# northamerica_usa_ca575 - Gin Flat Yosemite 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
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# Title
#	Study_Name: northamerica_usa_ca575 - Gin Flat Yosemite 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: Gin Flat Yosemite National Park
#	Location:
#	Country: United States
#	Northernmost_Latitude: 37.77
#	Southernmost_Latitude: 37.77
#	Easternmost_Longitude: -119.77
#	Westernmost_Longitude: -119.77
#	Elevation: 2180 m
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# Data_Collection
#	Collection_Name: northamerica_usa_ca575B
#	Earliest_Year: 1880
#	Most_Recent_Year: 1990
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"4.82667666597"}{"T2":"15.9036893756"}{"M1":"0.0220678634499"}{"M2":"0.36661491383"}
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# Species
#	Species_Name: sugar pine
#	Species_Code: PILA
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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)
#
##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	0.814
1881	1.039
1882	0.85
1883	0.891
1884	0.92
1885	1.144
1886	0.971
1887	1.028
1888	1.027
1889	1.03
1890	0.952
1891	1.067
1892	0.942
1893	0.867
1894	0.934
1895	1.03
1896	0.914
1897	1.168
1898	1.013
1899	0.9
1900	1.082
1901	1.173
1902	0.991
1903	1.007
1904	0.95
1905	1.041
1906	1.047
1907	1.091
1908	1.14
1909	1.058
1910	1.029
1911	1.099
1912	1.029
1913	1.101
1914	1.175
1915	1.114
1916	1.105
1917	0.966
1918	0.852
1919	0.853
1920	0.785
1921	0.866
1922	0.739
1923	1.037
1924	0.834
1925	0.911
1926	1.045
1927	0.991
1928	1.12
1929	0.948
1930	0.921
1931	1.054
1932	0.793
1933	0.678
1934	1.07
1935	0.923
1936	0.98
1937	0.84
1938	0.943
1939	1.145
1940	1.026
1941	0.949
1942	0.998
1943	1.237
1944	1.059
1945	1.102
1946	1.234
1947	1.274
1948	1.083
1949	1.067
1950	1.235
1951	1.221
1952	0.867
1953	1.054
1954	1.208
1955	0.897
1956	0.895
1957	1.166
1958	1.305
1959	1.138
1960	1.088
1961	0.872
1962	0.876
1963	1.058
1964	1.067
1965	0.954
1966	1.064
1967	1.022
1968	0.913
1969	0.888
1970	0.74
1971	0.735
1972	0.844
1973	0.831
1974	0.882
1975	0.917
1976	0.835
1977	0.666
1978	0.843
1979	0.716
1980	0.942
1981	0.847
1982	1.15
1983	1.007
1984	1.072
1985	1.068
1986	1.262
1987	0.95
1988	1.052
1989	1.028
1990	1.287