# europe_swit132 - Les Arbepins VS - Breitenmoser Tree Ring Chronology Data
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#		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: europe_swit132 - Les Arbepins VS - 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: Les Arbepins VS
#	Location:
#	Country: Switzerland
#	Northernmost_Latitude: 46.13
#	Southernmost_Latitude: 46.13
#	Easternmost_Longitude: 7.17
#	Westernmost_Longitude: 7.17
#	Elevation: 840 m
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# Data_Collection
#	Collection_Name: europe_swit132B
#	Earliest_Year: 1856
#	Most_Recent_Year: 1979
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.49744553557"}{"T2":"17.1494357738"}{"M1":"0.0224619670093"}{"M2":"0.400645508863"}
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# Species
#	Species_Name: Scots pine
#	Species_Code: PISY
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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
1856	1.164
1857	0.856
1858	0.535
1859	0.826
1860	1.019
1861	1.331
1862	1.048
1863	0.663
1864	0.998
1865	0.887
1866	1.242
1867	1.149
1868	0.975
1869	0.983
1870	0.607
1871	0.914
1872	1.115
1873	1.042
1874	0.692
1875	1.125
1876	1.119
1877	1.28
1878	1.309
1879	1.106
1880	0.694
1881	1.019
1882	1.053
1883	1.109
1884	0.836
1885	0.824
1886	0.871
1887	0.833
1888	0.757
1889	0.739
1890	0.808
1891	0.865
1892	0.873
1893	0.622
1894	0.41
1895	0.738
1896	0.935
1897	1.208
1898	1.027
1899	0.991
1900	0.975
1901	0.879
1902	1.129
1903	0.788
1904	1.211
1905	1.178
1906	1.159
1907	0.948
1908	0.759
1909	0.664
1910	0.95
1911	0.941
1912	1.16
1913	1.146
1914	1.575
1915	1.33
1916	1.441
1917	1.315
1918	1.141
1919	1.096
1920	0.755
1921	0.135
1922	0.665
1923	0.843
1924	0.968
1925	0.517
1926	1.078
1927	0.98
1928	0.99
1929	1.117
1930	1.011
1931	0.878
1932	1.075
1933	0.643
1934	0.504
1935	0.783
1936	1.024
1937	1.332
1938	1.373
1939	1.678
1940	2.032
1941	2.026
1942	1.283
1943	1.569
1944	0.797
1945	1.032
1946	1.047
1947	0.908
1948	0.908
1949	0.867
1950	0.963
1951	1.15
1952	1.033
1953	1.112
1954	1.116
1955	1.085
1956	1.029
1957	1.151
1958	1.3
1959	1.087
1960	0.987
1961	0.822
1962	0.713
1963	0.958
1964	0.702
1965	0.934
1966	0.944
1967	0.992
1968	0.695
1969	0.889
1970	0.901
1971	0.744
1972	0.435
1973	0.636
1974	0.411
1975	0.479
1976	0.16
1977	0.427
1978	0.497
1979	0.755