# northamerica_usa_wa109 - Mount Adams High - Breitenmoser Tree Ring Chronology Data
#-----------------------------------------------------------------------
#		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_wa109 - Mount Adams High - 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 High
#	Location:
#	Country: United States
#	Northernmost_Latitude: 46.17
#	Southernmost_Latitude: 46.17
#	Easternmost_Longitude: -121.5
#	Westernmost_Longitude: -121.5
#	Elevation: 1890 m
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# Data_Collection
#	Collection_Name: northamerica_usa_wa109B
#	Earliest_Year: 1850
#	Most_Recent_Year: 1992
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"6.14084207319"}{"T2":"19.5748195723"}{"M1":"0.0222881060291"}{"M2":"0.321740278692"}
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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
1850	0.789
1851	1.01
1852	0.951
1853	1.02
1854	1.073
1855	1.05
1856	0.935
1857	1.126
1858	1.058
1859	1.101
1860	1.124
1861	0.848
1862	1.051
1863	1.38
1864	1.013
1865	1.123
1866	0.839
1867	0.873
1868	1.059
1869	0.812
1870	0.844
1871	0.953
1872	0.937
1873	0.89
1874	0.888
1875	0.995
1876	0.727
1877	1.041
1878	0.855
1879	0.98
1880	0.709
1881	0.72
1882	0.867
1883	0.831
1884	0.703
1885	1.006
1886	1.01
1887	0.729
1888	1.005
1889	0.968
1890	1.036
1891	1.138
1892	0.953
1893	1.015
1894	0.891
1895	1.312
1896	0.877
1897	0.818
1898	1.122
1899	0.582
1900	0.978
1901	1.017
1902	0.964
1903	0.933
1904	1.238
1905	0.994
1906	0.534
1907	0.913
1908	1.094
1909	0.747
1910	0.818
1911	1.013
1912	0.837
1913	0.922
1914	1.219
1915	0.959
1916	0.534
1917	1.008
1918	0.936
1919	1.002
1920	1.175
1921	0.957
1922	1.129
1923	0.934
1924	1.08
1925	1.079
1926	1.112
1927	1.112
1928	1.15
1929	1.125
1930	1.099
1931	1.027
1932	0.905
1933	0.777
1934	0.883
1935	1.131
1936	0.924
1937	0.764
1938	0.99
1939	1.07
1940	1.149
1941	1.194
1942	1.228
1943	0.986
1944	1.331
1945	1.446
1946	1.156
1947	1.057
1948	1.462
1949	1.265
1950	1.157
1951	0.901
1952	1.079
1953	0.908
1954	0.811
1955	1.271
1956	1.163
1957	1.154
1958	1.296
1959	0.95
1960	1.231
1961	1.057
1962	1.171
1963	1.169
1964	1.226
1965	1.322
1966	1.431
1967	1.414
1968	1.196
1969	1.21
1970	1.161
1971	0.903
1972	1.049
1973	1.383
1974	0.569
1975	1.115
1976	0.747
1977	0.996
1978	0.816
1979	0.984
1980	0.878
1981	0.869
1982	0.568
1983	0.467
1984	0.908
1985	0.691
1986	0.661
1987	0.723
1988	0.647
1989	0.487
1990	0.662
1991	0.339
1992	0.414