# europe_ital016 - Monte Mattone - 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_ital016 - Monte Mattone - 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: Monte Mattone
#	Location:
#	Country: Italy
#	Northernmost_Latitude: 41.78
#	Southernmost_Latitude: 41.78
#	Easternmost_Longitude: 14.03
#	Westernmost_Longitude: 14.03
#	Elevation: 1550 m
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# Data_Collection
#	Collection_Name: europe_ital016B
#	Earliest_Year: 1860
#	Most_Recent_Year: 1980
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"3.64740685157"}{"T2":"13.3473607183"}{"M1":"0.0224657043623"}{"M2":"0.353297086618"}
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# Species
#	Species_Name: Austrian pine
#	Species_Code: PINI
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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
1860	0.847
1861	0.816
1862	0.869
1863	0.933
1864	0.833
1865	0.795
1866	0.914
1867	0.998
1868	1.145
1869	1.166
1870	1.135
1871	1.292
1872	1.265
1873	1.321
1874	1.157
1875	1.041
1876	1.354
1877	1.278
1878	1.058
1879	0.678
1880	0.802
1881	0.857
1882	1.121
1883	1.048
1884	1.22
1885	1.344
1886	1.122
1887	1.014
1888	0.889
1889	0.84
1890	0.966
1891	1.095
1892	1.153
1893	1.345
1894	1.129
1895	0.872
1896	0.838
1897	1.416
1898	1.018
1899	0.964
1900	0.826
1901	1.067
1902	1.077
1903	1.026
1904	0.86
1905	0.87
1906	0.936
1907	0.925
1908	0.967
1909	1.043
1910	1.063
1911	0.955
1912	1.16
1913	1.074
1914	1.224
1915	1.071
1916	0.828
1917	0.774
1918	0.556
1919	0.598
1920	0.86
1921	0.691
1922	0.512
1923	0.789
1924	0.835
1925	0.803
1926	0.899
1927	1.042
1928	0.767
1929	0.609
1930	1.036
1931	0.802
1932	0.827
1933	0.873
1934	0.895
1935	1.124
1936	1.279
1937	0.969
1938	0.942
1939	1.08
1940	0.999
1941	1.061
1942	0.96
1943	0.936
1944	0.744
1945	0.67
1946	0.786
1947	0.859
1948	0.961
1949	1.379
1950	1.194
1951	0.773
1952	0.949
1953	1.342
1954	1.042
1955	0.951
1956	1.009
1957	0.761
1958	0.657
1959	1.066
1960	1.303
1961	1.241
1962	0.873
1963	0.765
1964	0.935
1965	1.029
1966	1.088
1967	0.997
1968	0.939
1969	1.115
1970	1.18
1971	1.062
1972	0.95
1973	0.978
1974	0.94
1975	0.929
1976	0.877
1977	1.426
1978	1.163
1979	1.136
1980	0.962