Ã¯Â»Â¿# Mount Logan Ice Core Isotope and Accumulation Data
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#               World Data Center for Paleoclimatology, Boulder
#                                  and
#                     NOAA Paleoclimatology Program
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# NOTE: Please cite original reference 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: https://www.ncdc.noaa.gov/cdo/f?p=519:1:::::P1_STUDY_ID:2436
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# Online_Resource: https://www.ncdc.noaa.gov/paleo/study/24611
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# Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/trop/mtlogan/mtlogan.txt
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# Description/Documentation lines begin with #
# Data lines have no #
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# Archive: Ice Cores
# --------------------
# Contribution_date
#	Date: 2002-11
# --------------------
# Title 
#	Study_Name: Mount Logan Ice Core Isotope and Accumulation Data
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# Investigators
#	Investigators: Holdsworth, G.; Krouse, H. R.; Nosa, M. 
# --------------------
# Description_and_Notes
#	Description: 301-year snow accumulation record from from Mount Logan, Yukon, 60 Degrees 36.9' N; 140 Degrees 30.9' W; 5340 m. Accumulation in meters, water equivalent, Estimated error +/- 0.05 m (max)
# Data have been updated from original 1980 core, in 1981, 1986, 1988 and 2000. Note: Year 1988: data not available as the 2001 core penetrated only partly into 1988
# --------------------
# Publication
#	Authors: G. Holdsworth, H.R. Krouse, and M. Nosal
#	Published_Date_or_Year: 1992
#	Published_Title: Ice core climate signals from Mount Logan, Yukon, A. D. 1700Ã¢ÂÂ 1987, in Climate Since AD 1500
#	Journal_Name: Climate Since A.D. 1500
#	Volume: 
#	Edition: 	
#	Issue: 
#	Pages: 483-604
#	DOI: 
#	Online_Resource: 
#	Full_Citation: 
#	Abstract: The relatively short length of most instrumental climate records restricts the study of climate variability, and it is therefore essential to extend the record into the past with the help of proxy data. Only since the late 1940s have atmospheric data been available that are sufficient in quality and spatial resolution to identify the dominant patterns of climate variability, such as the Pacific North America pattern and the Pacific Decadal Oscillation. Here we present a 301-year snow accumulation record from an ice core at a height of 5,340 m above sea level - from Mount Logan, in northwestern North America. This record shows features that are closely linked with the Pacific North America pattern for the period of instrumental data availability. Our record extends back in time to cover the period from the closing stages of the Little Ice Age to the warmest decade in the past millennium. We find a positive, accelerating trend in snow accumulation after the middle of the nineteenth century. This trend is paralleled by a warming over northwestern North America which has been associated with secular changes in both the Pacific North America pattern and the Pacific Decadal Oscillation. 
# --------------------
#	Authors: Anderson, D.M., Tardif, R., Horlick, K., Erb, M.P., Hakim, G.J., Noone, D., Perkins, W.A., and E. Steig
#	Published_Date_or_Year: 2018
#	Published_Title: Additions to the last millennium reanalysis multi-proxy database
#	Journal_Name: Data Science Journal
#	Volume:
#	Edition:
#	Issue:
#	Pages:
#	Report_Number:
#	DOI:
#	Online_Resource:
#	Full_Citation: Anderson, D.M., Tardif, R., Horlick, K., Erb, M.P., Hakim, G., J., Noone, D., Perkins, W.A., and E. Steig, submitted. Additions to the last millennium reanalysis multi-proxy database. Data Science Journal.
#	Abstract: Progress in paleoclimatology increasingly occurs via data syntheses. We describe additions to a collection prepared for use in paleoclimate state estimation, specifically the Last Millennium Reanalysis (LMR).  The 2290 additional series include 2152 tree ring chronologies and 138 other series.  They supplement the collection used previously and together form a database titled LMRdb 1.0.0. The additional data draws from lake core, ice core, coral, speleothem, and tree ring archives, using published data primarily from the NOAA Paleoclimatology archive and a set of tree ring width chronologies standardized from raw International Tree Ring Data Bank ring width series. In contrast to many previous paleo compilations, the data were not selected (screened) on the basis of their environmental correlation, multi-century length, or other attributes. The inclusion of proxies sensitive to moisture and other environmental variables expands their use in data assimilation.  A preliminary calibration using linear regression with mean annual temperature reveals characteristics of the proxy series and their relationship to temperature, as well as the noise and error characteristics of the records. The additional records are structured as individual files in the NOAA Paleoclimatology format and archived at NOAA Paleoclimatology (Anderson et al. 2018) and will continue to be improved and expanded as part of the LMR Project.  The additions represent a four-fold increase in the number of records available for assimilation, provide expanded geographic coverage, and add additional proxy variables.  Applications include data assimilation, proxy system model development, and paleoclimate reconstruction using climate field reconstruction and other methods.
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# Funding_Agency
#	Funding_Agency_Name:International Arctic Research Center, Fairbanks
#	Grant:
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# Funding_Agency
#	Funding_Agency_Name: Geological Survey of Canada
#	Grant:
# --------------------
# Funding_Agency
#	Funding_Agency_Name: National Institute of Polar Research, Tokyo
#	Grant:
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# Funding_Agency
#	Funding_Agency_Name: Natural Sciences and Engineering Research COuncil of Canada
#	Grant:	
# --------------------
#	Funding_Agency_Name: National Science Foundation
#	Grant:AGS-1304263
#	Funding_Agency_Name: National Oceanic and Atmospheric Administration
#	Grant:NA14OAR4310176
#------------------
# Site_Information
#	Site_Name: Mount Logan
#	Location:North America> Canada>Yukon
#	Country: Canada 
#	Northernmost_Latitude: 60.58
#	Southernmost_Latitude: 60.58	 
#	Easternmost_Longitude: -140.58
#	Westernmost_Longitude: -140.58
#	Elevation: 5340 m
# --------------------
# Data_Collection
#	Collection_Name: 92MtLo01
#	Earliest_Year: 1736
#	Most_Recent_Year: 1987
#	Time_Unit: y_ad
#	Notes: {"database":"LMR"} 
#
# --------------------
# 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
##accum	accumulation,,,meters,,Ice Cores,,,N
##d18O	delta 18 oxygen,,,permil SMOW,,Ice Cores,,,N 
#
# --------------------
# Data:
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing values: NAN
#
age	accum	d18O
2000	0.7	NAN
1999	0.73	NAN
1998	0.58	NAN
1997	0.59	NAN
1996	0.56	NAN
1995	0.45	NAN
1994	0.69	NAN
1993	0.54	NAN
1992	0.37	NAN
1991	0.48	NAN
1990	0.6	NAN
1989	0.36	NAN
1988	NAN	NAN
1987	0.51	-33.2
1986	0.76	-31.1
1985	0.49	-30.5
1984	0.41	-33.5
1983	0.32	-30.7
1982	0.33	-31.2
1981	0.68	-25.5
1980	0.39	-31.3
1979	0.38	-32.2
1978	0.4	-31.3
1977	0.21	-34.5
1976	0.39	-34
1975	0.27	-34.8
1974	0.42	-35.8
1973	0.52	-28.2
1972	0.29	-32.9
1971	0.2	-27.9
1970	0.15	-26.3
1969	0.41	-31.5
1968	0.49	-34.6
1967	0.24	-31.6
1966	0.3	-35
1965	0.46	-33.8
1964	0.3	-34.3
1963	0.55	-33
1962	0.43	-36.1
1961	0.57	-32.6
1960	0.53	-31.8
1959	0.45	-35.4
1958	0.69	-33.4
1957	0.37	-35.4
1956	0.32	-31.9
1955	0.38	-28.2
1954	0.47	-33.5
1953	0.38	-34.2
1952	0.42	-29.7
1951	0.3	-28
1950	0.43	-34.5
1949	0.5	-31.2
1948	0.33	-33.9
1947	0.3	-34.6
1946	0.26	-31.8
1945	0.4	-34.5
1944	0.32	-34.1
1943	0.37	-34.3
1942	0.32	-33.1
1941	0.35	-32.6
1940	0.26	-35.9
1939	0.3	-35.2
1938	0.36	-33.5
1937	0.34	-34.5
1936	0.27	-38.2
1935	0.47	-34.9
1934	0.34	-34.2
1933	0.23	-33.6
1932	0.46	-29.1
1931	0.26	-33.5
1930	0.21	-35.5
1929	0.31	-33.4
1928	0.21	-33.5
1927	0.47	-33.4
1926	0.35	-32.6
1925	0.27	-35.8
1924	0.34	-37.6
1923	0.39	-34.5
1922	0.45	-33.6
1921	0.63	-30.6
1920	0.75	-33.4
1919	0.33	-35.4
1918	0.43	-35.6
1917	0.54	-36.3
1916	0.76	-33.3
1915	0.42	-34.9
1914	0.38	-34.5
1913	0.46	-33.4
1912	0.53	-32.8
1911	0.43	-33.8
1910	0.31	-32.1
1909	0.29	-34.8
1908	0.34	-32.6
1907	0.39	-31.3
1906	0.48	-32.3
1905	0.35	-36.1
1904	0.54	-31.6
1903	0.6	-31.9
1902	0.38	-33.1
1901	0.52	-33.8
1900	0.64	-32.7
1899	0.4	-32.8
1898	0.28	-33.5
1897	0.49	-32.9
1896	0.41	-33.1
1895	0.2	-31.5
1894	0.2	-27.7
1893	0.53	-32.2
1892	0.53	-35.3
1891	0.42	-32.1
1890	0.63	-32.5
1889	0.41	-31.7
1888	0.16	-37.5
1887	0.25	-32.6
1886	0.18	-31.2
1885	0.15	-30.9
1884	0.16	-32.3
1883	0.38	-33.2
1882	0.33	-33.5
1881	0.46	-37.5
1880	0.19	-31.6
1879	0.27	-33.5
1878	0.42	-33.1
1877	0.24	-31.6
1876	0.27	-33.4
1875	0.42	-32.4
1874	0.55	-32.4
1873	0.27	-31.5
1872	0.33	-33
1871	0.56	-31.2
1870	0.48	-34.4
1869	0.65	-31.3
1868	0.33	-36.1
1867	0.2	-32.6
1866	0.12	-33.3
1865	0.25	-33.5
1864	0.17	-35.1
1863	0.36	-32.8
1862	0.23	-33.9
1861	0.25	-34.9
1860	0.56	-31
1859	0.51	-30.2
1858	0.4	-28.3
1857	0.59	-32.2
1856	0.56	-32
1855	0.3	-34.7
1854	0.44	-34.3
1853	0.44	-36.9
1852	0.27	-32.8
1851	0.24	-32.3
1850	0.4	-32.7
1849	0.23	-28.4
1848	0.43	-30.7
1847	0.37	-30.7
1846	0.34	-30.5
1845	0.26	-29.9
1844	0.29	-29.8
1843	0.24	-31.8
1842	0.29	-32.1
1841	0.4	-33.5
1840	0.23	-29.8
1839	0.35	-29.4
1838	0.28	-31.1
1837	0.48	-26.8
1836	0.39	-30.6
1835	0.33	-31.2
1834	0.44	-33.4
1833	0.44	-30.3
1832	0.39	-31.5
1831	0.24	-24.8
1830	0.38	-30.7
1829	0.38	-31.4
1828	0.31	-32.8
1827	0.58	-30.4
1826	0.64	-31.5
1825	0.4	-29.6
1824	0.19	-31.3
1823	0.23	-30.9
1822	0.32	-30.4
1821	0.28	-25.8
1820	0.18	-31.7
1819	0.27	-34.3
1818	0.37	-32.8
1817	0.22	-29.7
1816	0.27	-33.2
1815	0.47	-31.7
1814	0.25	-31.6
1813	0.26	-28.9
1812	0.38	-31.8
1811	0.16	-32.4
1810	0.36	-31.6
1809	0.26	-33
1808	0.26	-25.8
1807	0.26	-27.5
1806	0.26	-27.6
1805	0.27	-32.8
1804	0.27	-30.6
1803	0.27	-34.1
1802	0.41	-30.3
1801	0.41	-30.5
1800	0.2	-31.1
1799	0.46	-31.7
1798	0.24	-29.4
1797	0.35	-33.3
1796	0.36	-28.6
1795	0.43	-28.8
1794	0.21	-28.8
1793	0.29	-30.8
1792	0.15	-33.9
1791	0.29	-33.2
1790	0.15	-34.1
1789	0.29	-34.5
1788	0.27	-34.5
1787	0.18	-30.8
1786	0.31	-29.5
1785	0.31	-30.2
1784	0.31	-29.9
1783	0.39	-31.2
1782	0.32	-31.8
1781	0.32	-30.2
1780	0.4	-27.2
1779	0.32	-35.8
1778	0.32	-33.2
1777	0.49	-31.5
1776	0.49	-32.5
1775	0.25	-28.8
1774	0.34	-32.1
1773	0.39	-30.9
1772	0.24	-31.8
1771	0.31	-31.7
1770	0.35	-32.4
1769	0.49	-35.9
1768	0.3	-33.1
1767	0.26	-29.8
1766	0.27	-28.1
1765	0.27	-28.8
1764	0.37	-32.2
1763	0.27	-30
1762	0.27	-30.5
1761	0.18	-32.6
1760	0.29	-32.1
1759	0.19	-32.1
1758	0.26	-30.7
1757	0.21	-30.7
1756	0.23	-32.1
1755	0.34	-31.2
1754	0.28	-32.2
1753	0.22	-34.2
1752	0.24	-33.5
1751	0.2	-32.3
1750	0.4	-28.6
1749	0.3	-27.5
1748	0.31	-24.6
1747	0.41	-28.9
1746	0.21	-29.9
1745	0.21	-30.3
1744	0.3	-34
1743	0.33	-33.3
1742	0.21	-28.8
1741	0.38	-28.4
1740	0.28	-31.8
1739	0.42	-31.9
1738	0.44	-32.4
1737	0.34	-32.3
1736	0.57	-28.2