# northamerica_usa_ak029 - Water Supply - 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_ak029 - Water Supply - 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: Water Supply # Location: # Country: United States # Northernmost_Latitude: 60.12 # Southernmost_Latitude: 60.12 # Easternmost_Longitude: -149.47 # Westernmost_Longitude: -149.47 # Elevation: 305 m #-------------------- # Data_Collection # Collection_Name: northamerica_usa_ak029B # Earliest_Year: 1795 # Most_Recent_Year: 1989 # Time_Unit: y_ad # Core_Length: # Notes: {"sensitivity":"temperature"}{"T1":"4.29398788771"}{"T2":"17.8170063781"}{"M1":"0.0222261611587"}{"M2":"0.38598807413"} #-------------------- # 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 1795 1.278 1796 1.0 1797 1.58 1798 1.006 1799 0.972 1800 0.78 1801 1.244 1802 0.952 1803 0.739 1804 0.957 1805 1.01 1806 0.975 1807 1.023 1808 1.109 1809 0.784 1810 0.744 1811 0.573 1812 0.704 1813 0.578 1814 0.497 1815 1.174 1816 1.433 1817 1.265 1818 1.432 1819 1.116 1820 0.848 1821 0.834 1822 1.144 1823 0.79 1824 1.377 1825 1.398 1826 1.564 1827 1.041 1828 1.751 1829 1.622 1830 0.788 1831 0.527 1832 0.727 1833 1.106 1834 1.002 1835 1.604 1836 1.191 1837 1.445 1838 1.598 1839 1.673 1840 1.312 1841 1.349 1842 0.79 1843 0.929 1844 1.105 1845 1.247 1846 1.474 1847 1.114 1848 0.576 1849 0.326 1850 0.527 1851 0.613 1852 0.742 1853 0.685 1854 0.597 1855 0.534 1856 0.61 1857 0.595 1858 0.652 1859 0.645 1860 0.707 1861 0.747 1862 0.46 1863 0.609 1864 0.849 1865 1.063 1866 1.279 1867 1.051 1868 1.065 1869 1.106 1870 1.478 1871 1.391 1872 2.195 1873 1.676 1874 1.378 1875 1.368 1876 0.456 1877 0.456 1878 0.972 1879 1.258 1880 0.972 1881 1.293 1882 1.051 1883 1.037 1884 1.505 1885 1.127 1886 0.982 1887 0.624 1888 1.0 1889 1.054 1890 0.748 1891 0.765 1892 1.046 1893 1.046 1894 0.524 1895 0.233 1896 0.263 1897 0.254 1898 0.467 1899 0.495 1900 0.655 1901 0.827 1902 0.859 1903 0.603 1904 0.767 1905 1.114 1906 0.884 1907 0.781 1908 1.119 1909 1.055 1910 1.129 1911 1.289 1912 1.183 1913 1.297 1914 1.137 1915 1.678 1916 1.035 1917 1.343 1918 0.946 1919 1.029 1920 0.943 1921 1.094 1922 1.104 1923 1.392 1924 1.203 1925 1.194 1926 1.485 1927 0.784 1928 0.432 1929 0.365 1930 0.683 1931 1.014 1932 1.173 1933 1.446 1934 1.257 1935 1.361 1936 1.186 1937 0.646 1938 1.056 1939 0.838 1940 0.998 1941 1.588 1942 1.802 1943 1.602 1944 0.884 1945 0.556 1946 0.727 1947 1.302 1948 0.993 1949 1.063 1950 1.058 1951 0.838 1952 0.994 1953 1.065 1954 0.77 1955 0.663 1956 0.506 1957 0.943 1958 0.846 1959 0.996 1960 1.046 1961 1.203 1962 0.939 1963 1.009 1964 0.962 1965 1.007 1966 1.053 1967 0.781 1968 1.229 1969 0.966 1970 0.977 1971 0.776 1972 0.526 1973 0.35 1974 0.701 1975 0.632 1976 0.649 1977 0.822 1978 0.999 1979 1.273 1980 0.735 1981 1.18 1982 1.047 1983 1.104 1984 1.344 1985 1.132 1986 1.172 1987 0.871 1988 1.282 1989 1.059