# asia_nepa026 - Kauma Karka - Breitenmoser Tree Ring Chronology Data
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#		World Data Center for Paleoclimatology, Boulder
#				and
#		NOAA Paleoclimatology Program
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# 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_nepa026 - Kauma Karka - Breitenmoser Tree Ring Chronology Data
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# Investigators
#	Investigators:  Breitenmoser, P.; Bronnimann, S.; Frank, D.
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# 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: Kauma Karka
#	Location:
#	Country: Nepal
#	Northernmost_Latitude: 27.38
#	Southernmost_Latitude: 27.38
#	Easternmost_Longitude: 87.13
#	Westernmost_Longitude: 87.13
#	Elevation: 2900 m
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# Data_Collection
#	Collection_Name: asia_nepa026B
#	Earliest_Year: 1878
#	Most_Recent_Year: 1993
#	Time_Unit: y_ad
#	Core_Length:
#	Notes: {"sensitivity":"temperature"}{"T1":"5.82392412839"}{"T2":"20.9856889612"}{"M1":"0.0226138711939"}{"M2":"0.254855359668"}
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# Species
#	Species_Name: silver fir
#	Species_Code: ABSB
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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)
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##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
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age	trsgi
1878	0.48
1879	0.367
1880	0.874
1881	1.183
1882	0.815
1883	1.122
1884	0.963
1885	0.96
1886	0.789
1887	0.705
1888	1.406
1889	1.264
1890	1.296
1891	1.174
1892	0.874
1893	0.948
1894	1.33
1895	1.495
1896	2.009
1897	1.473
1898	1.15
1899	1.024
1900	1.023
1901	0.782
1902	0.788
1903	0.779
1904	0.869
1905	0.809
1906	0.693
1907	0.504
1908	0.264
1909	0.479
1910	0.805
1911	1.613
1912	0.999
1913	0.848
1914	0.969
1915	0.683
1916	1.039
1917	1.277
1918	1.11
1919	0.992
1920	0.817
1921	0.893
1922	1.002
1923	1.054
1924	1.266
1925	1.182
1926	0.71
1927	0.936
1928	1.126
1929	0.81
1930	1.464
1931	1.386
1932	1.187
1933	1.112
1934	1.099
1935	1.159
1936	0.954
1937	0.818
1938	0.589
1939	0.516
1940	0.872
1941	1.343
1942	1.384
1943	1.454
1944	1.49
1945	1.57
1946	0.973
1947	1.131
1948	1.296
1949	1.543
1950	1.331
1951	1.453
1952	1.75
1953	1.495
1954	1.483
1955	1.266
1956	1.086
1957	0.941
1958	1.189
1959	0.809
1960	1.145
1961	1.118
1962	1.006
1963	1.019
1964	0.815
1965	0.543
1966	0.564
1967	0.495
1968	0.577
1969	0.653
1970	0.619
1971	0.747
1972	0.779
1973	0.896
1974	0.814
1975	0.754
1976	1.067
1977	1.206
1978	0.575
1979	0.495
1980	0.729
1981	0.674
1982	0.618
1983	0.528
1984	0.503
1985	0.696
1986	0.801
1987	0.921
1988	0.781
1989	0.794
1990	1.126
1991	1.097
1992	1.046
1993	1.154