# northamerica_canada_cana1 - Montana 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
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# Contribution_Date
#	Date: 2016-01-07
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# Title
#	Study_Name: northamerica_canada_cana1 - Montana 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: Montana Mountain
#	Location:
#	Country: Canada
#	Northernmost_Latitude: 60.1
#	Southernmost_Latitude: 60.1
#	Easternmost_Longitude: -134.68
#	Westernmost_Longitude: -134.68
#	Elevation: 1370 m
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# Data_Collection
#	Collection_Name: northamerica_canada_cana1B
#	Earliest_Year: 1880
#	Most_Recent_Year: 1975
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"4.84736515854"}{"T2":"17.6810288345"}{"M1":"0.0221995911614"}{"M2":"0.346047598633"}
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# Species
#	Species_Name: subalpine fir
#	Species_Code: ABLA
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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)
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##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
1880	0.914
1881	0.916
1882	0.981
1883	0.783
1884	1.284
1885	1.147
1886	1.134
1887	0.741
1888	0.863
1889	0.84
1890	0.983
1891	1.064
1892	1.035
1893	1.225
1894	0.881
1895	0.819
1896	1.009
1897	0.994
1898	0.708
1899	0.852
1900	0.965
1901	0.995
1902	1.064
1903	1.053
1904	0.65
1905	1.025
1906	0.856
1907	0.95
1908	1.022
1909	0.742
1910	0.956
1911	1.122
1912	0.903
1913	1.198
1914	1.152
1915	1.354
1916	1.139
1917	1.08
1918	1.21
1919	0.901
1920	0.822
1921	0.764
1922	0.948
1923	1.154
1924	0.815
1925	0.696
1926	1.094
1927	1.088
1928	0.671
1929	0.817
1930	0.98
1931	0.981
1932	0.846
1933	0.994
1934	1.033
1935	0.971
1936	0.986
1937	0.959
1938	1.214
1939	1.264
1940	1.109
1941	1.222
1942	1.167
1943	1.182
1944	1.401
1945	1.009
1946	1.204
1947	0.991
1948	1.184
1949	0.798
1950	1.149
1951	1.087
1952	0.794
1953	0.963
1954	0.951
1955	1.139
1956	0.794
1957	1.02
1958	0.836
1959	0.659
1960	0.731
1961	0.918
1962	0.86
1963	0.846
1964	0.978
1965	1.075
1966	1.045
1967	0.958
1968	1.07
1969	1.119
1970	0.786
1971	1.101
1972	0.896
1973	0.764
1974	0.906
1975	1.194