The East Asian monsoon during MIS 2 expressed in a speleothem δO record from Jintanwan Cave, Hunan, China |
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| Authors: | Jason Cosford Hairuo Qing Yin Lin Bruce Eglington Dave Mattey Yue Gau Chen Meiliang Zhang Hai Cheng |
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| Institution: | aDepartment of Geology, University of Regina, Regina, SK, Canada S4S 0A2;bDepartment of Geosciences, National Taiwan University, Taipei, Taiwan (R.O.C.) 10611;cSaskatchewan Isotope Laboratory, Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada S7N 5E2;dDepartment of Geology, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK;eInstitute of Karst Geology, Chinese Academy of Geological Science, Guilin, China, 541004;fDepartment of Geology and Geophysics, University of Minnesota, Twin Cities, MN 55455, USA |
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| Abstract: | Stalagmite J1 from Jintanwan Cave, Hunan, China, provides a precisely dated, decadally resolved δ18O 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 δ18O 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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| Keywords: | Stalagmite Oxygen isotopes East Asian monsoon Last glacial maximum |
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