# europe_aust005 - Katscherpass - 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_aust005 - Katscherpass - 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: Katscherpass
#	Location:
#	Country: Austria
#	Northernmost_Latitude: 47.03
#	Southernmost_Latitude: 47.03
#	Easternmost_Longitude: 13.63
#	Westernmost_Longitude: 13.63
#	Elevation: 1800 m
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# Data_Collection
#	Collection_Name: europe_aust005B
#	Earliest_Year: 1869
#	Most_Recent_Year: 1975
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.3812647812"}{"T2":"17.1995335715"}{"M1":"0.0224225787577"}{"M2":"0.395991464932"}
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# Species
#	Species_Name: Norway spruce
#	Species_Code: PCAB
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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
1869	0.806
1870	0.759
1871	0.727
1872	0.802
1873	0.906
1874	1.038
1875	1.103
1876	0.954
1877	0.925
1878	0.942
1879	0.992
1880	1.115
1881	1.276
1882	1.131
1883	1.062
1884	0.972
1885	1.087
1886	0.973
1887	1.052
1888	1.012
1889	1.226
1890	1.04
1891	0.811
1892	1.019
1893	1.067
1894	1.157
1895	1.192
1896	1.011
1897	1.003
1898	0.931
1899	0.821
1900	0.886
1901	0.967
1902	0.888
1903	1.189
1904	1.493
1905	1.092
1906	0.987
1907	1.004
1908	1.018
1909	0.784
1910	0.953
1911	1.078
1912	1.13
1913	0.738
1914	0.994
1915	0.995
1916	1.029
1917	1.38
1918	1.049
1919	1.219
1920	1.168
1921	1.594
1922	1.313
1923	1.242
1924	1.169
1925	1.138
1926	0.963
1927	1.041
1928	1.052
1929	1.015
1930	1.042
1931	1.122
1932	1.01
1933	0.832
1934	0.847
1935	0.897
1936	1.021
1937	0.994
1938	1.078
1939	1.015
1940	1.049
1941	1.096
1942	1.043
1943	1.054
1944	0.927
1945	0.913
1946	0.976
1947	1.0
1948	0.595
1949	0.858
1950	0.915
1951	1.025
1952	0.94
1953	0.927
1954	0.686
1955	0.89
1956	0.901
1957	0.933
1958	1.022
1959	0.857
1960	0.878
1961	0.932
1962	0.866
1963	0.912
1964	0.948
1965	0.837
1966	0.952
1967	1.023
1968	0.872
1969	1.035
1970	0.964
1971	0.921
1972	0.924
1973	0.881
1974	0.65
1975	0.661