# Wache, Bhutan 269 Year Tree Ring Oxygen 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/22548 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/asia/bhutan/wache2013d18o.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Tree Ring # # Dataset DOI: # # Parameter_Keywords: oxygen isotopes #-------------------- # Contribution_Date # Date: 2017-08-23 #-------------------- # File_Last_Modified_Date # Date: 2017-08-23 #-------------------- # Title # Study_Name: Wache, Bhutan 269 Year Tree Ring Oxygen Isotope Data #-------------------- # Investigators # Investigators: Sano, M.; Tshering, P.; Komori, J.; Fujita, K.; Xu, C.; Nakatsuka, T. #-------------------- # Description_Notes_and_Keywords # Description: Larix griffithii tree-ring oxygen isotope (d18O) data from Wache, Lunana, Bhutan, for the past 269 years. #-------------------- # Publication # Authors: Masaki Sano, Phuntsho Tshering, Jiro Komori, Koji Fujita, Chenxi Xu, Takeshi Nakatsuka # Published_Date_or_Year: 2013-08-16 # Published_Title: May-September precipitation in the Bhutan Himalaya since 1743 as reconstructed from tree ring cellulose d18O # Journal_Name: Journal of Geophysical Research: Atmospheres # Volume: 118 # Edition: # Issue: 15 # Pages: 8399-8410 # Report_Number: # DOI: 10.1002/jgrd.50664 # Online_Resource: http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50664/full # Full_Citation: # Abstract: We developed a 50-year tree ring d18O chronology for each of three tree species (Juniperus indica, Larix griffithii, and Picea spinulosa) using a total of 12 trees (four trees per species) from the Bhutan Himalaya. Despite originating from different species sampled at two different altitudes, the d18O chronologies are highly correlated with one another (r = 0.76-0.89). Response analyses reveal that tree ring d18O values are controlled mainly by summer precipitation, irrespective of species. Based on these results, a robust 269-year d18O chronology was established to reconstruct the amount of May-September precipitation based on data from four larch trees. Our tree ring d18O data show significant correlations with those from other regions of the Himalaya and the Tibetan Plateau, indicating that common signals related to monsoon activity are recorded in the data. However, at centennial timescales, our data from Bhutan show normal conditions during the 20th century, whereas records from sites in western Nepal and the southern/eastern Tibetan Plateau show weakening trends in monsoon intensity during the last 100-200 years; the weakening trends may be the result of a reduction in the meridional sea surface temperature gradient in the Indian Ocean during this time. At continental scales, the tree ring records show that areas more from ocean basins are particularly sensitive to reduced monsoon circulation. Correlation analyses suggest that the El Niņo-Southern Oscillation (ENSO) plays an important role in modulating summer precipitation. However, the teleconnected relationship disappears during the period 1951-1970, coinciding with a negative phase of the Pacific Decadal Oscillation (PDO), implying interdecadal modulation of the PDO on the influence of the ENSO on precipitation in Bhutan. #------------------ # Funding_Agency # Funding_Agency_Name: Japan Society for the Promotion of Science # Grant: 19253001, 2310262, and 23242047 #------------------ # Funding_Agency # Funding_Agency_Name: Research Institute of Humanity and Nature, Japan # Grant: #------------------ # Site_Information # Site_Name: Wache # Location: Asia>Southcentral Asia>Bhutan # Country: Bhutan # Northernmost_Latitude: 27.983 # Southernmost_Latitude: 27.983 # Easternmost_Longitude: 90.0 # Westernmost_Longitude: 90.0 # Elevation: 3500 m #------------------ # Data_Collection # Collection_Name: Wache2013d18O # Earliest_Year: 1743 # Most_Recent_Year: 2011 # Time_Unit: CE # Core_Length: # Notes: #------------------ # Species # Species_Name: Larix griffithii # Common_Name: Sikkim larch # Tree_Species_Code: LAGR #------------------ # Chronology_Information # Chronology: # #----------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## age_CE age, , , year CE, , , , ,N, ## d18OcellVSMOW delta18O, cellulose, , per mil VSMOW, annual, tree ring, , ,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age_CE d18OcellVSMOW 1743 19.11 1744 18.20 1745 19.26 1746 18.76 1747 21.40 1748 20.40 1749 20.86 1750 19.06 1751 18.85 1752 20.06 1753 20.89 1754 18.71 1755 19.36 1756 19.55 1757 18.25 1758 19.86 1759 18.33 1760 17.25 1761 18.68 1762 18.68 1763 18.48 1764 19.66 1765 18.33 1766 18.86 1767 17.83 1768 19.88 1769 21.61 1770 19.91 1771 18.50 1772 20.95 1773 19.58 1774 19.57 1775 19.42 1776 19.64 1777 19.09 1778 19.41 1779 21.65 1780 18.99 1781 19.27 1782 19.55 1783 22.61 1784 21.72 1785 19.13 1786 21.25 1787 19.51 1788 20.54 1789 18.96 1790 19.60 1791 18.67 1792 19.87 1793 19.58 1794 20.07 1795 19.27 1796 18.74 1797 21.07 1798 19.03 1799 19.53 1800 17.54 1801 16.51 1802 18.68 1803 19.82 1804 19.65 1805 19.16 1806 17.66 1807 20.08 1808 20.37 1809 20.16 1810 19.12 1811 18.53 1812 19.29 1813 19.99 1814 19.16 1815 17.76 1816 19.70 1817 19.45 1818 19.27 1819 20.01 1820 18.01 1821 18.92 1822 17.81 1823 16.41 1824 19.43 1825 20.63 1826 18.24 1827 18.53 1828 18.40 1829 18.23 1830 17.57 1831 18.80 1832 17.88 1833 18.86 1834 17.41 1835 18.17 1836 19.11 1837 18.88 1838 19.02 1839 17.98 1840 18.25 1841 19.91 1842 18.61 1843 19.70 1844 19.52 1845 20.65 1846 17.75 1847 18.44 1848 19.24 1849 19.98 1850 19.01 1851 19.23 1852 18.31 1853 18.22 1854 18.33 1855 19.51 1856 16.23 1857 19.59 1858 18.86 1859 18.17 1860 18.69 1861 16.80 1862 17.75 1863 17.30 1864 19.36 1865 19.24 1866 18.49 1867 18.06 1868 19.77 1869 20.08 1870 17.90 1871 17.04 1872 20.19 1873 21.58 1874 19.34 1875 19.01 1876 20.37 1877 20.77 1878 18.48 1879 16.20 1880 18.98 1881 19.08 1882 18.63 1883 18.67 1884 21.90 1885 19.08 1886 18.58 1887 18.78 1888 19.31 1889 19.07 1890 18.50 1891 19.77 1892 19.36 1893 17.17 1894 18.69 1895 19.70 1896 21.67 1897 18.69 1898 18.42 1899 18.36 1900 18.62 1901 19.75 1902 19.64 1903 19.93 1904 19.58 1905 19.30 1906 19.67 1907 21.08 1908 21.42 1909 18.82 1910 17.58 1911 18.58 1912 19.91 1913 20.87 1914 19.98 1915 20.14 1916 18.03 1917 18.48 1918 19.16 1919 20.28 1920 21.11 1921 18.99 1922 18.09 1923 20.25 1924 18.40 1925 18.60 1926 19.65 1927 19.42 1928 19.47 1929 19.52 1930 19.98 1931 19.25 1932 20.54 1933 18.69 1934 18.44 1935 19.03 1936 19.46 1937 18.76 1938 16.99 1939 20.11 1940 20.09 1941 21.05 1942 18.73 1943 19.51 1944 19.51 1945 19.35 1946 20.43 1947 19.27 1948 18.79 1949 18.73 1950 18.91 1951 19.45 1952 19.79 1953 18.62 1954 18.93 1955 18.67 1956 20.03 1957 19.26 1958 20.07 1959 20.17 1960 19.39 1961 19.28 1962 18.16 1963 18.16 1964 18.47 1965 20.14 1966 20.12 1967 20.22 1968 19.57 1969 19.51 1970 20.05 1971 19.73 1972 22.69 1973 20.71 1974 19.01 1975 18.17 1976 20.47 1977 19.04 1978 18.11 1979 19.66 1980 18.58 1981 18.74 1982 22.29 1983 20.70 1984 18.18 1985 18.56 1986 19.85 1987 20.04 1988 18.13 1989 17.74 1990 19.58 1991 18.97 1992 19.38 1993 19.77 1994 20.55 1995 19.52 1996 17.27 1997 20.16 1998 17.69 1999 19.01 2000 18.66 2001 19.22 2002 20.15 2003 18.99 2004 20.09 2005 20.06 2006 20.70 2007 19.12 2008 19.60 2009 20.01 2010 18.34 2011 18.16