Coupling between Greenland blocking and the North Atlantic Oscillation pattern
Through the adoption of a bidimensional blocking index based on geopotential height, it is shown that the blocking frequency over Greenland is not only a key element in describing the North Atlantic Oscillation (NAO) index, but it also operates as an essential element in modulating its pattern. When...
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Language: | English |
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-357 https://doi.org/10.1029/2012GL052315 |
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ftncar:oai:drupal-site.org:articles_12288 2023-09-05T13:19:42+02:00 Coupling between Greenland blocking and the North Atlantic Oscillation pattern Davini, P. (author) Cagnazzo, C. (author) Neale, Richard (author) Tribbia, Joseph (author) 2012-07-21 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-357 https://doi.org/10.1029/2012GL052315 en eng Geophysical Research Letters http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-357 doi:10.1029/2012GL052315 ark:/85065/d78k79v2 Copyright 2012 American Geophysical Union. Text article 2012 ftncar https://doi.org/10.1029/2012GL052315 2023-08-14T18:39:30Z Through the adoption of a bidimensional blocking index based on geopotential height, it is shown that the blocking frequency over Greenland is not only a key element in describing the North Atlantic Oscillation (NAO) index, but it also operates as an essential element in modulating its pattern. When Greenland blocking is lower than average, the first Empirical Orthogonal Function (EOF) of the 500 hPa geopotential height over the Euro-Atlantic region no longer resembles the NAO. Moreover, the typical trimodal variability observed in the Atlantic eddy-driven jet stream is reduced to a bimodal variability. Consistent with this result, we link the eastward displacement of the NAO pattern observed in recent years to the decreasing frequency of Greenland Blocking. Considering the large bias seen in the simulated blocking frequency in climate models, such strong coupling might have important consequences in the analysis of the NAO in climate simulations. Article in Journal/Newspaper Greenland North Atlantic North Atlantic oscillation OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Greenland Geophysical Research Letters 39 14 n/a n/a |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Through the adoption of a bidimensional blocking index based on geopotential height, it is shown that the blocking frequency over Greenland is not only a key element in describing the North Atlantic Oscillation (NAO) index, but it also operates as an essential element in modulating its pattern. When Greenland blocking is lower than average, the first Empirical Orthogonal Function (EOF) of the 500 hPa geopotential height over the Euro-Atlantic region no longer resembles the NAO. Moreover, the typical trimodal variability observed in the Atlantic eddy-driven jet stream is reduced to a bimodal variability. Consistent with this result, we link the eastward displacement of the NAO pattern observed in recent years to the decreasing frequency of Greenland Blocking. Considering the large bias seen in the simulated blocking frequency in climate models, such strong coupling might have important consequences in the analysis of the NAO in climate simulations. |
author2 |
Davini, P. (author) Cagnazzo, C. (author) Neale, Richard (author) Tribbia, Joseph (author) |
format |
Article in Journal/Newspaper |
title |
Coupling between Greenland blocking and the North Atlantic Oscillation pattern |
spellingShingle |
Coupling between Greenland blocking and the North Atlantic Oscillation pattern |
title_short |
Coupling between Greenland blocking and the North Atlantic Oscillation pattern |
title_full |
Coupling between Greenland blocking and the North Atlantic Oscillation pattern |
title_fullStr |
Coupling between Greenland blocking and the North Atlantic Oscillation pattern |
title_full_unstemmed |
Coupling between Greenland blocking and the North Atlantic Oscillation pattern |
title_sort |
coupling between greenland blocking and the north atlantic oscillation pattern |
publishDate |
2012 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-357 https://doi.org/10.1029/2012GL052315 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic North Atlantic oscillation |
genre_facet |
Greenland North Atlantic North Atlantic oscillation |
op_relation |
Geophysical Research Letters http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-357 doi:10.1029/2012GL052315 ark:/85065/d78k79v2 |
op_rights |
Copyright 2012 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2012GL052315 |
container_title |
Geophysical Research Letters |
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39 |
container_issue |
14 |
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n/a |
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n/a |
_version_ |
1776200531855802368 |