scale oscillations, especially during the annually-counted period (8.8-6.1kaBP). Cross-wavelet analyses between the δ18O record and solar proxies show strong coherence at 200-yr cycle, suggesting that solar output was actively involved as a primary contributor. The AM depression at 8.2kaBP is indistinguishable in amplitude and pattern from a series of weak AM events after 8kaBP. We speculate that these centennial-scale AM changes might be regulated by the positive feedbacks of oceanic/atmospheric interactions to the solar activity under the condition of the retreat of continental ice-sheets.
KW - Annually-laminated stalagmites
KW - Cyclic Asian monsoon changes
KW - Early mid-Holocene
KW - Qingtian Cave
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U2 - 10.1016/j.quascirev.2015.05.003
DO - 10.1016/j.quascirev.2015.05.003
M3 - Article
AN - SCOPUS:84930208586
SN - 0277-3791
VL - 121
SP - 1
EP - 10
JO - Quaternary Science Reviews
JF - Quaternary Science Reviews
ER -