# northamerica_usa_ca565 - Colony Mill Sequoia National Park - Breitenmoser Tree Ring Chronology Data
#-----------------------------------------------------------------------
#		World Data Center for Paleoclimatology, Boulder
#				and
#		NOAA Paleoclimatology Program
#-----------------------------------------------------------------------
# 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
#--------------------
# Title
#	Study_Name: northamerica_usa_ca565 - Colony Mill Sequoia National Park - 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: Colony Mill Sequoia National Park
#	Location:
#	Country: United States
#	Northernmost_Latitude: 36.57
#	Southernmost_Latitude: 36.57
#	Easternmost_Longitude: -118.8
#	Westernmost_Longitude: -118.8
#	Elevation: 1644 m
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# Data_Collection
#	Collection_Name: northamerica_usa_ca565B
#	Earliest_Year: 1880
#	Most_Recent_Year: 1990
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"moisture"}{"T1":"6.08847465411"}{"T2":"15.8246691193"}{"M1":"0.0231408000593"}{"M2":"0.540696800456"}
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# Species
#	Species_Name: California black oak
#	Species_Code: QUKE
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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
1880	0.864
1881	0.925
1882	1.054
1883	1.058
1884	1.049
1885	0.979
1886	0.953
1887	0.871
1888	1.052
1889	0.889
1890	1.038
1891	1.023
1892	1.039
1893	1.009
1894	1.05
1895	1.013
1896	1.122
1897	1.142
1898	0.965
1899	0.756
1900	0.794
1901	0.968
1902	0.94
1903	1.03
1904	1.02
1905	0.893
1906	1.093
1907	1.005
1908	0.76
1909	0.91
1910	0.977
1911	1.063
1912	1.121
1913	1.103
1914	1.02
1915	1.088
1916	0.744
1917	1.023
1918	0.942
1919	1.048
1920	0.97
1921	1.035
1922	1.175
1923	1.083
1924	0.671
1925	0.953
1926	0.921
1927	1.171
1928	1.015
1929	0.963
1930	0.872
1931	0.882
1932	1.118
1933	1.083
1934	0.729
1935	1.064
1936	1.109
1937	1.515
1938	1.43
1939	1.072
1940	1.043
1941	1.299
1942	1.079
1943	0.973
1944	1.003
1945	1.069
1946	0.852
1947	0.796
1948	0.821
1949	0.8
1950	0.722
1951	0.91
1952	1.179
1953	0.98
1954	0.893
1955	1.039
1956	1.058
1957	0.979
1958	1.125
1959	0.664
1960	0.72
1961	0.567
1962	0.861
1963	0.864
1964	0.852
1965	0.927
1966	0.857
1967	1.262
1968	0.952
1969	1.465
1970	1.043
1971	1.186
1972	0.733
1973	1.427
1974	1.129
1975	1.125
1976	0.875
1977	0.707
1978	1.202
1979	1.278
1980	1.059
1981	0.887
1982	1.361
1983	1.055
1984	0.664
1985	0.69
1986	0.807
1987	0.789
1988	0.676
1989	0.873
1990	0.868