# northamerica_usa_ca568 - Crystal Cave 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
#--------------------
# Contribution_Date
#	Date: 2016-01-07
#--------------------
# Title
#	Study_Name: northamerica_usa_ca568 - Crystal Cave 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: Crystal Cave Sequoia National Park
#	Location:
#	Country: United States
#	Northernmost_Latitude: 36.57
#	Southernmost_Latitude: 36.57
#	Easternmost_Longitude: -118.78
#	Westernmost_Longitude: -118.78
#	Elevation: 1640 m
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# Data_Collection
#	Collection_Name: northamerica_usa_ca568B
#	Earliest_Year: 1880
#	Most_Recent_Year: 1990
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"moisture"}{"T1":"4.45458001615"}{"T2":"15.734740005"}{"M1":"0.0231184583124"}{"M2":"0.455273126118"}
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# Species
#	Species_Name: ponderosa pine
#	Species_Code: PIPO
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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	0.649
1881	0.957
1882	0.71
1883	0.86
1884	1.031
1885	1.325
1886	0.915
1887	0.816
1888	0.929
1889	0.883
1890	0.882
1891	1.046
1892	0.993
1893	1.174
1894	1.229
1895	1.213
1896	1.059
1897	1.153
1898	0.821
1899	0.899
1900	1.111
1901	1.039
1902	1.064
1903	1.176
1904	1.136
1905	1.153
1906	1.235
1907	1.532
1908	1.324
1909	1.409
1910	1.3
1911	1.054
1912	0.925
1913	0.832
1914	0.975
1915	0.914
1916	1.135
1917	0.976
1918	0.841
1919	0.884
1920	0.848
1921	0.888
1922	0.777
1923	1.16
1924	0.566
1925	0.849
1926	0.873
1927	0.906
1928	1.019
1929	0.826
1930	0.807
1931	0.593
1932	0.594
1933	0.53
1934	0.613
1935	0.724
1936	0.946
1937	0.733
1938	1.192
1939	1.048
1940	1.027
1941	1.306
1942	1.328
1943	1.525
1944	1.116
1945	1.241
1946	1.367
1947	1.412
1948	0.89
1949	0.65
1950	0.963
1951	1.028
1952	0.75
1953	1.169
1954	1.273
1955	0.986
1956	1.2
1957	0.983
1958	1.424
1959	0.807
1960	0.634
1961	0.569
1962	0.733
1963	0.574
1964	0.55
1965	0.779
1966	0.851
1967	0.938
1968	1.044
1969	1.186
1970	1.003
1971	0.799
1972	0.835
1973	0.901
1974	1.088
1975	0.787
1976	0.788
1977	0.607
1978	1.025
1979	0.933
1980	1.019
1981	1.22
1982	1.209
1983	1.566
1984	1.595
1985	1.334
1986	1.911
1987	1.057
1988	0.898
1989	0.77
1990	0.673