# asia_russ137w - Ust Ulagan Lake (Altai) - 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
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# Contribution_Date
#	Date: 2016-01-07
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# Title
#	Study_Name: asia_russ137w - Ust Ulagan Lake (Altai) - 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: Ust Ulagan Lake (Altai)
#	Location:
#	Country: Russia
#	Northernmost_Latitude: 50.48
#	Southernmost_Latitude: 50.48
#	Easternmost_Longitude: 87.65
#	Westernmost_Longitude: 87.65
#	Elevation: 2150 m
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# Data_Collection
#	Collection_Name: asia_russ137wB
#	Earliest_Year: 1783
#	Most_Recent_Year: 1994
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"6.1574115148"}{"T2":"18.8078127429"}{"M1":"0.0222685999833"}{"M2":"0.338593703836"}
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# Species
#	Species_Name: Siberian larch
#	Species_Code: LASI
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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)
#
##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
1783	1.531
1784	0.8
1785	0.587
1786	0.846
1787	0.385
1788	0.122
1789	0.361
1790	0.414
1791	0.669
1792	0.733
1793	0.751
1794	0.784
1795	0.64
1796	0.582
1797	0.394
1798	0.698
1799	0.623
1800	0.647
1801	0.839
1802	0.879
1803	1.128
1804	1.086
1805	1.153
1806	1.27
1807	1.021
1808	0.996
1809	0.948
1810	1.086
1811	1.163
1812	1.07
1813	0.548
1814	0.459
1815	0.815
1816	0.719
1817	0.638
1818	0.764
1819	0.645
1820	0.597
1821	0.722
1822	0.653
1823	0.733
1824	0.955
1825	0.774
1826	0.677
1827	0.786
1828	0.869
1829	0.977
1830	1.231
1831	1.028
1832	0.977
1833	0.667
1834	0.599
1835	0.465
1836	0.74
1837	0.879
1838	0.985
1839	1.026
1840	0.686
1841	1.009
1842	0.587
1843	0.779
1844	0.919
1845	0.999
1846	1.253
1847	0.898
1848	1.306
1849	1.124
1850	0.552
1851	0.935
1852	0.73
1853	0.91
1854	0.479
1855	0.862
1856	0.881
1857	1.167
1858	0.759
1859	0.712
1860	0.939
1861	0.917
1862	1.007
1863	1.017
1864	1.246
1865	1.077
1866	1.117
1867	0.898
1868	0.988
1869	0.798
1870	1.003
1871	0.714
1872	0.637
1873	0.797
1874	0.662
1875	0.3
1876	0.447
1877	0.815
1878	0.79
1879	1.191
1880	1.149
1881	1.315
1882	1.127
1883	1.2
1884	0.632
1885	0.958
1886	0.681
1887	0.618
1888	0.892
1889	1.141
1890	0.941
1891	1.068
1892	1.244
1893	0.988
1894	1.218
1895	1.182
1896	1.184
1897	1.345
1898	1.215
1899	1.027
1900	1.079
1901	1.119
1902	1.148
1903	0.977
1904	1.41
1905	1.338
1906	0.887
1907	0.766
1908	1.315
1909	1.621
1910	1.242
1911	0.523
1912	0.668
1913	0.618
1914	0.534
1915	0.883
1916	0.888
1917	0.702
1918	0.926
1919	0.871
1920	1.355
1921	1.315
1922	1.092
1923	1.046
1924	1.4
1925	1.225
1926	1.454
1927	0.683
1928	1.561
1929	1.528
1930	1.66
1931	1.328
1932	1.142
1933	1.202
1934	0.943
1935	0.97
1936	0.976
1937	0.817
1938	0.666
1939	1.092
1940	1.108
1941	1.235
1942	1.29
1943	1.104
1944	1.444
1945	1.551
1946	1.848
1947	1.212
1948	1.759
1949	1.461
1950	1.785
1951	1.594
1952	1.045
1953	1.246
1954	1.09
1955	1.275
1956	0.986
1957	1.326
1958	0.441
1959	1.131
1960	0.823
1961	0.296
1962	0.986
1963	1.252
1964	1.206
1965	1.125
1966	1.24
1967	0.832
1968	1.208
1969	1.131
1970	0.646
1971	0.723
1972	0.771
1973	0.786
1974	1.139
1975	0.947
1976	0.847
1977	1.083
1978	1.067
1979	1.216
1980	0.964
1981	1.13
1982	0.974
1983	0.659
1984	0.813
1985	0.398
1986	0.475
1987	0.489
1988	0.535
1989	0.723
1990	0.894
1991	1.049
1992	1.143
1993	0.816
1994	1.332