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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ftopenaccessrep:oai:zenodo.org:123933 2023-10-29T02:38:26+01:00 An intercomparison between low-frequency variability indices Stefano Tibaldi P. Bongioannini Cerlini Susanna Corti 1999-01-01 https://www.openaccessrepository.it/record/123933 https://doi.org/10.3402/tellusa.v51i5.14492 und unknown url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/123933 doi:10.3402/tellusa.v51i5.14492 info:eu-repo/semantics/openAccess Atmospheric Science Oceanography info:eu-repo/semantics/article publication-article 1999 ftopenaccessrep https://doi.org/10.3402/tellusa.v51i5.14492 2023-10-03T22:18:07Z 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. DOI:10.1034/j.1600-0870.1999.00016.x Article in Journal/Newspaper North Atlantic North Atlantic oscillation Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Tellus A: Dynamic Meteorology and Oceanography 51 5 773 |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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unknown |
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Atmospheric Science Oceanography |
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Atmospheric Science Oceanography Stefano Tibaldi P. Bongioannini Cerlini Susanna Corti An intercomparison between low-frequency variability indices |
topic_facet |
Atmospheric Science Oceanography |
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. DOI:10.1034/j.1600-0870.1999.00016.x |
format |
Article in Journal/Newspaper |
author |
Stefano Tibaldi P. Bongioannini Cerlini Susanna Corti |
author_facet |
Stefano Tibaldi P. Bongioannini Cerlini Susanna Corti |
author_sort |
Stefano Tibaldi |
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://www.openaccessrepository.it/record/123933 https://doi.org/10.3402/tellusa.v51i5.14492 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/123933 doi:10.3402/tellusa.v51i5.14492 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3402/tellusa.v51i5.14492 |
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Tellus A: Dynamic Meteorology and Oceanography |
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51 |
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5 |
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773 |
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1781064466963628032 |