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- Description: North Atlantic Oscillation (NAO) index. Year is on the x-axis (1900–2005), and the standardised principal-component based winter NAO index on the y-axis. The bars show each winter's mean NAO index (where for instance "winter 1900" means the period from December 1899 up to and including March 1900). The black line is the 5-year running mean of the same index values (smoothed with a Gaussian filter).
- Source: graph drawn by Hanno using data published on the web by J.W. Hurrell (Climate Analysis Section, National Centre for Atmospheric Research, Boulder, Colorado, USA) as "Climate indices" [ http://www.cgd.ucar.edu/cas/jhurrell/indices.html]
- Licence: released into the public domain by the originator
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse
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