# Mackenzie Delta, NW Canada 220 Year Spring-Summer Temperature Reconstruction #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 2.0 # 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/20930 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/canada/mackenzie2014iso-temp.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Climate Reconstructions # # Parameter_Keywords: air temperature #-------------------- # Contribution_Date # Date: 2016-11-21 #--------------------------------------- # Title # Study_Name: Mackenzie Delta, NW Canada 220 Year Spring-Summer Temperature Reconstruction #--------------------------------------- # Investigators # Investigators: Porter, T.J.; Pisaric, M.F.J. #--------------------------------------- # Description and Notes # Description: Spring-summer temperatures since AD 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the Mackenzie Delta, northwestern Canada. # The April-July minumum temperature reconstruction was developed based on a linear calibration of tree-ring d18O versus local climate data (1892-2003) from the Mackenzie Delta region, NWT, Canada. # # Provided Keywords: Mackenzie Delta, White spruce tree-rings, Stable oxygen isotope ratios, Atmospheric circulation, Temperature reconstruction, NASA-GISS ModelE #--------------------------------------- # Publication # Authors: Trevor J. Porter, Michael F.J. Pisaric, Robert D. Field, Steven V. Kokelj, Thomas W.D. Edwards, Peter deMontigny, Richard Healy, Allegra N. LeGrande # Published_Date_or_Year: 2014-02-01 # Published_Title: Spring-summer temperatures since AD 1780 reconstructed from stable oxygen isotope ratios in white spruce tree-rings from the Mackenzie Delta, northwestern Canada # Journal_Name: Climate Dynamics # Volume: 42 # Edition: # Issue: 3 # Pages: 771-785 # Report Number: # DOI: 10.1007/s00382-013-1674-3 # Online_Resource: http://link.springer.com/article/10.1007%2Fs00382-013-1674-3 # Full_Citation: # Abstract: High-latitude d18O archives deriving from meteoric water (e.g., tree-rings and ice-cores) can provide valuable information on past temperature variability, but stationarity of temperature signals in these archives depends on the stability of moisture source/trajectory and precipitation seasonality, both of which can be affected by atmospheric circulation changes. A tree-ring d18O record (AD 1780-2003) from the Mackenzie Delta is evaluated as a temperature proxy based on linear regression diagnostics. The primary source of moisture for this region is the North Pacific and, thus, North Pacific atmospheric circulation variability could potentially affect the tree-ring d18O-temperature signal. Over the instrumental period (AD 1892-2003), tree-ring d18O explained 29% of interannual variability in April-July minimum temperatures, and the explained variability increases substantially at lower-frequencies. A split-period calibration/verification analysis found the d18O-temperature relation was time-stable, which supported a temperature reconstruction back to AD 1780. The stability of the d18O-temperature signal indirectly implies the study region is insensitive to North Pacific circulation effects, since North Pacific circulation was not constant over the calibration period. Simulations from the NASA-GISS ModelE isotope-enabled general circulation model confirm that meteoric d18O and precipitation seasonality in the study region are likely insensitive to North Pacific circulation effects, highlighting the paleoclimatic value of tree-ring and possibly other d18O records from this region. Our d18O-based temperature reconstruction is the first of its kind in northwestern North America, and one of few worldwide, and provides a long-term context for evaluating recent climate warming in the Mackenzie Delta region. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Natural Sciences and Engineering Research Council of Canada # Grant: Discovery Grant #--------------------------------------- # Site Information # Site_Name: Mackenzie Delta # Location: North America>Canada>Northwest Territories # Country: Canada # Northernmost_Latitude: 68.4 # Southernmost_Latitude: 68.4 # Easternmost_Longitude: -133.8 # Westernmost_Longitude: -133.8 # Elevation: 5 m #--------------------------------------- # Data_Collection # Collection_Name: Mackenzie2014IsoTemp # First_Year: 1780 # Most_Recent_Year: 2003 # Time_Unit: AD # Core_Length: # Notes: The April-July minumum temperature reconstruction was developed based on a linear calibration of tree-ring d18O versus local climate data (1892-2003) from the Mackenzie Delta region, NWT, Canada. #--------------------------------------- # Species # Species_Name: Picea glauca # Common_Name: White spruce # Tree_Species_Code: PCGL #--------------------------------------- # Chronology_Information # Chronology: Absolute chronology known based on ring counting back in time from the year of sampling. Hundreds of tree-ring samples were cross-dated visually and statistically (Holmes, 1983) to ensure there were no locally absent rings. #--------------------------------------- # Variables # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ## age_AD Age, , , year AD, , , , ,N ## temp-AMJJmininst surface temperature minimum, , , deg C, April-May-June-July, Instrumental, Evironment Canada climate data, Regional intrumental temperature record,N ## trd18O delta 18O, cellulose, , per mille, , Tree Ring, ,,N ## temp-AMJJminrec surface temperature minimum, , , deg C, April-May-June-July, Climate Reconstructions, 1 standard error = +/- 1.24 deg C, linear regression,N # #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: -9999 # age_AD temp-AMJJmininst trd18O temp-AMJJminrec 1780 -9999 18.827 -5.11 1781 -9999 19.350 -4.59 1782 -9999 20.010 -3.92 1783 -9999 19.164 -4.77 1784 -9999 20.400 -3.53 1785 -9999 19.871 -4.06 1786 -9999 19.738 -4.19 1787 -9999 18.650 -5.29 1788 -9999 19.355 -4.58 1789 -9999 18.041 -5.91 1790 -9999 18.553 -5.39 1791 -9999 18.250 -5.69 1792 -9999 20.224 -3.70 1793 -9999 20.247 -3.68 1794 -9999 20.536 -3.39 1795 -9999 19.679 -4.25 1796 -9999 19.311 -4.62 1797 -9999 19.372 -4.56 1798 -9999 20.992 -2.93 1799 -9999 18.878 -5.06 1800 -9999 18.783 -5.16 1801 -9999 20.266 -3.66 1802 -9999 20.204 -3.72 1803 -9999 20.132 -3.80 1804 -9999 19.816 -4.12 1805 -9999 19.202 -4.73 1806 -9999 18.394 -5.55 1807 -9999 18.194 -5.75 1808 -9999 19.496 -4.44 1809 -9999 18.916 -5.02 1810 -9999 19.268 -4.67 1811 -9999 19.730 -4.20 1812 -9999 19.008 -4.93 1813 -9999 18.119 -5.83 1814 -9999 19.192 -4.74 1815 -9999 19.168 -4.77 1816 -9999 19.207 -4.73 1817 -9999 19.489 -4.45 1818 -9999 20.412 -3.51 1819 -9999 19.741 -4.19 1820 -9999 20.785 -3.14 1821 -9999 20.312 -3.62 1822 -9999 19.728 -4.20 1823 -9999 19.832 -4.10 1824 -9999 19.378 -4.56 1825 -9999 19.326 -4.61 1826 -9999 19.990 -3.94 1827 -9999 20.173 -3.76 1828 -9999 20.134 -3.79 1829 -9999 19.893 -4.04 1830 -9999 19.959 -3.97 1831 -9999 18.793 -5.15 1832 -9999 19.052 -4.89 1833 -9999 19.206 -4.73 1834 -9999 20.107 -3.82 1835 -9999 20.119 -3.81 1836 -9999 19.839 -4.09 1837 -9999 21.442 -2.48 1838 -9999 20.421 -3.50 1839 -9999 19.670 -4.26 1840 -9999 20.525 -3.40 1841 -9999 19.405 -4.53 1842 -9999 19.049 -4.89 1843 -9999 19.877 -4.05 1844 -9999 19.998 -3.93 1845 -9999 20.597 -3.33 1846 -9999 20.680 -3.24 1847 -9999 19.507 -4.43 1848 -9999 19.745 -4.19 1849 -9999 19.965 -3.97 1850 -9999 19.530 -4.40 1851 -9999 19.688 -4.24 1852 -9999 20.120 -3.81 1853 -9999 19.685 -4.25 1854 -9999 19.442 -4.49 1855 -9999 19.984 -3.95 1856 -9999 18.915 -5.02 1857 -9999 19.888 -4.04 1858 -9999 20.342 -3.59 1859 -9999 21.380 -2.54 1860 -9999 19.873 -4.06 1861 -9999 19.798 -4.13 1862 -9999 19.495 -4.44 1863 -9999 19.305 -4.63 1864 -9999 19.251 -4.68 1865 -9999 19.740 -4.19 1866 -9999 19.630 -4.30 1867 -9999 20.560 -3.36 1868 -9999 19.706 -4.23 1869 -9999 19.770 -4.16 1870 -9999 19.110 -4.83 1871 -9999 19.734 -4.20 1872 -9999 21.109 -2.81 1873 -9999 20.278 -3.65 1874 -9999 20.119 -3.81 1875 -9999 20.045 -3.88 1876 -9999 20.641 -3.28 1877 -9999 19.430 -4.50 1878 -9999 20.418 -3.51 1879 -9999 20.660 -3.26 1880 -9999 19.520 -4.41 1881 -9999 19.261 -4.68 1882 -9999 19.867 -4.06 1883 -9999 20.976 -2.95 1884 -9999 19.837 -4.09 1885 -9999 20.806 -3.12 1886 -9999 20.320 -3.61 1887 -9999 19.918 -4.01 1888 -9999 19.222 -4.71 1889 -9999 19.957 -3.97 1890 -9999 20.160 -3.77 1891 -9999 20.219 -3.71 1892 -9999 19.883 -4.05 1893 -4.90 19.482 -4.45 1894 -7.39 17.533 -6.42 1895 -9999 19.740 -4.19 1896 -6.07 18.780 -5.16 1897 -5.04 19.019 -4.92 1898 -9999 20.454 -3.47 1899 -4.98 19.638 -4.29 1900 -4.24 20.009 -3.92 1901 -9999 19.156 -4.78 1902 -9999 19.669 -4.26 1903 -9999 19.602 -4.33 1904 -9999 19.063 -4.88 1905 -9999 19.819 -4.11 1906 -9999 20.615 -3.31 1907 -9999 20.962 -2.96 1908 -3.81 20.280 -3.65 1909 -9999 20.039 -3.89 1910 -3.97 19.472 -4.46 1911 -3.48 21.221 -2.70 1912 -4.24 21.498 -2.42 1913 -4.35 20.958 -2.96 1914 -3.42 21.310 -2.61 1915 -2.11 20.681 -3.24 1916 -1.81 21.047 -2.87 1917 -5.56 21.124 -2.80 1918 -5.99 20.048 -3.88 1919 -4.53 19.399 -4.54 1920 -4.45 19.807 -4.12 1921 -2.33 19.875 -4.06 1922 -4.45 19.584 -4.35 1923 -3.48 20.211 -3.72 1924 -6.12 19.945 -3.99 1925 -2.80 22.315 -1.59 1926 -2.76 20.586 -3.34 1927 -3.74 21.042 -2.88 1928 -4.89 21.117 -2.80 1929 -2.96 21.209 -2.71 1930 -3.03 20.529 -3.40 1931 -3.73 19.883 -4.05 1932 -1.59 20.800 -3.12 1933 -3.85 21.126 -2.79 1934 -3.35 20.811 -3.11 1935 -5.56 20.241 -3.69 1936 -4.37 20.099 -3.83 1937 -3.62 20.081 -3.85 1938 -2.73 20.342 -3.59 1939 -1.27 21.421 -2.50 1940 -2.30 21.284 -2.63 1941 -2.69 20.746 -3.18 1942 -2.74 20.532 -3.39 1943 -1.64 20.466 -3.46 1944 -1.61 20.924 -3.00 1945 -4.11 20.014 -3.92 1946 -2.68 21.272 -2.65 1947 -4.33 20.270 -3.66 1948 -3.67 20.546 -3.38 1949 -4.92 19.702 -4.23 1950 -2.71 20.785 -3.14 1951 -3.72 19.989 -3.94 1952 -3.74 21.601 -2.32 1953 -2.01 20.907 -3.02 1954 -5.70 20.558 -3.37 1955 -2.55 19.727 -4.20 1956 -3.32 20.346 -3.58 1957 -3.27 19.944 -3.99 1958 -1.62 21.456 -2.46 1959 -4.65 19.557 -4.38 1960 -3.27 19.484 -4.45 1961 -4.46 20.220 -3.71 1962 -4.01 19.961 -3.97 1963 -1.98 19.955 -3.98 1964 -5.97 21.028 -2.89 1965 -2.76 20.598 -3.33 1966 -4.76 20.337 -3.59 1967 -3.79 20.184 -3.74 1968 -3.97 21.106 -2.81 1969 -2.39 20.614 -3.31 1970 -3.07 21.095 -2.82 1971 -3.40 21.766 -2.15 1972 -4.49 20.910 -3.01 1973 -1.80 20.274 -3.65 1974 -5.52 20.504 -3.42 1975 -2.27 19.305 -4.63 1976 -1.76 20.458 -3.47 1977 -2.83 21.283 -2.64 1978 -4.37 20.738 -3.19 1979 -2.84 20.885 -3.04 1980 -2.76 20.403 -3.52 1981 -1.59 20.442 -3.48 1982 -2.67 21.117 -2.80 1983 -3.71 21.116 -2.80 1984 -1.38 20.486 -3.44 1985 -4.56 21.034 -2.89 1986 -4.78 20.110 -3.82 1987 -3.54 22.242 -1.67 1988 -0.93 21.209 -2.71 1989 -1.50 21.227 -2.69 1990 -0.44 21.969 -1.94 1991 -0.90 21.530 -2.39 1992 -3.73 21.034 -2.89 1993 -1.41 21.308 -2.61 1994 -1.42 20.977 -2.94 1995 -0.57 21.928 -1.99 1996 -3.04 21.043 -2.88 1997 -1.83 21.225 -2.69 1998 1.91 22.511 -1.40 1999 -2.40 21.221 -2.70 2000 -3.16 21.031 -2.89 2001 -2.67 21.556 -2.36 2002 -2.89 22.010 -1.90 2003 -1.32 21.785 -2.13