Citation:

s00382-018-4506-7

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Abstract:

A winter (DJFM) North Atlantic Oscillation index (NAOi) has been reconstructed over the peridod 1781-1996 by calibrating the winter frequencies of Lamb weather types to the winter PC-based NAOi of Hurrell (1995, doi:10.1126/science.269.5224.676).

The data file contains 4 columns: year of JFM, NAOi, uncertainty (1 std), number of unclassified days over this winter.

The NAOi has no unit since regressed to a normalised index. Note that this index has not been renormalised (to an average value of zero and standard deviation of 1).

The number of unclassified days directly affects the reliability and consistency of the NAOi. For instance, Delaygue et al. (2018) require less than 24 unclassified days per winter to consider the NAOi.

Coverage:

Date/Time Start: 1781-01-01T00:00:00 * Date/Time End: 1996-12-31T00:00:00

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	DATE/TIME	Date/Time		Delaygue, Gilles	Geocode
2	North Atlantic Ocean Index	NAOi		Delaygue, Gilles
3	Uncertainty	Uncertainty	±	Delaygue, Gilles	1 sigma
4	Days, cumulated	Days cum	day	Delaygue, Gilles	number of unclassified days

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

642 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Date/Time	2 NAOi	3 Uncertainty [±]	4 Days cum [day]
1781	-0.40	0.2	13
1782	-0.93	0.2	14
1783	-0.38	0.3	14
1784	-1.38	0.2	36
1785	-1.57	0.3	10
1786	-1.17	0.2	9
1787	-0.70	0.2	93
1789	-0.45	0.2	36
1790	1.40	0.2	2
1791	0.91	0.3	10
1792	-0.56	0.2	19
1793	0.13	0.1	93
1794	0.64	0.2	33
1795	-1.09	0.2	30
1796	0.27	0.2	3
1797	0.66	0.2	2
1798	0.65	0.3	8
1799	-0.27	0.1	93
1800	-0.98	0.2	46
1801	-0.05	0.2	5
1802	-0.51	0.2	19
1803	-0.80	0.2	32
1804	-0.68	0.3	3
1805	-0.49	0.3	5
1806	-0.32	0.3	17
1807	-0.52	0.3	5
1808	0.07	0.3	3
1809	-0.52	0.2	10
1810	0.09	0.2	13
1811	-0.02	0.1	92
1813	1.01	0.2	34
1814	-1.21	0.2	2
1815	0.36	0.2	20
1816	0.22	0.2	10
1817	1.16	0.3	9
1818	0.21	0.2	8
1819	0.30	0.3	1
1820	-0.31	0.3	6
1821	0.07	0.2	7
1822	1.24	0.2	11
1823	-1.05	0.2	8
1824	-0.15	0.3	4
1825	0.60	0.2	11
1826	-0.58	0.2	4
1827	-0.88	0.3	9
1828	0.30	0.2	17
1829	-0.95	0.2	10
1830	-0.36	0.3	3
1831	-0.56	0.2	7
1832	-0.27	0.3	10
1833	-0.13	0.2	37
1834	1.42	0.3	11
1835	0.64	0.2	5
1836	0.36	0.3	3
1837	-0.38	0.3	1
1838	-1.28	0.2	2
1839	0.63	0.3	7
1840	-0.49	0.3	2
1841	-1.38	0.2	31
1842	-0.13	0.3	2
1843	0.03	0.2	5
1844	-0.01	0.3	6
1845	-1.50	0.3	3
1846	0.59	0.3	6
1847	-1.11	0.3	10
1848	-0.70	0.2	6
1849	0.83	0.2	3
1850	-0.13	0.2	5
1851	0.26	0.3	1
1852	-0.38	0.3	1
1853	-1.19	0.3	1
1854	-0.21	0.2	1
1855	-0.97	0.3	4
1856	-1.18	0.3	5
1857	-0.28	0.2	1
1858	0.39	0.2	5
1859	0.99	0.3	1
1860	-1.10	0.3	3
1861	-0.78	0.2	3
1862	-1.05	0.3	1
1863	0.34	0.3	4
1864	-0.50	0.3	2
1865	-1.44	0.3	8
1866	0.13	0.3	4
1867	-0.61	0.2	18
1868	0.53	0.3	3
1869	-0.22	0.3	3
1870	-1.41	0.3	0
1871	-0.86	0.2	2
1872	-0.37	0.2	1
1873	-1.21	0.3	1
1874	0.93	0.2	2
1875	-0.89	0.3	3
1876	-0.33	0.3	1
1877	-0.51	0.2	1
1878	0.30	0.3	0
1879	-1.30	0.3	0
1880	0.47	0.2	3
1881	-0.97	0.3	1
1882	1.52	0.2	1
1883	-0.63	0.2	0
1884	0.63	0.3	0
1885	-0.69	0.2	2
1886	-0.59	0.2	0
1887	0.18	0.2	1
1888	-0.67	0.3	0
1889	0.02	0.2	0
1890	0.56	0.3	2
1891	-0.53	0.3	0
1892	-0.46	0.3	1
1893	0.33	0.3	0
1894	0.81	0.3	0
1895	-1.30	0.3	0
1896	0.69	0.2	1
1897	-0.48	0.3	1
1898	0.21	0.3	1
1899	0.58	0.2	0
	-1.34	0.2	0
1901	-0.26	0.3	0
1902	-0.20	0.2	0
1903	1.11	0.2	1
1904	-0.92	0.2	0
1905	0.67	0.2	1
1906	0.47	0.2	0
1907	0.31	0.2	0
1908	0.14	0.2	0
1909	-0.55	0.2	1
1910	0.12	0.3	1
1911	0.41	0.2	0
1912	0.08	0.2	1
1913	1.03	0.2	0
1914	0.61	0.2	1
1915	-1.04	0.3	0
1916	-0.32	0.2	0
1917	-1.56	0.2	2
1918	0.50	0.2	0
1919	-0.62	0.3	0
1920	1.03	0.2	1
1921	0.74	0.2	0
1922	0.29	0.2	0
1923	0.31	0.2	1
1924	-0.94	0.2	1
1925	0.62	0.2	0
1926	0.24	0.2	2
1927	0.23	0.2	1
1928	-0.17	0.2	1
1929	0.12	0.2	0
1930	-0.35	0.2	0
1931	-0.62	0.2	0
1932	0.27	0.2	0
1933	-0.06	0.2	1
1934	0.10	0.2	0
1935	0.12	0.2	3
1936	-1.45	0.2	0
1937	-0.39	0.2	1
1938	0.49	0.2	1
1939	-0.56	0.2	0
1940	-1.17	0.2	1
1941	-1.21	0.2	3
1942	-0.48	0.2	5
1943	0.74	0.2	1
1944	0.26	0.3	0
1945	0.52	0.2	2
1946	-0.02	0.2	0
1947	-1.38	0.2	1
1948	-0.05	0.2	0
1949	1.20	0.2	0
1950	0.71	0.2	0
1951	-1.49	0.2	0
1952	0.02	0.2	0
1953	0.30	0.2	1
1954	-0.53	0.2	0
1955	-1.22	0.2	0
1956	0.01	0.2	0
1957	0.72	0.2	0
1958	0.00	0.3	0
1959	0.11	0.2	2
1960	-0.92	0.2	1
1961	0.76	0.3	2
1962	-0.22	0.3	1
1963	-0.89	0.2	0
1964	0.01	0.2	0
1965	-0.27	0.2	5
1966	-0.09	0.2	1
1967	1.02	0.2	4
1968	-0.28	0.3	2
1969	-1.06	0.2	2
1970	-0.95	0.2	1
1971	0.38	0.2	2
1972	-0.33	0.2	1
1973	0.79	0.2	1
1974	-0.22	0.2	1
1975	0.65	0.2	0
1976	0.54	0.2	3
1977	-0.67	0.2	2
1978	-0.24	0.2	2
1979	-0.99	0.2	2
1980	-0.12	0.2	0
1981	0.16	0.3	3
1982	-0.40	0.2	0
1983	0.68	0.2	6
1984	-0.24	0.2	5
1985	-0.29	0.2	0
1986	-0.36	0.2	0
1987	-0.51	0.3	4
1988	-0.47	0.3	0
1989	1.84	0.2	2
1990	0.99	0.2	0
1991	-0.34	0.2	0
1992	1.36	0.2	1
1993	0.99	0.2	0
1994	0.58	0.2	0
1995	0.47	0.3	0
1996	-1.62	0.2	0