# northamerica_usa_or067 - Mount Jefferson Low - Breitenmoser Tree Ring Chronology Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # 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: # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Tree Rings #-------------------- # Contribution_Date # Date: 2016-01-07 #-------------------- # Title # Study_Name: northamerica_usa_or067 - Mount Jefferson Low - Breitenmoser Tree Ring Chronology Data #-------------------- # Investigators # Investigators: Breitenmoser, P.; Bronnimann, S.; Frank, D. #-------------------- # Description_and_Notes # Description: Data from Breitenmoser 2014 Journal of past Climate supplementary, see publication for ARSTAN standardization details #-------------------- # Publication # Authors: Breitenmoser, P.; Bronnimann, S.; Frank, D. # Published_Date_or_Year: 2014-03-11 # Published_Title: Forward modelling of tree-ring width and comparison with a global network of tree-ring chronologies # Journal_Name: Climate of the Past # Volume: 10 # Edition: # Issue: # Pages: 437-449 # DOI: 10.5194/cp-10-437-2014 # Online_Resource: www.clim-past.net/10/437/2014/ # Full_Citation: # Abstract: We investigate relationships between climate and tree-ring data on a global scale using the process-based Vaganov–Shashkin Lite (VSL) forward model of tree-ring width formation. The VSL model requires as inputs only latitude, monthly mean temperature, and monthly accumulated precipitation. Hence, this simple, process-based model enables ring-width simulation at any location where monthly climate records exist. In this study, we analyse the growth response of simulated tree rings to monthly climate conditions obtained from the CRU TS3.1 data set back to 1901. Our key aims are (a) to assess the VSL model performance by examining the relations between simulated and observed growth at 2287 globally distributed sites, (b) indentify optimal growth parameters found during the model calibration, and (c) to evaluate the potential of the VSL model as an observation operator for data-assimilation-based reconstructions of climate from tree-ring width. The assessment of the growth-onset threshold temperature of approximately 4–6 C for most sites and species using a Bayesian estimation approach complements other studies on the lower temperature limits where plant growth may be sustained. Our results suggest that the VSL model skilfully simulates site level treering series in response to climate forcing for a wide range of environmental conditions and species. Spatial aggregation of the tree-ring chronologies to reduce non-climatic noise at the site level yielded notable improvements in the coherence between modelled and actual growth. The resulting distinct and coherent patterns of significant relationships between the aggregated and simulated series further demonstrate the VSL model’s ability to skilfully capture the climatic signal contained in tree-ring series. Finally, we propose that the VSL model can be used as an observation operator in data assimilation approaches to reconstruct past climate. #-------------------- # Funding_Agency # Funding_Agency_Name: Swiss National Science Foundation # Grant: #-------------------- # Site_Information # Site_Name: Mount Jefferson Low # Location: # Country: United States # Northernmost_Latitude: 44.67 # Southernmost_Latitude: 44.67 # Easternmost_Longitude: -121.83 # Westernmost_Longitude: -121.83 # Elevation: 1585 m #-------------------- # Data_Collection # Collection_Name: northamerica_usa_or067B # Earliest_Year: 1734 # Most_Recent_Year: 1993 # Time_Unit: y_ad # Core_Length: # Notes: {"sensitivity":"temperature"}{"T1":"3.7596598037"}{"T2":"16.7845443287"}{"M1":"0.0225133857166"}{"M2":"0.330724663011"} #-------------------- # Species # Species_Name: mountain hemlock # Species_Code: TSME #-------------------- # Chronology: # # # #-------------------- # Variables # # Data variables follow that 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 age, , ,years AD, , , , ,N ##trsgi tree ring standardized growth index, tree ring, ,percent relative to mean growth, , Tree Rings, , ,N # #-------------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: nan # age trsgi 1734 0.928 1735 1.044 1736 1.001 1737 1.299 1738 1.067 1739 1.172 1740 1.05 1741 0.82 1742 0.653 1743 0.836 1744 0.837 1745 0.87 1746 0.991 1747 1.005 1748 0.968 1749 0.982 1750 1.097 1751 1.117 1752 0.907 1753 0.776 1754 0.614 1755 1.056 1756 1.02 1757 0.899 1758 0.981 1759 0.809 1760 0.927 1761 0.979 1762 1.055 1763 1.011 1764 0.861 1765 1.0 1766 0.873 1767 0.959 1768 0.98 1769 0.931 1770 1.106 1771 1.117 1772 1.015 1773 1.106 1774 1.068 1775 0.87 1776 0.957 1777 1.131 1778 1.191 1779 1.201 1780 1.169 1781 0.762 1782 0.968 1783 0.837 1784 1.078 1785 0.964 1786 1.055 1787 0.891 1788 1.306 1789 1.186 1790 0.87 1791 0.979 1792 1.033 1793 1.043 1794 1.118 1795 1.047 1796 0.921 1797 1.011 1798 1.277 1799 1.177 1800 1.293 1801 0.756 1802 0.965 1803 0.904 1804 1.011 1805 1.115 1806 1.01 1807 1.011 1808 0.852 1809 1.106 1810 0.847 1811 1.074 1812 1.009 1813 0.854 1814 1.063 1815 0.863 1816 1.11 1817 1.043 1818 1.008 1819 0.993 1820 0.88 1821 0.96 1822 1.126 1823 0.737 1824 0.67 1825 0.917 1826 0.973 1827 0.775 1828 0.961 1829 1.105 1830 0.938 1831 0.919 1832 0.67 1833 1.198 1834 1.286 1835 1.095 1836 0.939 1837 0.986 1838 1.045 1839 1.233 1840 0.881 1841 1.024 1842 1.013 1843 1.318 1844 1.246 1845 1.14 1846 1.113 1847 0.931 1848 1.196 1849 0.844 1850 0.965 1851 1.047 1852 0.922 1853 1.061 1854 1.011 1855 0.938 1856 0.921 1857 1.259 1858 1.318 1859 1.235 1860 1.39 1861 1.018 1862 0.974 1863 1.141 1864 0.873 1865 0.87 1866 0.767 1867 0.975 1868 1.029 1869 0.885 1870 0.739 1871 0.646 1872 0.976 1873 1.124 1874 1.006 1875 1.049 1876 0.61 1877 0.687 1878 0.838 1879 1.081 1880 0.78 1881 0.968 1882 1.12 1883 1.132 1884 0.854 1885 0.986 1886 1.381 1887 1.179 1888 1.165 1889 1.023 1890 0.936 1891 0.864 1892 0.904 1893 0.918 1894 0.894 1895 1.197 1896 0.782 1897 1.014 1898 1.026 1899 0.782 1900 1.05 1901 1.101 1902 0.98 1903 0.897 1904 1.296 1905 1.348 1906 1.172 1907 1.086 1908 1.033 1909 0.933 1910 1.057 1911 1.06 1912 1.035 1913 1.241 1914 1.455 1915 0.999 1916 0.813 1917 0.943 1918 0.718 1919 0.817 1920 0.815 1921 0.904 1922 1.028 1923 0.981 1924 0.889 1925 0.799 1926 0.996 1927 0.894 1928 0.874 1929 0.977 1930 0.882 1931 0.789 1932 0.905 1933 0.885 1934 0.935 1935 1.151 1936 1.156 1937 0.885 1938 1.093 1939 1.251 1940 0.963 1941 1.322 1942 1.207 1943 1.139 1944 0.955 1945 0.827 1946 0.997 1947 0.894 1948 0.971 1949 1.197 1950 1.219 1951 1.238 1952 1.033 1953 0.608 1954 1.015 1955 1.106 1956 1.369 1957 1.086 1958 1.052 1959 0.962 1960 0.835 1961 0.726 1962 0.814 1963 0.735 1964 0.902 1965 0.924 1966 1.28 1967 1.11 1968 0.837 1969 0.864 1970 1.044 1971 1.085 1972 1.118 1973 1.001 1974 0.917 1975 1.052 1976 0.868 1977 0.868 1978 0.86 1979 1.088 1980 1.05 1981 0.743 1982 0.938 1983 0.703 1984 1.087 1985 1.044 1986 0.843 1987 0.882 1988 0.859 1989 0.41 1990 0.804 1991 0.342 1992 0.725 1993 0.603