# northamerica_usa_ak22 - Boulder Creek Alaska Near Haines - 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_ak22 - Boulder Creek Alaska Near Haines - 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: Boulder Creek Alaska Near Haines # Location: # Country: United States # Northernmost_Latitude: 59.35 # Southernmost_Latitude: 59.35 # Easternmost_Longitude: -135.77 # Westernmost_Longitude: -135.77 # Elevation: 45 m #-------------------- # Data_Collection # Collection_Name: northamerica_usa_ak22B # Earliest_Year: 1858 # Most_Recent_Year: 1985 # Time_Unit: y_ad # Core_Length: # Notes: {"sensitivity":"temperature"}{"T1":"4.41428604297"}{"T2":"16.4098933425"}{"M1":"0.0227484616162"}{"M2":"0.422821901536"} #-------------------- # Species # Species_Name: Sitka spruce # Species_Code: PCSI #-------------------- # 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 1858 0.969 1859 1.003 1860 0.946 1861 0.961 1862 0.918 1863 1.048 1864 1.022 1865 1.019 1866 1.052 1867 0.91 1868 1.039 1869 1.091 1870 1.165 1871 1.058 1872 1.141 1873 1.129 1874 1.247 1875 0.997 1876 0.769 1877 0.941 1878 1.014 1879 1.086 1880 1.032 1881 1.013 1882 1.006 1883 1.13 1884 1.154 1885 0.999 1886 1.296 1887 0.882 1888 0.807 1889 0.953 1890 1.125 1891 1.031 1892 0.936 1893 0.927 1894 0.89 1895 0.849 1896 0.798 1897 0.805 1898 0.842 1899 0.897 1900 1.056 1901 0.876 1902 1.01 1903 0.952 1904 0.866 1905 0.985 1906 0.94 1907 1.06 1908 0.999 1909 1.042 1910 1.052 1911 0.996 1912 1.03 1913 1.174 1914 1.143 1915 1.415 1916 1.023 1917 1.071 1918 0.964 1919 0.897 1920 0.956 1921 0.962 1922 0.875 1923 1.014 1924 0.864 1925 0.927 1926 0.96 1927 0.901 1928 0.987 1929 0.942 1930 1.056 1931 0.889 1932 0.879 1933 1.063 1934 1.121 1935 1.172 1936 1.043 1937 0.835 1938 0.878 1939 0.779 1940 0.845 1941 0.864 1942 0.997 1943 0.864 1944 0.881 1945 1.012 1946 1.133 1947 1.074 1948 0.877 1949 0.637 1950 0.936 1951 0.757 1952 0.839 1953 0.627 1954 0.391 1955 0.677 1956 0.917 1957 0.903 1958 0.783 1959 0.961 1960 1.189 1961 1.216 1962 1.265 1963 1.032 1964 1.154 1965 1.249 1966 1.166 1967 1.018 1968 1.001 1969 1.217 1970 1.023 1971 1.145 1972 0.935 1973 1.119 1974 1.111 1975 0.938 1976 1.07 1977 1.013 1978 0.943 1979 1.229 1980 1.055 1981 1.053 1982 1.096 1983 1.123 1984 1.241 1985 1.296