An intercomparison between low-frequency variability indices
Possible connections between spatial patterns, of limited regional extent and identified in teleconnectionpatterns and in blocking climatology studies, with hemispheric planetary-wave activitymodes defined by the wave amplitude index (WAI) are investigated. The WAI probabilitydensity function (PDF)...
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ftuniperugiairis:oai:research.unipg.it:11391/1548320 2024-04-14T08:15:34+00:00 An intercomparison between low-frequency variability indices P. Bongioannini Cerlini S. Corti S. Tibaldi Bongioannini Cerlini, P. Corti, S. Tibaldi, S. 1999 https://hdl.handle.net/11391/1548320 https://doi.org/10.3402/tellusa.v51i5.14492 https://www.tandfonline.com/doi/abs/10.3402/tellusa.v51i5.14492 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000083609700016 volume:51 issue:5 firstpage:773 lastpage:789 numberofpages:17 journal:TELLUS. SERIES A, DYNAMIC METEOROLOGY AND OCEANOGRAPHY https://hdl.handle.net/11391/1548320 doi:10.3402/tellusa.v51i5.14492 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0343920759 https://www.tandfonline.com/doi/abs/10.3402/tellusa.v51i5.14492 atmospheric blocking atmospheric dynamics North Atlantic Oscillation planetary wave teleconnection info:eu-repo/semantics/article 1999 ftuniperugiairis https://doi.org/10.3402/tellusa.v51i5.14492 2024-03-21T15:41:54Z Possible connections between spatial patterns, of limited regional extent and identified in teleconnectionpatterns and in blocking climatology studies, with hemispheric planetary-wave activitymodes defined by the wave amplitude index (WAI) are investigated. The WAI probabilitydensity function (PDF) for the northern extratropics winter fields is estimated and the sensitivityof the WAI distribution to the presence of low-frequency variability modes is evaluated bystratifying the available dataset according to the sign of blocking and teleconnection indices.It is found that low-frequency variability modes affect both the mean and the variance of thewave amplitude index. Both the positive phase of the North Atlantic Oscillation (NAO) andthe negative phase of the Pacific North American pattern (PNA) are associated with anenhanced frequency of very large amplitude planetary waves. Furthermore, distributions characterisedby a maximum corresponding to high WAI values also exhibit a large variance. NegativeNAO and positive PNA influence the mean and the variance of WAI PDF in the oppositesense. Similar results are found when the blocking index is considered. WAI PDFs relative tohighly blocked months are broader with a secondary maximum corresponding to very highWAI values. Article in Journal/Newspaper North Atlantic North Atlantic oscillation IRIS Università degli Studi di Perugia Pacific Tellus A: Dynamic Meteorology and Oceanography 51 5 773 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Perugia |
op_collection_id |
ftuniperugiairis |
language |
English |
topic |
atmospheric blocking atmospheric dynamics North Atlantic Oscillation planetary wave teleconnection |
spellingShingle |
atmospheric blocking atmospheric dynamics North Atlantic Oscillation planetary wave teleconnection P. Bongioannini Cerlini S. Corti S. Tibaldi An intercomparison between low-frequency variability indices |
topic_facet |
atmospheric blocking atmospheric dynamics North Atlantic Oscillation planetary wave teleconnection |
description |
Possible connections between spatial patterns, of limited regional extent and identified in teleconnectionpatterns and in blocking climatology studies, with hemispheric planetary-wave activitymodes defined by the wave amplitude index (WAI) are investigated. The WAI probabilitydensity function (PDF) for the northern extratropics winter fields is estimated and the sensitivityof the WAI distribution to the presence of low-frequency variability modes is evaluated bystratifying the available dataset according to the sign of blocking and teleconnection indices.It is found that low-frequency variability modes affect both the mean and the variance of thewave amplitude index. Both the positive phase of the North Atlantic Oscillation (NAO) andthe negative phase of the Pacific North American pattern (PNA) are associated with anenhanced frequency of very large amplitude planetary waves. Furthermore, distributions characterisedby a maximum corresponding to high WAI values also exhibit a large variance. NegativeNAO and positive PNA influence the mean and the variance of WAI PDF in the oppositesense. Similar results are found when the blocking index is considered. WAI PDFs relative tohighly blocked months are broader with a secondary maximum corresponding to very highWAI values. |
author2 |
Bongioannini Cerlini, P. Corti, S. Tibaldi, S. |
format |
Article in Journal/Newspaper |
author |
P. Bongioannini Cerlini S. Corti S. Tibaldi |
author_facet |
P. Bongioannini Cerlini S. Corti S. Tibaldi |
author_sort |
P. Bongioannini Cerlini |
title |
An intercomparison between low-frequency variability indices |
title_short |
An intercomparison between low-frequency variability indices |
title_full |
An intercomparison between low-frequency variability indices |
title_fullStr |
An intercomparison between low-frequency variability indices |
title_full_unstemmed |
An intercomparison between low-frequency variability indices |
title_sort |
intercomparison between low-frequency variability indices |
publishDate |
1999 |
url |
https://hdl.handle.net/11391/1548320 https://doi.org/10.3402/tellusa.v51i5.14492 https://www.tandfonline.com/doi/abs/10.3402/tellusa.v51i5.14492 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000083609700016 volume:51 issue:5 firstpage:773 lastpage:789 numberofpages:17 journal:TELLUS. SERIES A, DYNAMIC METEOROLOGY AND OCEANOGRAPHY https://hdl.handle.net/11391/1548320 doi:10.3402/tellusa.v51i5.14492 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0343920759 https://www.tandfonline.com/doi/abs/10.3402/tellusa.v51i5.14492 |
op_doi |
https://doi.org/10.3402/tellusa.v51i5.14492 |
container_title |
Tellus A: Dynamic Meteorology and Oceanography |
container_volume |
51 |
container_issue |
5 |
container_start_page |
773 |
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