The East Asian Monsoon During MIS 2 Expressed in a Speleothem δ 18 O Record From Jintanwan Cave, Hunan, China

Stalagmite J1 from Jintanwan Cave, Hunan, China, provides a precisely dated, decadally resolved δ 18 O proxy record of paleoclimatic changes associated with the East Asian monsoon from ∽29.5 to 14.7 ka and from ∽12.9 to 11.0 ka. At the time of the last glacial maximum (LGM), the East Asian summer mo...

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Bibliographic Details
Published in:Quaternary Research
Main Authors: Cosford, Jason, Qing, Hairuo, Lin, Yin, Eglington, Bruce, Mattey, Dave, Chen, Yue Gau, Zhang, Meiliang, Cheng, Hai
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2010
Subjects:
Greenland
Greenland ice cores
North Atlantic
Online Access:http://dx.doi.org/10.1016/j.yqres.2010.01.003
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Description
Summary:Stalagmite J1 from Jintanwan Cave, Hunan, China, provides a precisely dated, decadally resolved δ 18 O proxy record of paleoclimatic changes associated with the East Asian monsoon from ∽29.5 to 14.7 ka and from ∽12.9 to 11.0 ka. At the time of the last glacial maximum (LGM), the East Asian summer monsoon weakened and then strengthened in response to changes in Northern Hemisphere insolation. As the ice sheets retreated the East Asian summer monsoon weakened, especially during Heinrich event H1, when atmospheric and oceanic teleconnections transferred the climatic changes around the North Atlantic to the monsoonal regions of Eastern Asia. A depositional hiatus between ∽14.7 and 12.9 ka leaves the deglacial record incomplete, but an abrupt shift in δ 18 O values at ∽11.5 ka marks the end of the Younger Dryas and the transition into the Holocene. Comparisons of the J1 record to other Chinese speleothem records indicate synchronous climatic changes throughout monsoonal China. Further comparisons to a speleothem record from western Asia (Socotra Island) and to Greenland ice cores support hemispherical-scale paleoclimatic change. Spectral and wavelet analyses reveal centennial- and decadal-scale periodicities that correspond to solar frequencies and to oscillations in atmospheric and oceanic circulation.

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