# Xiaobailong Cave, Southwest China 240 Year Speleothem Stable Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # 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/23211 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/xiaobailong2017.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Speleothems # # Dataset DOI: # # Parameter_Keywords: oxygen isotopes, carbon isotopes #-------------------- # Contribution_Date # Date: 2017-12-07 #-------------------- # File_Last_Modified_Date # Date: 2017-12-07 #-------------------- # Title # Study_Name: Xiaobailong Cave, Southwest China 240 Year Speleothem Stable Isotope Data #-------------------- # Investigators # Investigators: Tan, L.; Cai, Y.; An, Z.; Cheng, H.; Shen, C.-C.; Gao, Y.; Edwards, R.L. #-------------------- # Description_and_Notes # Description: Speleothem oxygen and carbon isotope records from Xiaobailong Cave, Southwest China over the last 240 years. # Provided Keywords: Speleothem, oxygen and carbon isotope, Xiaobailong cave, paleoclimate #-------------------- # Publication # Authors: Liangcheng Tan, Yanjun Cai, Zhisheng An, Hai Cheng, Chuan-Chou Shen, Yongli Gao, R. Lawrence Edwards # Published_Date_or_Year: 2017-03-01 # Published_Title: Decreasing monsoon precipitation in southwest China during the last 240 years associated with the warming of tropical ocean # Journal_Name: Climate Dynamics # Volume: 48 # Edition: # Issue:5-6 # Pages: 1769-1778 # Report_Number: # DOI: 10.1007/s00382-016-3171-y # Online_Resource: https://link.springer.com/article/10.1007/s00382-016-3171-y # Full_Citation: # Abstract: Based on an absolutely dated stalagmite d18O record from Yunnan province, China, we reconstructed monsoon precipitation variations in southwest China since 1760 AD with a resolution of about 2 years. Combining the speleothem d18O and observed rainfall records, we find an overall decreasing trend in monsoon precipitation in this region and suggest that the recent drought in 2009-2012 AD has been the driest since 1760 AD. Our speleothem record is consistent with the monsoon precipitation records reconstructed from tree rings in the Nepal Himalaya and southeastern Tibetan Plateau. However, it is anti-correlated with a speleothem record from central India, which confirms the observed anti-phase variations of Indian monsoon precipitation with moistures from the Bay of Bengal and Arabian Sea on multi-decadal to centennial timescales during historical time. The long-term warming of tropical ocean may have caused the decrease of the land-sea thermal gradient and the amount of moisture transported from the Bay of Bengal, which may reduce precipitations in southwest China during the last 240 years. On decadal scale, El Nino-like conditions of tropical Pacific sea surface temperature may cause drought in this region. Climate model simulations suggest El Niño-like conditions exist in tropical Pacific under global warming scenarios. As a result, it is crucial to have adaptive strategies to overcome future declines in precipitation and/or drought events in southwest China. #------------------ # Funding_Agency # Funding_Agency_Name: National Key Basic Research Program of China # Grant: 2013CB955902 #------------------ # Funding_Agency # Funding_Agency_Name: National Natural Science Foundation of China # Grant: 41372192; 41230524 #------------------ # Funding_Agency # Funding_Agency_Name: West Light Foundation of Chinese Academy of Sciences # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Youth Innovation Promotion Association of Chinese Academy of Sciences # Grant: 2012295 #------------------ # Site_Information # Site_Name: Xiaobailong Cave # Location: Southwest China # Country: China # Northernmost_Latitude: 24.2 # Southernmost_Latitude: 24.2 # Easternmost_Longitude: 103.35 # Westernmost_Longitude: 103.35 # Elevation: 1500 m #------------------ # Data_Collection # Collection_Name: Xiaobailong2017 # Earliest_Year: 1760 # Most_Recent_Year: 1981 # Time_Unit: CE # Core_Length: 0.075 m # Notes: #------------------ # Chronology_Information # Chronology: # Table 1 U-Th isotopic data and 230Th dates of stalagmite XBL41 # # Sample Depth 238U 232Th 230Th / 232Th d234U 230Th / 238U 230Th Age (yr) 230Th Age (yr BP) 230Th Age (yr AD) d234UInitial # ID (cm) (ppb) (ppt) (atomic x10-6) (measured) (activity) (uncorrected) (corrected) (corrected) (corrected) # # XBL41-1 5.75 18,167 ± 71 77 ± 6 9468 ± 736 86.1 ± 2.1 0.00242 ± 0.00004 243 ± 4 186 ± 4 1764 ± 4 86.2 ± 2.1 # XBL41-2 4.4 11,569 ± 28 256 ± 6 1524 ± 36 78.1 ± 2.2 0.00204 ± 0.00002 207 ± 2 149 ± 2 1801 ± 2 78.2 ± 2.2 # XBL41-3 3.8 11,445 ± 37 200 ± 5 1800 ± 53 63.3 ± 2.0 0.00191 ± 0.00003 196 ± 3 132 ± 3 1819 ± 3 63.3 ± 2.0 # XBL41-2A 3.65 16,925 ± 56 216 ± 5 2245 ± 55 67.1 ± 1.9 0.00174 ± 0.00001 178 ± 1 112 ± 1 1838 ± 1 67.1 ± 1.9 # XBL41-4 2.95 13,094 ± 30 32 ± 6 8157 ± 1432 65.3 ± 2.0 0.00122 ± 0.00001 125 ± 1 112 ± 1 1882 ± 1 65.3 ± 2.0 # XBL41-1A 1.8 27,235 ± 143 292 ± 8 1254 ± 40 58.9 ± 2.5 0.00082 ± 0.00001 84 ± 1 68 ± 1 1931 ± 1 58.9 ± 2.5 # XBL41-5 0.95 26,949 ± 77 11 ± 6 14,261 ± 7241 62.5 ± 2.2 0.00036 ± 0.00001 37 ± 1 19 ± 1 1970 ± 1 62.5 ± 2.2 # XBL41-6 0.65 31,462 ± 255 197 ± 4 782 ± 19 67.6 ± 3.8 0.00030 ± 0.000004 30 ± 0.4 -30 ± 0.4 1980 ± 0.4 67.7 ± 3.8 # XBL41-7 0.4 1606 ± 2 20,684 ± 415 18 ± 0.4 55.1 ± 1.6 0.01369 ± 0.0001 1423 ± 13 1004 ± 252 946 ± 252 55.3 ± 1.6 # XBL41-8 0.1 4002 ± 14 135 ± 4 -3 ± 17 57.6 ± 2.2 -0.00001 ± 0.00004 -1 ± 4 -59 ± 4 2009 ± 4 57.6 ± 2.2 # # The errors are 2s errors. Decay constant values are: Lambda230 = 9.1705 x 10-6/a, Lambda234 = 2.82206 x 10-6/a (Cheng et al. 2013) and # Lambda238 = 1.55125 x 10-10 year-1 (Jaffey et al. 1971). Corrected 230Th ages assume the initial 230Th/232Th atomic ratio of 4.4 ± 2.2 x 10-6. # Depths along the growth axes are relative to the top (youngest surface) of the stalagmite. Year BP: year before present (1950 AD). # XBL41-1A and XBL41-2A were dated at Xi'an Jiaotong University, China. The other subsamples were dated at the University of Minnesota, USA #---------------- # 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_CE age, , , CE, , , , ,N, ## d13C delta 13C, calcium carbonate, , per mil VPDB, ,speleothem, , ,N, ## d18O delta 18O, 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: # age_CE d13C d18O 1981 -4.81 -8.97 1980 -4.87 -8.9 1979 -4.99 -8.83 1977 -4.92 -9 1976 -4.65 -9.1 1974 -4.59 -9.06 1973 -4.95 -9.48 1971 -4.86 -9.16 1968 -4.71 -8.91 1965 -4.51 -8.82 1963 -5.21 -9.78 1961 -5.21 -9.7 1959 -4.45 -9.36 1956 -4.26 -9.4 1954 -3.92 -9.33 1952 -3.91 -9.05 1949 -4.19 -9.22 1947 -4.32 -9.32 1945 -4.11 -9.08 1942 -4.35 -9.05 1940 -4.23 -9.32 1938 -4.01 -9.39 1936 -4.31 -9.13 1933 -5.06 -9.18 1931 -5.26 -9.46 1929 -5 -9.35 1927 -5.07 -9.4 1925 -5 -9.55 1922 -5.1 -10.1 1920 -4.97 -9.6 1918 -5.04 -9.51 1916 -4.92 -9.42 1914 -4.85 -9.41 1912 -4.87 -9.41 1910 -5.08 -9.21 1908 -5.04 -9.16 1905 -5.31 -9.81 1903 -5.34 -9.99 1901 -5.14 -10.51 1899 -5.06 -10.43 1897 -4.88 -9.63 1895 -4.96 -9.72 1893 -4.91 -9.75 1891 -4.81 -9.75 1888 -4.69 -10.32 1886 -4.78 -10.51 1884 -4.54 -10.13 1882 -4.46 -9.99 1879 -4.67 -9.29 1875 -4.72 -9.81 1872 -5.02 -10.02 1868 -5.14 -9.86 1865 -5.22 -9.48 1862 -5.45 -9 1858 -5.3 -8.77 1855 -5.28 -8.75 1852 -5.26 -8.9 1848 -5.61 -9.58 1845 -5.82 -9.58 1841 -5.88 -9.48 1838 -5.78 -9.33 1833 -5.89 -9.28 1829 -5.7 -9.25 1824 -5.57 -9.41 1819 -5.3 -9.31 1818 -5.22 -9.2 1816 -5.3 -9.52 1815 -5.3 -9.64 1813 -5.27 -9.66 1812 -5.39 -9.65 1810 -5.53 -10.17 1809 -5.53 -10.24 1807 -5.5 -10.29 1806 -5.75 -10.74 1804 -5.83 -10.83 1803 -5.62 -10.31 1801 -5.87 -10 1800 -6.14 -9.64 1798 -6.12 -9.67 1797 -6.25 -9.3 1796 -6.16 -9.21 1794 -6.53 -9.2 1793 -6.43 -9.32 1791 -6.75 -9.6 1790 -6.38 -9.74 1789 -6.76 -10.2 1787 -6.54 -10.08 1786 -6.53 -10.05 1785 -6.46 -10.52 1783 -6.43 -10.36 1782 -6.43 -10.32 1780 -6.36 -10.29 1779 -5.83 -10.83 1778 -6.53 -10.01 1776 -6.75 -10.12 1775 -7.19 -10.96 1774 -6.89 -10.77 1772 -6.81 -10.7 1771 -6.83 -10.39 1769 -6.31 -10.09 1768 -6.93 -9.95 1767 -7.16 -10.41 1765 -7.62 -10.49 1764 -7.98 -10.79 1763 -7.7 -10.73 1761 -7.69 -10.33 1760 -7.3 -9.96