# northamerica_usa_tn018 - Hen Wallow Falls - 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_tn018 - Hen Wallow Falls - 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: Hen Wallow Falls
#	Location:
#	Country: United States
#	Northernmost_Latitude: 35.75
#	Southernmost_Latitude: 35.75
#	Easternmost_Longitude: -83.23
#	Westernmost_Longitude: -83.23
#	Elevation: 233 m
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# Data_Collection
#	Collection_Name: northamerica_usa_tn018B
#	Earliest_Year: 1799
#	Most_Recent_Year: 1995
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"2.43370092732"}{"T2":"18.8417097471"}{"M1":"0.0222496139022"}{"M2":"0.347648666306"}
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# Species
#	Species_Name: eastern hemlock
#	Species_Code: TSCA
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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
1799	1.155
1800	1.033
1801	1.34
1802	1.274
1803	1.097
1804	1.417
1805	1.116
1806	1.095
1807	0.869
1808	1.12
1809	0.856
1810	1.062
1811	0.965
1812	0.765
1813	0.565
1814	0.592
1815	0.423
1816	1.08
1817	0.889
1818	0.923
1819	0.963
1820	0.723
1821	0.826
1822	0.787
1823	0.858
1824	0.853
1825	1.122
1826	0.82
1827	0.899
1828	1.27
1829	1.156
1830	0.864
1831	0.641
1832	0.582
1833	0.726
1834	0.73
1835	0.698
1836	0.664
1837	0.754
1838	0.756
1839	0.683
1840	0.882
1841	1.212
1842	0.988
1843	0.758
1844	0.759
1845	0.814
1846	0.845
1847	0.864
1848	0.807
1849	0.804
1850	0.747
1851	0.799
1852	0.654
1853	0.802
1854	1.133
1855	0.68
1856	0.895
1857	1.329
1858	1.201
1859	1.048
1860	0.813
1861	0.728
1862	0.656
1863	0.708
1864	0.888
1865	0.716
1866	0.757
1867	1.028
1868	0.91
1869	0.883
1870	0.835
1871	0.644
1872	0.569
1873	0.519
1874	0.798
1875	0.605
1876	0.832
1877	0.72
1878	0.857
1879	0.787
1880	1.145
1881	0.884
1882	1.011
1883	0.924
1884	0.752
1885	0.671
1886	0.484
1887	0.445
1888	0.552
1889	0.845
1890	1.012
1891	1.058
1892	1.129
1893	1.075
1894	1.181
1895	1.06
1896	1.069
1897	0.927
1898	0.896
1899	0.862
1900	1.247
1901	1.38
1902	1.415
1903	1.418
1904	1.467
1905	1.233
1906	1.262
1907	0.961
1908	0.948
1909	1.322
1910	1.396
1911	1.41
1912	0.811
1913	1.133
1914	0.943
1915	0.817
1916	0.994
1917	1.231
1918	1.061
1919	1.349
1920	1.082
1921	1.191
1922	1.311
1923	1.355
1924	1.009
1925	0.636
1926	0.511
1927	0.811
1928	1.269
1929	1.509
1930	1.1
1931	1.472
1932	1.611
1933	1.414
1934	1.359
1935	1.595
1936	1.159
1937	1.126
1938	1.499
1939	1.334
1940	1.041
1941	1.044
1942	0.912
1943	1.262
1944	0.991
1945	1.107
1946	1.211
1947	1.116
1948	1.111
1949	1.101
1950	1.152
1951	1.085
1952	0.989
1953	1.029
1954	0.816
1955	0.609
1956	0.811
1957	0.909
1958	0.973
1959	0.914
1960	0.698
1961	0.893
1962	1.26
1963	0.598
1964	0.983
1965	0.709
1966	0.863
1967	0.51
1968	0.819
1969	0.792
1970	0.93
1971	1.011
1972	0.783
1973	0.949
1974	0.822
1975	0.898
1976	0.746
1977	0.727
1978	0.744
1979	0.756
1980	0.833
1981	0.604
1982	0.921
1983	1.148
1984	0.725
1985	0.924
1986	0.651
1987	0.809
1988	0.846
1989	0.736
1990	0.93
1991	0.859
1992	0.972
1993	0.988
1994	0.642
1995	0.907