# 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/qingtian2014qt29.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: Qingtian Cave # Location: Asia>Eastern Asia>China # Country: China # Northernmost_Latitude: 31.3333 # Southernmost_Latitude: 31.3333 # Easternmost_Longitude: 110.3667 # Westernmost_Longitude: 110.3667 # Elevation: 1630 m #------------------ # Data_Collection # Collection_Name: Qingtian2014Qt29 # Earliest_Year: 18216 # Most_Recent_Year: 17271 # 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) # ## depth_mm depth, , , mm, , , , ,N ## 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: # depth_mm age_calBP d18OcarbVPDB 56 17271 -5.707 57 17283 -5.709 58 17295 -5.579 59 17307 -5.587 60 17320 -5.458 61 17332 -5.771 62 17344 -5.755 63 17356 -5.668 64 17368 -5.824 65 17380 -6.198 66 17392 -6.214 67 17405 -5.848 68 17417 -5.677 69 17429 -6.515 70 17441 -6.229 71 17453 -6.046 72 17465 -6.299 73 17477 -6.296 74 17489 -6.1 75 17502 -6.157 76 17514 -6.38 77 17526 -5.733 78 17538 -6.289 79 17550 -5.977 80 17562 -6.655 81 17574 -5.784 82 17587 -5.843 83 17599 -5.691 84 17611 -5.98 85 17623 -6.227 86 17635 -6.404 87 17647 -5.993 88 17659 -6.269 89 17672 -5.838 90 17684 -5.9 91 17696 -5.877 92 17708 -6.086 93 17720 -6.487 94 17732 -6.739 95 17744 -6.753 96 17756 -6.956 97 17769 -7.294 98 17781 -6.644 99 17793 -6.484 100 17805 -6.673 101 17817 -6.708 102 17829 -6.318 103 17841 -6.811 104 17854 -7.467 105 17866 -6.749 106 17878 -7.035 107 17890 -7.391 108 17896 -6.931 109 17902 -6.878 110 17907 -6.45 111 17913 -5.823 112 17919 -5.936 113 17925 -6.677 114 17931 -6.765 115 17937 -6.377 116 17942 -6.615 117 17948 -6.727 118 17954 -6.88 119 17960 -7.067 120 17966 -7.124 121 17972 -7.311 122 17977 -7.227 123 17983 -7.259 124 17989 -6.965 125 17995 -7.263 126 18001 -7.427 127 18006 -7.667 128 18012 -7.631 129 18018 -7.6 130 18024 -7.701 131 18030 -7.771 132 18036 -7.562 133 18041 -7.531 134 18047 -7.563 135 18053 -7.563 136 18059 -7.048 137 18065 -7.102 138 18070 -7.278 139 18076 -7.328 140 18082 -7.167 141 18088 -7.195 142 18094 -7.042 143 18100 -7.189 144 18105 -7.682 145 18111 -7.342 146 18117 -7.393 147 18123 -7.027 148 18129 -7.008 149 18135 -6.756 150 18140 -6.872 151 18146 -7.175 152 18152 -7.113 153 18158 -7.245 154 18164 -7.38 155 18169 -7.606 156 18175 -7.383 157 18181 -7.029 158 18187 -6.659 159 18193 -6.438 160 18199 -6.57 161 18204 -6.743 162 18210 -7.043 163 18216 -7.331