# northamerica_usa_wa104 - Mount Adams Low - 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_wa104 - Mount Adams Low - 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: Mount Adams Low
#	Location:
#	Country: United States
#	Northernmost_Latitude: 46.17
#	Southernmost_Latitude: 46.17
#	Easternmost_Longitude: -121.5
#	Westernmost_Longitude: -121.5
#	Elevation: 1495 m
#--------------------
# Data_Collection
#	Collection_Name: northamerica_usa_wa104B
#	Earliest_Year: 1718
#	Most_Recent_Year: 1992
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.16876513648"}{"T2":"20.5542797853"}{"M1":"0.0227017867385"}{"M2":"0.319869360793"}
#--------------------
# Species
#	Species_Name: mountain hemlock
#	Species_Code: TSME
#--------------------
# 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
1718	1.387
1719	1.163
1720	1.193
1721	0.934
1722	1.027
1723	1.206
1724	1.155
1725	1.219
1726	1.39
1727	1.302
1728	1.169
1729	1.498
1730	1.144
1731	1.223
1732	0.893
1733	0.962
1734	0.944
1735	1.012
1736	1.305
1737	0.982
1738	1.16
1739	1.241
1740	1.298
1741	1.824
1742	0.959
1743	1.448
1744	0.987
1745	0.943
1746	0.829
1747	1.114
1748	0.718
1749	0.725
1750	0.57
1751	0.563
1752	0.409
1753	0.361
1754	0.553
1755	0.419
1756	1.122
1757	0.703
1758	0.69
1759	0.726
1760	0.508
1761	0.437
1762	0.744
1763	0.6
1764	0.753
1765	0.553
1766	0.535
1767	0.47
1768	0.731
1769	0.804
1770	1.044
1771	0.978
1772	0.907
1773	0.878
1774	0.979
1775	0.48
1776	1.118
1777	1.101
1778	1.148
1779	1.012
1780	0.993
1781	0.666
1782	0.944
1783	1.161
1784	0.894
1785	0.655
1786	0.908
1787	0.672
1788	1.226
1789	1.048
1790	0.911
1791	1.248
1792	1.371
1793	1.09
1794	1.194
1795	1.119
1796	1.026
1797	0.629
1798	1.096
1799	1.043
1800	1.048
1801	0.855
1802	1.052
1803	0.997
1804	1.017
1805	1.111
1806	0.694
1807	0.87
1808	0.377
1809	0.813
1810	0.377
1811	0.882
1812	1.096
1813	0.934
1814	0.918
1815	0.777
1816	1.068
1817	1.137
1818	0.865
1819	0.712
1820	0.51
1821	0.951
1822	1.135
1823	1.0
1824	0.854
1825	1.046
1826	1.072
1827	1.068
1828	1.114
1829	1.123
1830	1.041
1831	1.168
1832	0.986
1833	1.256
1834	1.146
1835	1.026
1836	0.81
1837	0.988
1838	1.019
1839	1.362
1840	1.03
1841	0.938
1842	1.226
1843	1.35
1844	1.215
1845	1.523
1846	1.286
1847	1.212
1848	1.185
1849	0.686
1850	1.003
1851	1.329
1852	1.092
1853	1.122
1854	0.909
1855	1.034
1856	0.821
1857	1.185
1858	1.179
1859	1.119
1860	1.157
1861	1.239
1862	1.107
1863	1.508
1864	1.147
1865	0.987
1866	0.76
1867	0.893
1868	0.821
1869	0.81
1870	0.747
1871	0.863
1872	0.98
1873	0.938
1874	1.052
1875	0.901
1876	0.659
1877	0.797
1878	0.976
1879	0.947
1880	0.371
1881	0.79
1882	1.073
1883	1.031
1884	0.832
1885	1.097
1886	1.164
1887	0.798
1888	1.441
1889	1.392
1890	1.187
1891	1.33
1892	1.143
1893	1.025
1894	0.782
1895	1.517
1896	1.011
1897	1.339
1898	1.509
1899	0.586
1900	1.189
1901	1.157
1902	1.166
1903	1.035
1904	1.516
1905	1.4
1906	1.095
1907	0.977
1908	0.867
1909	0.824
1910	1.11
1911	1.158
1912	1.067
1913	0.92
1914	1.528
1915	1.107
1916	0.092
1917	0.931
1918	1.223
1919	1.092
1920	1.197
1921	0.574
1922	0.86
1923	0.851
1924	1.02
1925	0.838
1926	1.01
1927	0.697
1928	1.039
1929	1.122
1930	0.999
1931	0.913
1932	0.564
1933	0.504
1934	0.808
1935	1.001
1936	1.101
1937	1.199
1938	1.307
1939	1.27
1940	1.125
1941	1.172
1942	0.918
1943	0.857
1944	1.358
1945	1.232
1946	0.814
1947	1.095
1948	1.002
1949	0.938
1950	1.18
1951	1.378
1952	1.567
1953	0.968
1954	0.494
1955	0.799
1956	0.651
1957	1.203
1958	1.665
1959	1.353
1960	1.439
1961	1.219
1962	0.95
1963	0.91
1964	0.719
1965	0.989
1966	1.15
1967	1.01
1968	0.953
1969	0.744
1970	0.981
1971	0.509
1972	0.904
1973	1.472
1974	0.295
1975	0.989
1976	0.881
1977	1.125
1978	0.781
1979	0.826
1980	0.699
1981	0.726
1982	0.516
1983	0.637
1984	0.725
1985	0.879
1986	0.827
1987	1.117
1988	0.956
1989	0.786
1990	0.888
1991	0.228
1992	0.535