# northamerica_usa_ak014 - Settlement Point Afognak Island - 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_ak014 - Settlement Point Afognak Island - 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:
#--------------------
# Site_Information
#	Site_Name: Settlement Point Afognak Island
#	Location:
#	Country: United States
#	Northernmost_Latitude: 58.05
#	Southernmost_Latitude: 58.05
#	Easternmost_Longitude: -152.7
#	Westernmost_Longitude: -152.7
#	Elevation: 10 m
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# Data_Collection
#	Collection_Name: northamerica_usa_ak014B
#	Earliest_Year: 1715
#	Most_Recent_Year: 1996
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.65348468796"}{"T2":"17.1232948354"}{"M1":"0.0226448139491"}{"M2":"0.392367394168"}
#--------------------
# Species
#	Species_Name: Sitka spruce
#	Species_Code: PCSI
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# Chronology:
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# 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
1715	0.86
1716	0.686
1717	0.738
1718	0.84
1719	0.798
1720	0.945
1721	1.136
1722	1.218
1723	1.397
1724	1.442
1725	1.267
1726	1.107
1727	1.26
1728	1.368
1729	1.272
1730	0.921
1731	0.987
1732	0.941
1733	1.088
1734	1.066
1735	1.125
1736	1.058
1737	1.473
1738	1.117
1739	1.086
1740	0.6
1741	0.73
1742	0.916
1743	1.069
1744	0.942
1745	1.117
1746	0.93
1747	1.203
1748	1.007
1749	1.112
1750	1.0
1751	0.917
1752	0.882
1753	0.837
1754	0.774
1755	0.895
1756	0.658
1757	0.814
1758	0.753
1759	0.742
1760	0.944
1761	0.83
1762	1.04
1763	0.893
1764	0.985
1765	1.046
1766	0.967
1767	1.04
1768	0.748
1769	0.899
1770	0.83
1771	0.969
1772	1.017
1773	1.099
1774	1.233
1775	0.77
1776	0.959
1777	1.393
1778	1.348
1779	1.334
1780	1.537
1781	0.972
1782	1.343
1783	1.136
1784	1.265
1785	0.954
1786	1.007
1787	0.679
1788	0.868
1789	0.798
1790	1.0
1791	0.938
1792	0.877
1793	0.964
1794	1.234
1795	1.403
1796	1.266
1797	1.41
1798	1.237
1799	1.117
1800	0.994
1801	1.027
1802	1.029
1803	1.113
1804	1.048
1805	1.052
1806	0.816
1807	0.715
1808	0.796
1809	0.545
1810	0.46
1811	0.275
1812	0.391
1813	0.336
1814	0.278
1815	0.409
1816	0.655
1817	0.702
1818	0.661
1819	0.817
1820	0.632
1821	0.67
1822	0.75
1823	0.931
1824	1.04
1825	0.778
1826	0.784
1827	1.098
1828	1.301
1829	1.793
1830	1.364
1831	0.829
1832	0.936
1833	0.771
1834	0.756
1835	1.102
1836	1.164
1837	0.891
1838	1.243
1839	1.433
1840	1.703
1841	1.945
1842	1.027
1843	1.111
1844	1.147
1845	1.193
1846	1.108
1847	0.894
1848	0.808
1849	0.901
1850	0.84
1851	1.101
1852	1.06
1853	0.936
1854	1.14
1855	1.003
1856	1.137
1857	1.372
1858	1.383
1859	1.368
1860	1.077
1861	0.783
1862	0.742
1863	0.815
1864	0.932
1865	1.098
1866	1.076
1867	0.886
1868	0.852
1869	0.769
1870	0.906
1871	0.766
1872	0.91
1873	0.998
1874	1.057
1875	1.128
1876	0.924
1877	0.979
1878	0.849
1879	0.818
1880	0.769
1881	1.064
1882	0.85
1883	0.803
1884	0.949
1885	0.756
1886	0.882
1887	0.752
1888	0.994
1889	0.75
1890	0.916
1891	0.951
1892	0.972
1893	1.26
1894	0.934
1895	0.803
1896	0.883
1897	0.955
1898	0.875
1899	0.875
1900	0.903
1901	0.946
1902	1.217
1903	1.061
1904	0.985
1905	1.262
1906	0.957
1907	0.905
1908	0.897
1909	0.871
1910	0.851
1911	0.979
1912	0.544
1913	0.575
1914	0.602
1915	0.872
1916	0.793
1917	1.131
1918	1.197
1919	1.129
1920	0.913
1921	0.857
1922	0.731
1923	0.893
1924	0.971
1925	0.953
1926	1.018
1927	0.943
1928	1.075
1929	1.014
1930	0.913
1931	1.184
1932	0.88
1933	1.07
1934	1.196
1935	1.286
1936	1.232
1937	0.906
1938	1.03
1939	1.122
1940	0.971
1941	1.134
1942	1.521
1943	1.748
1944	1.793
1945	1.59
1946	1.395
1947	1.485
1948	1.254
1949	1.338
1950	1.123
1951	1.076
1952	1.211
1953	1.154
1954	0.642
1955	0.618
1956	0.723
1957	0.921
1958	0.875
1959	1.091
1960	0.97
1961	1.11
1962	1.049
1963	0.89
1964	0.745
1965	0.667
1966	0.893
1967	0.924
1968	1.042
1969	0.83
1970	0.806
1971	0.792
1972	0.812
1973	0.904
1974	1.168
1975	0.795
1976	0.793
1977	0.855
1978	0.575
1979	0.814
1980	0.792
1981	1.013
1982	0.742
1983	0.802
1984	0.834
1985	0.938
1986	0.969
1987	0.749
1988	0.888
1989	1.079
1990	0.999
1991	1.059
1992	1.234
1993	1.043
1994	0.864
1995	0.821
1996	0.95