# Qingtian and Hulu Caves, China Deglacial Stalagmite Stable Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/19399 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/hulu2014yt16.1.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Speleothems # # Parameter_Keywords: oxygen isotopes, carbon isotopes #-------------------- # Contribution_Date # Date: 2015-10-27 #-------------------- # Title # Study_Name: Qingtian and Hulu Caves, China Deglacial Stalagmite Stable Isotope Data #-------------------- # Investigators # Investigators: Zhang, W.; Wu, J.; Wang, Y.; Wang, Y.; Cheng, H.; Kong, X.; Duan, F. #-------------------- # Description_and_Notes # Description: 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. #-------------------- # Publication # Authors: Weihong Zhang, Jiangying Wu, Yi Wang, Yongjin Wang, Hai Cheng, Xinggong Kong, Fucai Duan # Published_Date_or_Year: 2014-07-01 # Published_Title: A detailed East Asian monsoon history surrounding the 'Mystery Interval' derived from three Chinese speleothem records # Journal_Name: Quaternary Research # Volume: 82 # Edition: # Issue: 1 # Pages: 154-163 # Report_Number: # DOI: 10.1016/j.yqres.2014.01.010 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0033589414000131 # Full_Citation: # Abstract: 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. #------------------ # Funding_Agency # Funding_Agency_Name: National Natural Science Foundation of China # Grant: 40972111, 41130210 #------------------ # Funding_Agency # Funding_Agency_Name: Research and Innovation Project for College Graduates of Jiangsu Province # Grant: CXZZ13_0408 #------------------ # Site_Information # Site_Name: Hulu Cave # Location: Asia>Eastern Asia>China # Country: China # Northernmost_Latitude: 32.5 # Southernmost_Latitude: 32.5 # Easternmost_Longitude: 119.1667 # Westernmost_Longitude: 119.1667 # Elevation: 90 m #------------------ # Data_Collection # Collection_Name: Hulu2014YT16.1 # Earliest_Year: 16150 # Most_Recent_Year: 16117 # Time_Unit: Cal. Year BP # Core_Length: m # Notes: #------------------ # Chronology_Information # Chronology: # # # Table 1. 230Th dating results for stalagmites QT20 and QT29 from Qingtian Cave (central China) and stalagmite YT from Hulu Cave (eastern China). # # Sample Depth 238U 232Th d234U 230Th/238U 230Th Age/yr 230Th Age/yr d234Uinitial # ID (mm) (ppb) (ppt) (Measured) (Activity) (Uncorrected) (Corrected) (Corrected) # QT20 23 1760.7 ±5.2 2916 ±52 -186.2 ±1.9 0.1114 ±0.0009 16165 ±148 16105 ±151 195 ±2.0 # QT20 81 1678.4 ±0.12 6331 ±65 -207.1 ±0.4 0.1133 ±0.0002 16931 ±27 16734 ±103 -217 ±0.4 # QT20 169 1128.2 ±3.6 1112 ±60 -181.5 ±2.5 0.1206 ±0.0010 17510 ±174 17474 ±174 -191 ±2.7 # QT29 56 1660.5 ±2.1 114 ±8 213.9 ±1.6 0.1786 ±0.0007 17272 ±74 17271 ±74 225 ±2 # QT29 107 877.1 ±1.6 622 ±18 221.8 ±2.2 0.1856 ±0.0008 17907 ±91 17890 ±91 233.3 ±2.3 # QT29 164 1985.4 ±4.1 137 ±17 265.5 ±2.8 0.1955 ±0.0007 18218 ±82 18216 ±82 279.6 ±2.9 # YT 163 189.2 ±0.4 250 ±5 163.8 ±2.4 0.1788 ±0.0014 18101 ±163 18069 ±164 172.4 ±2.5 # Errors are 2 sigma analytical errors. # Decay constant values are L230 = 9.1577 x 10-6 yr-1, L234 = 2.8263 x 10-6 yr-1, L238 = 1.55125 x 10-10 yr-1. # Corrected 230Th ages assume an initial 230Th/232Th atomic ratio of (4.4±2.2) x10-6. # Corrected 230Th ages are presented in years before 2000 AD. # # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ## age_calBP age, , , calendar years before present, , , , ,N ## d18OcarbVPDB delta18O, calcium carbonate, , per mil VPDB, ,speleothem, , ,N # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # Data on the detailed monsoon transtion in stalagmite YT at ~16.1 kyr B.P. # age_calBP d18OcarbVPDB 16117 -4.346 16119 -4.286 16121 -4.374 16122 -4.243 16123 -4.488 16123.5 -4.603 16124 -4.599 16125 -4.811 16126 -5.02 16126.5 -5.12 16127 -4.999 16127.5 -5.149 16128 -5.396 16129 -5.306 16130 -5.621 16131 -5.535 16132 -5.574 16133 -5.682 16134 -5.9 16134.5 -5.665 16135 -6.147 16135.5 -5.786 16136 -5.857 16136.5 -5.907 16137 -6.105 16137.5 -5.982 16138 -6.296 16138.5 -6.487 16139 -6.456 16140 -6.567 16141 -6.562 16141.5 -6.576 16142 -6.748 16142.5 -6.568 16143 -6.487 16143.3 -6.589 16143.7 -6.297 16144 -6.217 16144.5 -6.189 16145 -6.1 16146 -6.163 16147 -6.201 16148 -6.547 16149 -6.478 16150 -6.506