Image:Winter-NAO-Index.png

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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
Public domain I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide.

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I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. If that release is invalidated for any reason I also grant permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation if I upload the picture after May 12 2007.


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