File:Nao indices comparison.jpg

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Nao_indices_comparison.jpg ‎(172 × 437 pixels, file size: 14 KB, MIME type: image/jpeg)

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The positive and negative phases of the North Atlantic Oscillation are defined by the differences in pressure between the persistent low over Greenland and Iceland and the persistent high off the coast of Portugal. During a positive NAO, both systems are stronger than usual. That is, the low has a lower atmospheric pressure and the high has a higher atmospheric pressure. During the negative phase of the NAO, both systems are weaker, lowering the difference in pressure between them. (Images by Robert Simmon)

http://earthobservatory.nasa.gov/Study/NAO/NAO_2.html

Uploaded by Piotr Flatau

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current16:47, 12 April 2006Thumbnail for version as of 16:47, 12 April 2006172 × 437 (14 KB)Pflatau (talk | contribs)The positive and negative phases of the North Atlantic Oscillation are defined by the differences in pressure between the persistent low over Greenland and Iceland and the persistent high off the coast of Portugal. During a positive NAO, both systems are

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