Winnipeg River Basin Regional Ringwidth Series ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Winnipeg River Basin Regional Ringwidth Series LAST UPDATE: 7/2008 (Original receipt by WDC Paleo) CONTRIBUTOR: Scott St. George, Geological Survey of Canada. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2008-065 WDC PALEO CONTRIBUTION SERIES CITATION: St. George, S., et al.. 2008. Winnipeg River Basin Regional Ringwidth Series. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2008-065. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: St. George, S., D.M. Meko, and M.N. Evans. 2008. Regional tree growth and inferred summer climate in the Winnipeg River basin, Canada since AD 1783. Quaternary Research, Vol. 70, Issue 2, pp. 158-172, September 2008. doi:10.1016/j.yqres.2008.04.009 ABSTRACT: A network of 54 ring-width chronologies is used to estimate changes in summer climate within the Winnipeg River basin, Canada, since AD 1783. The basin drains parts of northwestern Ontario, northern Minnesota and southeastern Manitoba, and is a key area for hydroelectric power production. Most chronologies were developed from Pinus resinosa and P. strobus, with a limited number of Thuja occidentalis, Picea glauca and Pinus banksiana. The dominant pattern of regional tree growth can be recovered using only the nine longest chronologies, and is not affected by the method used to remove variability related to age or stand dynamics from individual trees. Tree growth is significantly, but weakly, correlated with both temperature (negatively) and precipitation (positively) during summer. Simulated ring-width chronologies produced by a process model of tree-ring growth exhibit similar relationships with summer climate. High and low growth across the region is associated with cool/wet and warm/dry summers, respectively; this relationship is supported by comparisons with archival records from early 19th century fur-trading posts. The tree-ring record indicates that summer droughts were more persistent in the 19th and late 18th century, but there is no evidence that drought was more extreme prior to the onset of direct monitoring. GEOGRAPHIC REGION: Central North America PERIOD OF RECORD: 1783 - 2004 AD FUNDING SOURCES: DESCRIPTION: Leading principal component (PC) of ringwidth records from the Winnipeg River basin, Canada. The PC is derived from 54 ringwidth chronologies from northwestern Ontario, northern Minnesota and southeastern Manitoba. Twenty-six of these chronologies were produced as part of the current study. The 26 ringwidth data files are available from the International Tree Ring Data Bank (ITRDB), filenames cana243-cana268.rwl. DATA: Column 1: Year Column 2: Winnipeg River Basin Regional Ringwidth index Year Ringwidth index 1783 -0.05 1784 0.11 1785 -0.12 1786 -0.08 1787 0.33 1788 -0.2 1789 -0.01 1790 -0.2 1791 -0.23 1792 -0.29 1793 0.23 1794 -0.35 1795 -0.02 1796 0.02 1797 -0.17 1798 -0.18 1799 0.21 1800 -0.12 1801 0.59 1802 0.58 1803 -0.31 1804 -0.97 1805 0.35 1806 -0.02 1807 0.46 1808 0.12 1809 -0.35 1810 0.48 1811 -0.08 1812 0.3 1813 0.19 1814 -0.22 1815 0.28 1816 -0.17 1817 -0.35 1818 -0.01 1819 0.75 1820 -0.54 1821 -0.79 1822 0.56 1823 -0.35 1824 0.25 1825 0.15 1826 -0.21 1827 0.41 1828 0.7 1829 -0.57 1830 -0.36 1831 -0.24 1832 -0.04 1833 0.49 1834 0.76 1835 -0.23 1836 0.08 1837 -0.28 1838 -0.05 1839 -0.64 1840 -0.45 1841 -0.15 1842 0.06 1843 -0.02 1844 -0.06 1845 0.23 1846 0.32 1847 -0.33 1848 0.57 1849 -0.03 1850 0.4 1851 0.18 1852 -0.09 1853 0.04 1854 0.01 1855 0.06 1856 0.71 1857 -0.33 1858 0.24 1859 0.19 1860 -0.17 1861 -0.11 1862 -0.62 1863 -0.5 1864 -0.25 1865 -0.1 1866 -0.06 1867 0.34 1868 -0.16 1869 -0.09 1870 0.4 1871 -0.27 1872 0.57 1873 0.32 1874 -0.47 1875 -0.38 1876 0.08 1877 0.49 1878 -0.01 1879 0.17 1880 -0.29 1881 0.05 1882 -0.13 1883 -0.52 1884 -0.01 1885 0.29 1886 -0.67 1887 0.2 1888 -0.15 1889 -0.18 1890 -0.27 1891 0.21 1892 0.05 1893 -0.44 1894 -0.43 1895 0.58 1896 0.08 1897 0 1898 0.39 1899 0.65 1900 -0.22 1901 0.12 1902 0.17 1903 -0.13 1904 0.26 1905 0.18 1906 -0.51 1907 -0.53 1908 0.09 1909 -0.26 1910 -1.22 1911 0.31 1912 0.12 1913 0.16 1914 -0.09 1915 0.05 1916 0.09 1917 0.21 1918 0.16 1919 -0.51 1920 -0.1 1921 -0.35 1922 0.61 1923 -0.34 1924 -0.06 1925 0.52 1926 0.44 1927 -0.07 1928 0.48 1929 -0.31 1930 0.15 1931 -0.21 1932 0.1 1933 -0.53 1934 -0.26 1935 0.68 1936 -0.66 1937 0.3 1938 0.41 1939 -0.15 1940 -0.3 1941 0.05 1942 0.56 1943 -0.48 1944 0.53 1945 0.13 1946 -0.28 1947 -0.16 1948 -0.49 1949 0.1 1950 0.09 1951 0.16 1952 0.4 1953 0.28 1954 -0.16 1955 0.38 1956 -0.29 1957 0.07 1958 0.13 1959 0.45 1960 -0.22 1961 -0.47 1962 0.71 1963 0.35 1964 -0.02 1965 1 1966 -0.33 1967 0.11 1968 0.02 1969 0.55 1970 -0.51 1971 0.23 1972 -0.11 1973 0.13 1974 -0.46 1975 0.22 1976 -0.28 1977 -0.35 1978 0.14 1979 -0.41 1980 -0.39 1981 0.21 1982 -0.09 1983 -0.24 1984 0.27 1985 0.04 1986 -0.08 1987 -0.13 1988 -0.05 1989 0.23 1990 -0.14 1991 -0.01 1992 -0.24 1993 0.36 1994 -0.08 1995 -0.42 1996 -0.06 1997 -0.02 1998 -0.1 1999 0.58 2000 0.43 2001 0.32 2002 -0.5 2003 -0.26 2004 0.01