# europe_gree003 - Panetolikon-Oro - 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_gree003 - Panetolikon-Oro - Breitenmoser Tree Ring Chronology Data
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# 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: Panetolikon-Oro
#	Location:
#	Country: Greece
#	Northernmost_Latitude: 38.72
#	Southernmost_Latitude: 38.72
#	Easternmost_Longitude: 21.67
#	Westernmost_Longitude: 21.67
#	Elevation: 1350 m
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# Data_Collection
#	Collection_Name: europe_gree003B
#	Earliest_Year: 1858
#	Most_Recent_Year: 1981
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"moisture"}{"T1":"4.52184782126"}{"T2":"13.9002760809"}{"M1":"0.0228203211638"}{"M2":"0.426502738249"}
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# Species
#	Species_Name: Bulgarian fir
#	Species_Code: ABBO
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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
1858	1.041
1859	1.286
1860	1.34
1861	0.998
1862	1.01
1863	0.906
1864	1.013
1865	1.132
1866	1.212
1867	1.072
1868	1.011
1869	0.906
1870	0.92
1871	0.92
1872	0.961
1873	1.051
1874	1.045
1875	0.884
1876	1.31
1877	1.281
1878	0.924
1879	0.773
1880	0.673
1881	0.99
1882	0.858
1883	0.803
1884	1.275
1885	1.544
1886	1.14
1887	0.898
1888	0.962
1889	0.845
1890	0.79
1891	0.748
1892	0.71
1893	0.987
1894	0.925
1895	0.924
1896	0.891
1897	1.01
1898	0.946
1899	1.085
1900	1.06
1901	1.2
1902	1.025
1903	1.104
1904	1.051
1905	1.064
1906	0.973
1907	0.816
1908	0.74
1909	0.913
1910	0.927
1911	1.146
1912	1.363
1913	1.729
1914	1.414
1915	1.079
1916	0.75
1917	1.322
1918	1.022
1919	1.02
1920	1.083
1921	1.091
1922	0.911
1923	0.717
1924	0.787
1925	0.874
1926	0.875
1927	0.759
1928	0.791
1929	0.582
1930	0.79
1931	0.702
1932	0.597
1933	0.776
1934	0.869
1935	0.821
1936	1.072
1937	1.041
1938	1.001
1939	0.887
1940	0.694
1941	0.822
1942	0.972
1943	0.824
1944	0.741
1945	0.927
1946	0.962
1947	1.02
1948	1.239
1949	0.988
1950	1.097
1951	1.094
1952	0.818
1953	1.058
1954	0.784
1955	0.872
1956	0.89
1957	0.922
1958	0.794
1959	1.226
1960	1.176
1961	1.383
1962	1.141
1963	0.826
1964	1.285
1965	1.134
1966	0.979
1967	0.86
1968	0.721
1969	0.628
1970	0.738
1971	0.779
1972	0.784
1973	0.917
1974	0.948
1975	1.371
1976	1.159
1977	1.155
1978	0.975
1979	0.944
1980	0.48
1981	0.884