# northamerica_canada_cana - Canyon Mountain - 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.
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# Online_Resource:
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# Original_Source_URL:
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# Description/Documentation lines begin with #
# Data lines have no #
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# Archive: Tree Rings
#--------------------
# Contribution_Date
#	Date: 2016-01-07
#--------------------
# Title
#	Study_Name: northamerica_canada_cana - Canyon Mountain - 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.
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# Funding_Agency
#	Funding_Agency_Name: Swiss National Science Foundation
#	Grant:
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# Site_Information
#	Site_Name: Canyon Mountain
#	Location:
#	Country: Canada
#	Northernmost_Latitude: 60.67
#	Southernmost_Latitude: 60.67
#	Easternmost_Longitude: -136.9
#	Westernmost_Longitude: -136.9
#	Elevation: 1220 m
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# Data_Collection
#	Collection_Name: northamerica_canada_canaB
#	Earliest_Year: 1840
#	Most_Recent_Year: 1975
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.25244607107"}{"T2":"17.8436606709"}{"M1":"0.0220762211799"}{"M2":"0.30263103666"}
#--------------------
# Species
#	Species_Name: white spruce
#	Species_Code: PCGL
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# Chronology:
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# Variables
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# 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
#
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# Data:
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing Values: nan
#
age	trsgi
1840	1.044
1841	1.038
1842	1.179
1843	1.012
1844	1.224
1845	0.828
1846	0.855
1847	0.751
1848	0.893
1849	0.745
1850	0.839
1851	0.933
1852	1.043
1853	0.744
1854	1.106
1855	1.256
1856	0.983
1857	1.309
1858	1.336
1859	0.978
1860	1.271
1861	1.081
1862	1.188
1863	0.943
1864	0.892
1865	0.976
1866	0.892
1867	0.977
1868	0.885
1869	0.783
1870	0.905
1871	0.921
1872	0.848
1873	0.799
1874	0.877
1875	0.87
1876	1.038
1877	0.896
1878	0.887
1879	0.85
1880	0.755
1881	0.993
1882	1.106
1883	0.796
1884	1.075
1885	0.882
1886	1.057
1887	0.758
1888	1.076
1889	0.614
1890	1.034
1891	0.926
1892	0.993
1893	0.936
1894	1.049
1895	0.782
1896	0.95
1897	0.998
1898	1.071
1899	1.15
1900	0.881
1901	1.067
1902	1.127
1903	1.078
1904	0.582
1905	1.293
1906	0.772
1907	1.084
1908	1.013
1909	0.97
1910	0.937
1911	1.126
1912	0.947
1913	1.084
1914	0.915
1915	1.258
1916	0.862
1917	0.873
1918	1.123
1919	0.71
1920	0.942
1921	1.062
1922	1.225
1923	1.095
1924	0.777
1925	0.913
1926	0.841
1927	1.197
1928	1.115
1929	1.022
1930	1.019
1931	1.017
1932	0.763
1933	0.979
1934	1.034
1935	0.952
1936	1.281
1937	1.032
1938	1.109
1939	1.126
1940	0.988
1941	1.057
1942	1.379
1943	1.239
1944	1.296
1945	1.16
1946	1.445
1947	1.113
1948	1.15
1949	0.836
1950	1.234
1951	1.062
1952	0.825
1953	0.977
1954	0.852
1955	1.038
1956	0.939
1957	1.031
1958	0.937
1959	0.841
1960	0.715
1961	0.873
1962	0.84
1963	0.702
1964	0.968
1965	0.831
1966	1.044
1967	1.167
1968	1.03
1969	1.083
1970	0.686
1971	1.106
1972	0.926
1973	0.724
1974	0.832
1975	1.023