# northamerica_usa_co573w - Wheelman - 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: northamerica_usa_co573w - Wheelman - Breitenmoser Tree Ring Chronology Data
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# Investigators
#	Investigators:  Breitenmoser, P.; Bronnimann, S.; Frank, D.
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# 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: Wheelman
#	Location:
#	Country: United States
#	Northernmost_Latitude: 40.0
#	Southernmost_Latitude: 40.0
#	Easternmost_Longitude: -105.37
#	Westernmost_Longitude: -105.37
#	Elevation: 1950 m
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# Data_Collection
#	Collection_Name: northamerica_usa_co573wB
#	Earliest_Year: 1868
#	Most_Recent_Year: 1982
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"moisture"}{"T1":"4.3649363937"}{"T2":"15.2867319704"}{"M1":"0.0232302950224"}{"M2":"0.511785356382"}
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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
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age	trsgi
1868	0.965
1869	0.828
1870	0.728
1871	1.086
1872	0.952
1873	0.919
1874	0.848
1875	0.726
1876	0.614
1877	1.033
1878	1.247
1879	1.499
1880	0.717
1881	0.859
1882	0.828
1883	0.654
1884	0.723
1885	0.734
1886	0.514
1887	0.143
1888	0.733
1889	0.781
1890	0.949
1891	1.455
1892	1.153
1893	0.736
1894	1.365
1895	1.175
1896	0.605
1897	1.464
1898	1.472
1899	0.813
1900	1.16
1901	1.288
1902	0.662
1903	1.074
1904	1.091
1905	0.782
1906	0.841
1907	1.25
1908	0.838
1909	1.396
1910	0.889
1911	0.751
1912	1.224
1913	1.078
1914	1.352
1915	1.372
1916	1.076
1917	0.873
1918	0.968
1919	0.779
1920	0.871
1921	1.287
1922	0.865
1923	1.61
1924	1.186
1925	0.407
1926	1.415
1927	1.035
1928	1.311
1929	1.07
1930	1.163
1931	0.996
1932	0.62
1933	0.993
1934	0.974
1935	0.532
1936	0.955
1937	1.176
1938	0.886
1939	0.727
1940	0.811
1941	1.287
1942	1.287
1943	1.089
1944	1.11
1945	1.31
1946	0.578
1947	1.325
1948	1.337
1949	1.379
1950	1.022
1951	1.106
1952	1.206
1953	0.917
1954	0.247
1955	0.709
1956	0.778
1957	0.824
1958	0.719
1959	0.873
1960	1.051
1961	1.153
1962	0.788
1963	0.675
1964	0.737
1965	0.638
1966	0.429
1967	1.095
1968	0.916
1969	1.251
1970	1.144
1971	1.472
1972	1.52
1973	1.078
1974	1.104
1975	1.385
1976	1.223
1977	0.609
1978	0.612
1979	0.983
1980	0.679
1981	0.685
1982	0.536