# northamerica_usa_wa126 - Blue Mountain Medium - Breitenmoser Tree Ring Chronology Data
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#		World Data Center for Paleoclimatology, Boulder
#				and
#		NOAA Paleoclimatology Program
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# 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_usa_wa126 - Blue Mountain Medium - Breitenmoser Tree Ring Chronology Data
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# Investigators
#	Investigators:  Breitenmoser, P.; Bronnimann, S.; Frank, D.
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# 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: Blue Mountain Medium
#	Location:
#	Country: United States
#	Northernmost_Latitude: 47.92
#	Southernmost_Latitude: 47.92
#	Easternmost_Longitude: -123.25
#	Westernmost_Longitude: -123.25
#	Elevation: 1595 m
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# Data_Collection
#	Collection_Name: northamerica_usa_wa126B
#	Earliest_Year: 1869
#	Most_Recent_Year: 1990
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.67268670439"}{"T2":"14.4562547993"}{"M1":"0.0230801462717"}{"M2":"0.5452124748"}
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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
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age	trsgi
1869	0.839
1870	0.97
1871	0.747
1872	0.852
1873	0.914
1874	1.027
1875	1.0
1876	1.024
1877	1.077
1878	1.032
1879	1.014
1880	0.877
1881	0.99
1882	1.013
1883	0.7
1884	0.852
1885	0.776
1886	1.204
1887	1.097
1888	1.127
1889	0.948
1890	1.076
1891	1.029
1892	1.009
1893	1.016
1894	1.048
1895	0.964
1896	0.724
1897	0.949
1898	0.956
1899	0.793
1900	1.096
1901	1.094
1902	1.09
1903	1.133
1904	1.064
1905	1.127
1906	0.962
1907	1.274
1908	1.075
1909	1.141
1910	1.137
1911	1.118
1912	1.317
1913	1.168
1914	1.104
1915	1.176
1916	1.01
1917	0.877
1918	0.954
1919	1.009
1920	1.094
1921	0.91
1922	0.827
1923	0.93
1924	0.792
1925	0.876
1926	0.693
1927	0.75
1928	0.884
1929	0.784
1930	0.761
1931	0.768
1932	0.771
1933	0.816
1934	0.681
1935	0.97
1936	0.881
1937	0.771
1938	0.704
1939	0.88
1940	0.918
1941	1.091
1942	1.111
1943	0.957
1944	1.123
1945	1.028
1946	1.181
1947	1.114
1948	1.39
1949	1.246
1950	1.322
1951	0.984
1952	1.337
1953	0.929
1954	1.174
1955	1.316
1956	1.006
1957	0.948
1958	1.163
1959	0.914
1960	1.037
1961	1.001
1962	0.897
1963	1.018
1964	1.065
1965	1.076
1966	1.122
1967	1.136
1968	0.875
1969	0.983
1970	0.857
1971	0.896
1972	0.925
1973	0.916
1974	0.847
1975	0.786
1976	0.868
1977	0.898
1978	0.89
1979	0.964
1980	0.978
1981	1.143
1982	0.95
1983	0.845
1984	1.151
1985	1.153
1986	0.981
1987	1.016
1988	0.892
1989	0.885
1990	1.046