# northamerica_usa_ak24 - Brassiere Hill  Taku Inlet  Juneau Area B - 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.
#
#
# Online_Resource:
#
# Original_Source_URL:
#
# Description/Documentation lines begin with #
# Data lines have no #
#
# Archive: Tree Rings
#--------------------
# Contribution_Date
#	Date: 2016-01-07
#--------------------
# Title
#	Study_Name: northamerica_usa_ak24 - Brassiere Hill  Taku Inlet  Juneau Area B - 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.
#--------------------
# Funding_Agency
#	Funding_Agency_Name: Swiss National Science Foundation
#	Grant:
#--------------------
# Site_Information
#	Site_Name: Brassiere Hill  Taku Inlet  Juneau Area B
#	Location:
#	Country: United States
#	Northernmost_Latitude: 58.47
#	Southernmost_Latitude: 58.47
#	Easternmost_Longitude: -134.02
#	Westernmost_Longitude: -134.02
#	Elevation: 30 m
#--------------------
# Data_Collection
#	Collection_Name: northamerica_usa_ak24B
#	Earliest_Year: 1811
#	Most_Recent_Year: 1987
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.14825998048"}{"T2":"13.9888665335"}{"M1":"0.0226651706471"}{"M2":"0.489744964437"}
#--------------------
# Species
#	Species_Name: Sitka spruce
#	Species_Code: PCSI
#--------------------
# Chronology:
#
#
#
#--------------------
# Variables
#
# 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
#
#--------------------
# Data:
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing Values: nan
#
age	trsgi
1811	1.019
1812	1.026
1813	0.983
1814	1.239
1815	1.288
1816	1.199
1817	0.752
1818	0.861
1819	0.844
1820	0.957
1821	1.064
1822	1.106
1823	0.935
1824	0.91
1825	0.772
1826	0.941
1827	0.913
1828	1.072
1829	1.095
1830	1.051
1831	0.932
1832	1.215
1833	0.998
1834	0.864
1835	1.019
1836	0.965
1837	1.026
1838	1.143
1839	1.232
1840	1.143
1841	1.014
1842	1.053
1843	1.189
1844	1.297
1845	1.216
1846	1.145
1847	1.059
1848	1.011
1849	1.11
1850	1.162
1851	1.12
1852	1.17
1853	1.056
1854	0.994
1855	0.804
1856	0.804
1857	1.052
1858	0.974
1859	0.941
1860	0.904
1861	0.917
1862	0.794
1863	0.819
1864	0.87
1865	0.753
1866	0.866
1867	0.947
1868	0.887
1869	0.76
1870	0.969
1871	0.943
1872	1.092
1873	1.029
1874	0.895
1875	0.721
1876	0.414
1877	0.458
1878	0.715
1879	1.262
1880	1.144
1881	0.912
1882	0.741
1883	0.838
1884	0.906
1885	0.755
1886	1.084
1887	0.81
1888	0.881
1889	0.678
1890	0.879
1891	1.028
1892	0.913
1893	0.98
1894	1.028
1895	1.073
1896	1.066
1897	0.915
1898	0.876
1899	1.195
1900	1.06
1901	0.925
1902	1.083
1903	0.893
1904	0.596
1905	0.753
1906	0.825
1907	0.961
1908	0.789
1909	0.741
1910	0.82
1911	0.983
1912	1.22
1913	1.394
1914	1.18
1915	0.877
1916	0.89
1917	1.087
1918	1.156
1919	1.009
1920	1.129
1921	1.146
1922	0.748
1923	1.02
1924	1.028
1925	1.106
1926	1.214
1927	1.235
1928	1.072
1929	1.258
1930	1.084
1931	1.188
1932	1.104
1933	1.172
1934	0.99
1935	0.688
1936	0.677
1937	0.715
1938	0.905
1939	0.982
1940	1.248
1941	1.365
1942	1.408
1943	1.502
1944	1.378
1945	1.216
1946	1.354
1947	1.293
1948	1.284
1949	1.165
1950	1.281
1951	0.875
1952	0.753
1953	0.804
1954	0.49
1955	0.54
1956	0.687
1957	0.854
1958	1.011
1959	1.105
1960	0.938
1961	0.861
1962	1.03
1963	1.316
1964	1.32
1965	1.641
1966	1.439
1967	1.437
1968	1.516
1969	1.1
1970	0.761
1971	0.937
1972	0.846
1973	0.773
1974	0.8
1975	0.913
1976	0.723
1977	0.967
1978	0.727
1979	0.785
1980	0.999
1981	0.976
1982	1.252
1983	1.159
1984	0.911
1985	0.776
1986	1.003
1987	0.229