# europe_swit141w - Roggwil BE Tanne absterb - 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: europe_swit141w - Roggwil BE Tanne absterb - 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: Roggwil BE Tanne absterb
#	Location:
#	Country: Switzerland
#	Northernmost_Latitude: 47.25
#	Southernmost_Latitude: 47.25
#	Easternmost_Longitude: 7.83
#	Westernmost_Longitude: 7.83
#	Elevation: 535 m
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# Data_Collection
#	Collection_Name: europe_swit141wB
#	Earliest_Year: 1875
#	Most_Recent_Year: 1975
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"4.15134202032"}{"T2":"19.1091724636"}{"M1":"0.0226377022112"}{"M2":"0.398733343782"}
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# Species
#	Species_Name: silver fir
#	Species_Code: ABAL
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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
1875	1.111
1876	1.068
1877	1.181
1878	1.195
1879	1.062
1880	0.896
1881	1.025
1882	0.856
1883	0.933
1884	0.865
1885	0.723
1886	0.626
1887	0.57
1888	0.7
1889	0.83
1890	0.825
1891	0.775
1892	0.678
1893	0.576
1894	0.791
1895	0.657
1896	0.783
1897	0.889
1898	0.949
1899	0.775
1900	0.977
1901	0.907
1902	0.965
1903	1.093
1904	0.974
1905	0.967
1906	1.08
1907	0.919
1908	0.928
1909	0.807
1910	1.173
1911	0.974
1912	1.114
1913	1.36
1914	1.328
1915	1.304
1916	1.376
1917	1.133
1918	1.061
1919	1.173
1920	1.071
1921	0.987
1922	0.785
1923	0.959
1924	0.941
1925	1.255
1926	1.383
1927	1.364
1928	1.286
1929	1.085
1930	1.309
1931	1.359
1932	1.741
1933	1.352
1934	1.152
1935	1.228
1936	1.447
1937	1.361
1938	1.288
1939	1.267
1940	1.22
1941	1.208
1942	1.078
1943	1.28
1944	1.017
1945	1.235
1946	1.23
1947	0.953
1948	0.792
1949	1.025
1950	1.578
1951	1.495
1952	1.306
1953	1.269
1954	1.054
1955	1.213
1956	0.672
1957	0.689
1958	0.383
1959	0.555
1960	0.533
1961	0.865
1962	0.586
1963	0.629
1964	0.615
1965	0.505
1966	0.561
1967	0.4
1968	0.308
1969	0.353
1970	0.295
1971	0.235
1972	0.359
1973	0.312
1974	0.174
1975	0.303