# europe_fran022 - Llipodere - 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_fran022 - Llipodere - 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: Llipodere
#	Location:
#	Country: France
#	Northernmost_Latitude: 42.45
#	Southernmost_Latitude: 42.45
#	Easternmost_Longitude: 2.38
#	Westernmost_Longitude: 2.38
#	Elevation: 1950 m
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# Data_Collection
#	Collection_Name: europe_fran022B
#	Earliest_Year: 1853
#	Most_Recent_Year: 1977
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.32846019428"}{"T2":"18.4199153353"}{"M1":"0.0218991952994"}{"M2":"0.326300819429"}
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# Species
#	Species_Name: krummholz pine
#	Species_Code: PIMU
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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
1853	0.865
1854	1.332
1855	0.963
1856	0.932
1857	0.981
1858	0.924
1859	0.946
1860	0.876
1861	1.106
1862	0.949
1863	0.972
1864	1.028
1865	0.906
1866	1.052
1867	1.02
1868	0.818
1869	1.034
1870	0.904
1871	1.067
1872	0.921
1873	0.9
1874	0.898
1875	1.038
1876	0.969
1877	1.077
1878	1.173
1879	0.888
1880	0.939
1881	1.059
1882	0.985
1883	1.107
1884	1.228
1885	1.22
1886	1.091
1887	0.997
1888	0.84
1889	1.041
1890	1.015
1891	1.093
1892	1.09
1893	1.126
1894	0.951
1895	0.898
1896	0.77
1897	0.881
1898	0.919
1899	0.93
1900	0.981
1901	1.073
1902	1.144
1903	1.094
1904	1.276
1905	1.231
1906	1.123
1907	0.907
1908	0.871
1909	0.8
1910	0.843
1911	1.054
1912	0.72
1913	0.887
1914	0.921
1915	1.027
1916	1.116
1917	1.033
1918	0.89
1919	0.886
1920	1.13
1921	0.898
1922	0.756
1923	0.939
1924	0.929
1925	0.972
1926	0.87
1927	0.972
1928	1.157
1929	0.971
1930	1.138
1931	0.998
1932	1.125
1933	1.187
1934	0.759
1935	0.867
1936	0.951
1937	1.015
1938	0.842
1939	0.912
1940	0.966
1941	0.781
1942	0.659
1943	0.714
1944	0.768
1945	0.786
1946	0.856
1947	0.868
1948	1.133
1949	1.255
1950	1.085
1951	1.189
1952	1.341
1953	1.241
1954	1.048
1955	1.162
1956	1.262
1957	0.873
1958	0.994
1959	0.911
1960	1.015
1961	1.067
1962	0.745
1963	0.693
1964	1.101
1965	0.872
1966	1.024
1967	0.936
1968	0.905
1969	1.078
1970	1.201
1971	1.109
1972	0.838
1973	1.13
1974	1.021
1975	1.011
1976	1.101
1977	1.02