Qingtian and Hulu Caves, China Deglacial Stalagmite Stable Isotope Data Zhang, W.; Wu, J.; Wang, Y.; Wang, Y.; Cheng, H.; Kong, X.; Duan, F. Zhang, W. Wu, J. Wang, Y. Wang, Y. Cheng, H. Kong, X. Duan, F. Monsoon earth science/paleoclimate/speleothems (depth,null,null,millimeter,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (age,null,null,calendar year before present,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems (delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems earth science/paleoclimate/speleothems (Hulu Cave>LATITUDE 32.5>LONGITUDE 119.16) (Qingtian Cave>LATITUDE 31.3333>LONGITUDE 110.3667) The 'Mystery Interval' (MI, 17.5-14.5 ka) was the first stage of the last deglaciation, a key interval for understanding mechanisms of glacial-interglacial cycles. To elucidate possible causes of the MI, here we present three high-resolution, precisely dated oxygen-isotope records of stalagmites from Qingtian and Hulu Caves in China, reflecting changes in the East Asian summer monsoon (EASM) then. Based on well-established chronologies using precise 230Th dates and annual-band counting results, the two-cave d18O profiles of ~ 7-yr resolution match well at decadal timescales. Both of the two-cave records document an abrupt weakening (2 per mil of d18O rise within 20 yr) in the EASM at ~ 16.1 ka, coinciding with the transition of the two-phased MI reconstructed from New Mexico's Lake Estancia. Our results indicate that the maximum southward displacement of the Intertropical Convergence Zone and associated southward shift of polar jet stream may generate this two-phase feature of the MI during that time. We also discover a linear relationship among decreasing EASM intensity, rising atmospheric CO2 and weakening Atlantic Meridional Overturning Circulation between the MI and Younger Dryas episodes, suggesting a strong coupling of atmospheric/oceanic circulations in response to the millennial-scale forcing, which in turn regulates global climate changes and carbon cycles. STUDY NOTES: Oxygen isotope (d18O) data from Qingtian and Hulu Caves, China plus carbon isotope (d13C) data from Hulu Cave, for the 'Mystery Interval' 17.5-14.5 ka. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Zhang, W. Investigator : Wu, J. Investigator : Wang, Y. Investigator : Wang, Y. Investigator : Cheng, H. Investigator : Kong, X. Investigator : Duan, F. 2015-10-27 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/19399 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/hulu2014yt16.1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/hulu2014yt.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/qingtian2014qt29.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/qingtian2014qt20.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/hulu2014yt16.1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/hulu2014yt.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/qingtian2014qt29.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/qingtian2014qt20.txt English https://www.ncdc.noaa.gov/paleo/study/19399 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/hulu2014yt16.1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/hulu2014yt.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/qingtian2014qt29.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/qingtian2014qt20.txt Weihong Zhang, Jiangying Wu, Yi Wang, Yongjin Wang, Hai Cheng, Xinggong Kong, Fucai Duan2014A detailed East Asian monsoon history surrounding the 'Mystery Interval' derived from three Chinese speleothem recordsQuaternary Research821154-16310.1016/j.yqres.2014.01.010http://www.sciencedirect.com/science/article/pii/S0033589414000131 START YEAR: 18332 cal yr BP * END YEAR: 14439 cal yr BP 110.3667 31.3333 119.16 32.5