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 Center for Atmospheric Research, Boulder, Colorado, USA) as "Climate indices" [http://www.cgd.ucar.edu/cas/jhurrell/indices.html]
  • Licence: released per the GNU Free Documentation License by the photographer


I, the author of this work, hereby publish it under the following license:
GNU head Permission is granted 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; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

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