# northamerica_usa_wa069 - Hart's Pass N1 - 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_wa069 - Hart's Pass N1 - 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: Hart's Pass N1
#	Location:
#	Country: United States
#	Northernmost_Latitude: 48.7
#	Southernmost_Latitude: 48.7
#	Easternmost_Longitude: -120.65
#	Westernmost_Longitude: -120.65
#	Elevation: 1925 m
#--------------------
# Data_Collection
#	Collection_Name: northamerica_usa_wa069B
#	Earliest_Year: 1724
#	Most_Recent_Year: 1990
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"6.12317291797"}{"T2":"16.5728205102"}{"M1":"0.0227211748953"}{"M2":"0.397030115966"}
#--------------------
# Species
#	Species_Name: subalpine larch
#	Species_Code: LALY
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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
#
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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
1724	1.307
1725	1.106
1726	1.248
1727	1.205
1728	0.969
1729	1.196
1730	1.324
1731	0.957
1732	1.083
1733	1.195
1734	1.451
1735	1.133
1736	1.07
1737	0.934
1738	1.054
1739	1.282
1740	1.112
1741	1.241
1742	1.074
1743	1.11
1744	1.029
1745	1.402
1746	1.027
1747	1.339
1748	1.102
1749	1.025
1750	0.916
1751	1.077
1752	0.686
1753	1.317
1754	1.177
1755	1.152
1756	1.421
1757	1.037
1758	0.985
1759	0.844
1760	0.775
1761	0.967
1762	0.79
1763	0.947
1764	0.963
1765	0.76
1766	0.85
1767	1.0
1768	1.16
1769	0.957
1770	0.86
1771	0.994
1772	0.957
1773	1.057
1774	1.052
1775	0.791
1776	0.883
1777	0.839
1778	0.826
1779	0.83
1780	0.833
1781	0.974
1782	0.978
1783	1.23
1784	0.819
1785	0.742
1786	0.971
1787	0.911
1788	0.961
1789	0.862
1790	1.426
1791	0.937
1792	0.883
1793	0.757
1794	1.252
1795	0.963
1796	1.072
1797	0.894
1798	1.389
1799	0.892
1800	0.844
1801	0.795
1802	1.335
1803	1.239
1804	0.907
1805	0.86
1806	0.657
1807	0.991
1808	0.947
1809	1.033
1810	0.637
1811	0.838
1812	0.982
1813	0.772
1814	0.862
1815	0.772
1816	0.768
1817	1.175
1818	0.754
1819	0.883
1820	0.777
1821	0.624
1822	0.847
1823	0.919
1824	0.377
1825	0.879
1826	0.91
1827	0.837
1828	0.994
1829	1.022
1830	1.161
1831	1.119
1832	0.517
1833	1.022
1834	1.32
1835	0.94
1836	0.763
1837	0.869
1838	0.533
1839	0.956
1840	0.866
1841	1.116
1842	1.137
1843	1.108
1844	0.866
1845	1.11
1846	1.129
1847	1.107
1848	1.261
1849	0.826
1850	1.031
1851	1.249
1852	1.476
1853	0.955
1854	0.722
1855	1.292
1856	0.873
1857	1.064
1858	0.991
1859	1.137
1860	1.025
1861	1.171
1862	1.155
1863	1.407
1864	0.861
1865	1.098
1866	0.976
1867	0.792
1868	0.998
1869	1.049
1870	0.934
1871	1.321
1872	1.551
1873	1.513
1874	1.254
1875	1.199
1876	1.066
1877	0.662
1878	1.149
1879	0.634
1880	0.702
1881	0.775
1882	1.078
1883	0.938
1884	0.847
1885	1.062
1886	1.269
1887	1.211
1888	0.94
1889	1.129
1890	0.807
1891	0.904
1892	1.126
1893	0.721
1894	1.176
1895	1.193
1896	1.167
1897	0.519
1898	0.774
1899	0.962
1900	0.769
1901	0.789
1902	0.635
1903	0.785
1904	0.842
1905	0.616
1906	0.671
1907	0.862
1908	1.005
1909	0.684
1910	0.987
1911	0.993
1912	0.895
1913	0.813
1914	1.171
1915	0.759
1916	0.603
1917	0.996
1918	1.224
1919	1.388
1920	1.468
1921	1.662
1922	1.78
1923	1.153
1924	1.215
1925	1.027
1926	0.932
1927	0.819
1928	1.297
1929	1.121
1930	0.9
1931	0.905
1932	0.95
1933	1.087
1934	1.594
1935	1.247
1936	1.392
1937	1.295
1938	1.493
1939	1.014
1940	1.443
1941	1.063
1942	1.209
1943	1.099
1944	0.951
1945	0.945
1946	0.204
1947	0.78
1948	0.735
1949	0.446
1950	0.544
1951	0.602
1952	0.452
1953	0.567
1954	0.409
1955	0.535
1956	0.248
1957	0.993
1958	0.883
1959	0.477
1960	0.8
1961	1.168
1962	0.639
1963	1.064
1964	0.942
1965	1.082
1966	1.029
1967	1.331
1968	0.86
1969	1.149
1970	1.21
1971	0.776
1972	0.781
1973	0.971
1974	0.89
1975	1.442
1976	1.014
1977	1.365
1978	1.302
1979	0.826
1980	0.881
1981	1.101
1982	0.95
1983	0.767
1984	1.283
1985	1.31
1986	0.963
1987	1.025
1988	0.948
1989	1.059
1990	1.065