# northamerica_usa_co083 - Niwot Ridge A - 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_co083 - Niwot Ridge A - 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: Niwot Ridge A # Location: # Country: United States # Northernmost_Latitude: 40.07 # Southernmost_Latitude: 40.07 # Easternmost_Longitude: -105.58 # Westernmost_Longitude: -105.58 # Elevation: 3700 m #-------------------- # Data_Collection # Collection_Name: northamerica_usa_co083B # Earliest_Year: 1689 # Most_Recent_Year: 1979 # Time_Unit: y_ad # Core_Length: # Notes: {"sensitivity":"temperature"}{"T1":"4.25159029446"}{"T2":"18.6996545125"}{"M1":"0.0221993745321"}{"M2":"0.323044603986"} #-------------------- # Species # Species_Name: Engelmann spruce # Species_Code: PCEN #-------------------- # 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 1689 1.353 1690 1.313 1691 0.866 1692 0.857 1693 0.883 1694 0.859 1695 0.837 1696 1.001 1697 1.111 1698 0.879 1699 1.057 1700 0.688 1701 0.787 1702 0.853 1703 0.704 1704 0.673 1705 0.879 1706 1.005 1707 1.022 1708 0.998 1709 1.066 1710 1.087 1711 0.981 1712 1.226 1713 1.135 1714 0.936 1715 0.844 1716 0.893 1717 1.418 1718 1.47 1719 1.097 1720 0.995 1721 0.9 1722 0.749 1723 0.714 1724 0.921 1725 1.082 1726 1.065 1727 0.905 1728 1.115 1729 0.875 1730 0.828 1731 0.899 1732 1.003 1733 1.05 1734 1.053 1735 0.896 1736 0.702 1737 0.755 1738 0.913 1739 1.043 1740 0.766 1741 0.759 1742 0.874 1743 0.644 1744 0.798 1745 0.862 1746 0.949 1747 1.025 1748 1.048 1749 1.122 1750 1.298 1751 0.928 1752 0.75 1753 1.011 1754 0.97 1755 1.138 1756 0.849 1757 1.063 1758 0.593 1759 0.865 1760 0.795 1761 0.72 1762 1.19 1763 0.966 1764 0.666 1765 0.882 1766 0.755 1767 1.114 1768 0.832 1769 1.028 1770 0.815 1771 1.015 1772 1.185 1773 1.323 1774 1.419 1775 1.311 1776 1.078 1777 1.044 1778 0.995 1779 0.947 1780 1.307 1781 1.175 1782 1.019 1783 1.238 1784 1.21 1785 1.267 1786 1.265 1787 0.95 1788 0.969 1789 0.76 1790 0.599 1791 0.621 1792 0.826 1793 0.769 1794 0.855 1795 0.927 1796 0.972 1797 1.052 1798 1.385 1799 1.218 1800 1.077 1801 1.207 1802 1.252 1803 1.011 1804 1.105 1805 1.001 1806 1.033 1807 1.272 1808 1.022 1809 0.881 1810 0.792 1811 0.891 1812 1.244 1813 1.078 1814 0.931 1815 1.055 1816 1.055 1817 0.96 1818 0.926 1819 0.895 1820 0.928 1821 0.904 1822 1.106 1823 1.066 1824 1.15 1825 1.078 1826 1.122 1827 1.151 1828 1.179 1829 1.656 1830 1.364 1831 1.184 1832 0.987 1833 1.324 1834 1.098 1835 0.876 1836 0.854 1837 0.963 1838 0.762 1839 0.587 1840 0.591 1841 0.842 1842 0.833 1843 0.782 1844 0.889 1845 0.565 1846 0.717 1847 0.548 1848 0.787 1849 0.758 1850 1.034 1851 0.904 1852 0.795 1853 0.759 1854 0.686 1855 0.834 1856 1.139 1857 0.848 1858 0.877 1859 1.264 1860 1.156 1861 1.181 1862 1.114 1863 1.164 1864 1.094 1865 0.795 1866 0.79 1867 0.809 1868 0.542 1869 0.667 1870 0.527 1871 0.782 1872 0.401 1873 0.798 1874 0.928 1875 0.643 1876 0.826 1877 0.625 1878 0.772 1879 0.73 1880 0.582 1881 0.984 1882 0.512 1883 0.523 1884 0.606 1885 0.734 1886 0.898 1887 0.403 1888 0.388 1889 0.452 1890 0.549 1891 0.722 1892 0.859 1893 0.77 1894 1.041 1895 0.845 1896 0.889 1897 1.213 1898 1.188 1899 0.852 1900 1.123 1901 1.159 1902 0.755 1903 0.828 1904 0.711 1905 0.895 1906 0.69 1907 0.957 1908 1.092 1909 1.115 1910 1.017 1911 0.979 1912 1.024 1913 0.817 1914 0.969 1915 0.857 1916 0.896 1917 0.827 1918 0.87 1919 0.91 1920 0.68 1921 0.748 1922 0.778 1923 0.765 1924 0.906 1925 0.781 1926 0.98 1927 0.972 1928 1.113 1929 1.245 1930 1.111 1931 1.046 1932 1.204 1933 1.184 1934 1.175 1935 1.091 1936 1.177 1937 1.206 1938 1.247 1939 1.447 1940 1.395 1941 1.149 1942 1.093 1943 1.097 1944 1.243 1945 1.197 1946 1.289 1947 1.239 1948 1.221 1949 1.275 1950 1.157 1951 1.315 1952 1.139 1953 1.064 1954 1.104 1955 1.087 1956 1.045 1957 1.044 1958 1.216 1959 1.031 1960 0.981 1961 1.141 1962 0.975 1963 1.232 1964 1.404 1965 1.146 1966 1.376 1967 0.761 1968 0.815 1969 0.996 1970 0.795 1971 0.652 1972 0.883 1973 0.781 1974 0.969 1975 0.964 1976 1.15 1977 1.09 1978 0.964 1979 1.122