# northamerica_usa_ca562 - Little Baldy 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_ca562 - Little Baldy 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: Little Baldy Sequoia National Park
#	Location:
#	Country: United States
#	Northernmost_Latitude: 36.62
#	Southernmost_Latitude: 36.62
#	Easternmost_Longitude: -118.8
#	Westernmost_Longitude: -118.8
#	Elevation: 2394 m
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# Data_Collection
#	Collection_Name: northamerica_usa_ca562B
#	Earliest_Year: 1880
#	Most_Recent_Year: 1990
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"moisture"}{"T1":"4.24587869595"}{"T2":"16.1872960075"}{"M1":"0.0215193622068"}{"M2":"0.417501280437"}
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# Species
#	Species_Name: Jeffrey pine
#	Species_Code: PIJE
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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	0.791
1881	0.996
1882	0.939
1883	0.882
1884	0.988
1885	1.403
1886	1.022
1887	0.892
1888	1.007
1889	0.941
1890	0.815
1891	0.96
1892	0.954
1893	0.951
1894	1.039
1895	1.043
1896	0.913
1897	1.039
1898	1.053
1899	0.854
1900	1.111
1901	1.308
1902	1.09
1903	0.922
1904	0.972
1905	1.036
1906	1.085
1907	1.23
1908	1.381
1909	1.219
1910	0.884
1911	0.816
1912	0.896
1913	1.24
1914	1.182
1915	0.81
1916	0.917
1917	0.785
1918	0.821
1919	0.917
1920	0.934
1921	1.034
1922	0.826
1923	0.904
1924	0.936
1925	0.986
1926	1.146
1927	0.745
1928	0.887
1929	0.772
1930	0.815
1931	1.185
1932	0.901
1933	0.666
1934	1.226
1935	0.958
1936	1.06
1937	0.856
1938	1.046
1939	1.23
1940	1.122
1941	0.994
1942	1.128
1943	1.182
1944	0.839
1945	1.064
1946	1.168
1947	1.203
1948	0.781
1949	0.818
1950	1.039
1951	1.075
1952	0.719
1953	0.944
1954	1.213
1955	0.833
1956	0.83
1957	0.997
1958	1.455
1959	0.983
1960	0.673
1961	0.716
1962	0.836
1963	0.893
1964	1.053
1965	1.046
1966	1.13
1967	0.931
1968	0.912
1969	0.919
1970	0.804
1971	0.731
1972	0.846
1973	1.095
1974	0.924
1975	0.717
1976	0.945
1977	1.168
1978	0.944
1979	1.064
1980	0.869
1981	1.086
1982	1.09
1983	1.398
1984	1.177
1985	0.782
1986	1.244
1987	1.169
1988	1.014
1989	0.971
1990	1.306