# europe_brit002 - Bath - 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_brit002 - Bath - 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: Bath
#	Location:
#	Country: United Kingdom
#	Northernmost_Latitude: 51.37
#	Southernmost_Latitude: 51.37
#	Easternmost_Longitude: -2.32
#	Westernmost_Longitude: -2.32
#	Elevation: 45 m
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# Data_Collection
#	Collection_Name: europe_brit002B
#	Earliest_Year: 1879
#	Most_Recent_Year: 1979
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.49182976336"}{"T2":"15.6481140964"}{"M1":"0.0228806344632"}{"M2":"0.560692072411"}
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# Species
#	Species_Name: durmast oak
#	Species_Code: QUPE
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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
1879	1.347
1880	1.037
1881	0.75
1882	0.586
1883	0.794
1884	0.788
1885	0.625
1886	1.067
1887	0.705
1888	0.998
1889	0.841
1890	1.175
1891	0.884
1892	0.992
1893	0.665
1894	0.88
1895	0.619
1896	0.699
1897	1.847
1898	1.387
1899	1.247
1900	1.477
1901	0.956
1902	1.031
1903	1.022
1904	0.967
1905	0.987
1906	1.175
1907	1.119
1908	0.955
1909	1.057
1910	1.199
1911	0.784
1912	0.711
1913	0.597
1914	1.119
1915	1.209
1916	0.98
1917	1.273
1918	0.689
1919	0.452
1920	0.521
1921	0.384
1922	0.544
1923	0.543
1924	0.858
1925	0.728
1926	1.193
1927	1.23
1928	1.063
1929	1.049
1930	0.746
1931	1.348
1932	1.206
1933	0.678
1934	0.494
1935	0.654
1936	0.958
1937	0.822
1938	0.722
1939	1.12
1940	0.892
1941	0.668
1942	0.985
1943	1.153
1944	0.923
1945	1.064
1946	0.954
1947	1.129
1948	0.75
1949	0.796
1950	1.767
1951	1.103
1952	1.134
1953	1.038
1954	1.033
1955	0.97
1956	0.893
1957	0.747
1958	1.279
1959	1.124
1960	1.15
1961	1.003
1962	1.186
1963	1.238
1964	1.253
1965	1.247
1966	1.215
1967	1.025
1968	1.083
1969	0.79
1970	0.922
1971	1.102
1972	0.843
1973	0.979
1974	0.858
1975	0.625
1976	0.614
1977	0.726
1978	1.309
1979	0.97