# northamerica_usa_wa107 - Mount Adams Low - 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_wa107 - Mount Adams Low - 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: Mount Adams Low
#	Location:
#	Country: United States
#	Northernmost_Latitude: 46.17
#	Southernmost_Latitude: 46.17
#	Easternmost_Longitude: -121.5
#	Westernmost_Longitude: -121.5
#	Elevation: 1495 m
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# Data_Collection
#	Collection_Name: northamerica_usa_wa107B
#	Earliest_Year: 1869
#	Most_Recent_Year: 1992
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.26520330175"}{"T2":"19.1754713576"}{"M1":"0.0222758851008"}{"M2":"0.329626438468"}
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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
1869	1.001
1870	0.884
1871	0.841
1872	1.162
1873	0.802
1874	1.082
1875	0.921
1876	0.793
1877	1.177
1878	1.044
1879	0.937
1880	0.415
1881	1.084
1882	0.982
1883	0.992
1884	0.975
1885	0.963
1886	0.993
1887	0.598
1888	0.999
1889	0.937
1890	0.939
1891	1.058
1892	0.916
1893	0.781
1894	0.807
1895	1.174
1896	0.804
1897	1.149
1898	1.27
1899	0.812
1900	1.544
1901	1.237
1902	1.082
1903	0.885
1904	1.188
1905	1.083
1906	0.951
1907	1.184
1908	1.105
1909	1.079
1910	1.144
1911	1.051
1912	1.007
1913	0.951
1914	1.272
1915	1.115
1916	0.713
1917	1.072
1918	1.067
1919	1.036
1920	1.062
1921	0.939
1922	1.015
1923	1.039
1924	1.09
1925	0.941
1926	1.036
1927	0.918
1928	1.135
1929	0.984
1930	0.956
1931	0.964
1932	0.956
1933	0.976
1934	1.188
1935	1.032
1936	0.916
1937	1.05
1938	1.036
1939	1.035
1940	0.924
1941	1.006
1942	0.916
1943	0.845
1944	1.135
1945	0.996
1946	0.836
1947	1.034
1948	1.099
1949	0.92
1950	1.066
1951	1.018
1952	1.064
1953	0.833
1954	0.805
1955	1.037
1956	0.769
1957	1.179
1958	1.174
1959	0.856
1960	1.048
1961	0.988
1962	0.849
1963	1.01
1964	0.884
1965	1.279
1966	1.079
1967	1.094
1968	0.826
1969	0.894
1970	1.067
1971	0.398
1972	0.718
1973	1.203
1974	0.352
1975	0.847
1976	0.839
1977	1.239
1978	0.76
1979	0.857
1980	0.791
1981	0.832
1982	0.511
1983	0.555
1984	0.982
1985	0.95
1986	1.216
1987	1.325
1988	1.361
1989	1.275
1990	1.757
1991	1.133
1992	1.126