Atmospheric blocking: space-time links to the NAO and PNA
In the Northern hemisphere, regions characterized by an enhanced frequency of atmospheric blocking overlap significantly with those associated with the major extra-tropical patterns of large-scale climate variability—namely the North Atlantic Oscillation (NAO) and the Pacific North American (PNA) pa...
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ftreroch:oai:doc.rero.ch:321240 2023-05-15T17:28:01+02:00 Atmospheric blocking: space-time links to the NAO and PNA Croci-Maspoli, Mischa Schwierz, Cornelia Davies, Huw 2018-06-18T17:58:33Z http://doc.rero.ch/record/321240/files/382_2007_Article_259.pdf eng eng http://doc.rero.ch/record/321240/files/382_2007_Article_259.pdf 2018 ftreroch 2023-02-16T17:32:34Z In the Northern hemisphere, regions characterized by an enhanced frequency of atmospheric blocking overlap significantly with those associated with the major extra-tropical patterns of large-scale climate variability—namely the North Atlantic Oscillation (NAO) and the Pacific North American (PNA) pattern. There is likewise an overlap in the temporal band-width of blocks and these climate patterns. Here the nature of the linkage between blocks and the climate patterns is explored by using the ERA-40 re-analysis data set to examine (1) their temporal and spatial correlation and (2) the interrelationship between blocks and the NAO/PNA. It is shown that a strong anti-correlation exists between blocking occurrence and the phase of the NAO (PNA) in the North Atlantic (western North Pacific), and that there are distinctive inter-basin differences with a clear geographical (over North Atlantic) and quantitative (over North Pacific) separation of typical blocking genesis/lysis regions during the opposing phases of the climate patterns. An Empirical Orthogonal Function (EOF) analysis points to a significant influence of blocking upon the NAO pattern (identifiable as the leading EOF in the Euro-Atlantic), and a temporal analysis indicates that long-lasting blocks are associated with the development of negative NAO/PNA index values throughout their life-time. In addition an indication of a cause-and effect relationship is set-out for the North Atlantic linkage Other/Unknown Material North Atlantic North Atlantic oscillation RERO DOC Digital Library Pacific |
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Open Polar |
collection |
RERO DOC Digital Library |
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ftreroch |
language |
English |
description |
In the Northern hemisphere, regions characterized by an enhanced frequency of atmospheric blocking overlap significantly with those associated with the major extra-tropical patterns of large-scale climate variability—namely the North Atlantic Oscillation (NAO) and the Pacific North American (PNA) pattern. There is likewise an overlap in the temporal band-width of blocks and these climate patterns. Here the nature of the linkage between blocks and the climate patterns is explored by using the ERA-40 re-analysis data set to examine (1) their temporal and spatial correlation and (2) the interrelationship between blocks and the NAO/PNA. It is shown that a strong anti-correlation exists between blocking occurrence and the phase of the NAO (PNA) in the North Atlantic (western North Pacific), and that there are distinctive inter-basin differences with a clear geographical (over North Atlantic) and quantitative (over North Pacific) separation of typical blocking genesis/lysis regions during the opposing phases of the climate patterns. An Empirical Orthogonal Function (EOF) analysis points to a significant influence of blocking upon the NAO pattern (identifiable as the leading EOF in the Euro-Atlantic), and a temporal analysis indicates that long-lasting blocks are associated with the development of negative NAO/PNA index values throughout their life-time. In addition an indication of a cause-and effect relationship is set-out for the North Atlantic linkage |
author |
Croci-Maspoli, Mischa Schwierz, Cornelia Davies, Huw |
spellingShingle |
Croci-Maspoli, Mischa Schwierz, Cornelia Davies, Huw Atmospheric blocking: space-time links to the NAO and PNA |
author_facet |
Croci-Maspoli, Mischa Schwierz, Cornelia Davies, Huw |
author_sort |
Croci-Maspoli, Mischa |
title |
Atmospheric blocking: space-time links to the NAO and PNA |
title_short |
Atmospheric blocking: space-time links to the NAO and PNA |
title_full |
Atmospheric blocking: space-time links to the NAO and PNA |
title_fullStr |
Atmospheric blocking: space-time links to the NAO and PNA |
title_full_unstemmed |
Atmospheric blocking: space-time links to the NAO and PNA |
title_sort |
atmospheric blocking: space-time links to the nao and pna |
publishDate |
2018 |
url |
http://doc.rero.ch/record/321240/files/382_2007_Article_259.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
http://doc.rero.ch/record/321240/files/382_2007_Article_259.pdf |
_version_ |
1766120467538640896 |