Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking
In this paper, Northern Hemisphere winter blocking is analyzed through the introduction of a set of new bidimensional diagnostics based on geopotential height that provide information about the occurrence, the duration, the intensity, and the wave breaking associated with the blocking. This analysis...
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ftunibolognairis:oai:cris.unibo.it:11585/784331 2024-01-28T10:06:13+01:00 Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking Davini P Cagnazzo C Gualdi S Navarra A Davini P Cagnazzo C Gualdi S Navarra A 2012 ELETTRONICO http://hdl.handle.net/11585/784331 https://doi.org/10.1175/JCLI-D-12-00032.1 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000309653800003 volume:25 issue:19 firstpage:6496 lastpage:6509 numberofpages:14 journal:JOURNAL OF CLIMATE http://hdl.handle.net/11585/784331 doi:10.1175/JCLI-D-12-00032.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84864451551 Europe Blocking Wave breaking Climatology info:eu-repo/semantics/article 2012 ftunibolognairis https://doi.org/10.1175/JCLI-D-12-00032.1 2024-01-03T18:02:04Z In this paper, Northern Hemisphere winter blocking is analyzed through the introduction of a set of new bidimensional diagnostics based on geopotential height that provide information about the occurrence, the duration, the intensity, and the wave breaking associated with the blocking. This analysis is performed with different reanalysis datasets in order to evaluate the sensitivity of the index and the diagnostics adopted. In this way, the authors are able to define a new category of blocking placed at low latitudes that is similar to midlatitude blocking in terms of the introduced diagnostics but is unable to divert or block the flow. Furthermore, over the Euro-Atlantic sector it is shown that it is possible to phenomenologically distinguish between high-latitude blocking occurring over Greenland, north of the jet stream and dominated by cyclonic wave breaking, and the traditional midlatitude blocking localized over Europe and driven by anticyclonic wave breaking. These latter events are uniformly present in a band ranging from the Azores up to Scandinavia. Interestingly, a similar distinction cannot be pointed out over the Pacific basin where the blocking activity is dominated by high-latitude blocking occurring over eastern Siberia. Finally, considering the large impact that blocking may have on the Northern Hemisphere, an analysis of the variability and the trend is carried out. This shows a significant increase of Atlantic low-latitude blocking frequency and an eastward displacement of the strongest blocking events over both the Atlantic and Pacific Oceans. Article in Journal/Newspaper Greenland Siberia IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Greenland Pacific Journal of Climate 25 19 6496 6509 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Europe Blocking Wave breaking Climatology |
spellingShingle |
Europe Blocking Wave breaking Climatology Davini P Cagnazzo C Gualdi S Navarra A Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking |
topic_facet |
Europe Blocking Wave breaking Climatology |
description |
In this paper, Northern Hemisphere winter blocking is analyzed through the introduction of a set of new bidimensional diagnostics based on geopotential height that provide information about the occurrence, the duration, the intensity, and the wave breaking associated with the blocking. This analysis is performed with different reanalysis datasets in order to evaluate the sensitivity of the index and the diagnostics adopted. In this way, the authors are able to define a new category of blocking placed at low latitudes that is similar to midlatitude blocking in terms of the introduced diagnostics but is unable to divert or block the flow. Furthermore, over the Euro-Atlantic sector it is shown that it is possible to phenomenologically distinguish between high-latitude blocking occurring over Greenland, north of the jet stream and dominated by cyclonic wave breaking, and the traditional midlatitude blocking localized over Europe and driven by anticyclonic wave breaking. These latter events are uniformly present in a band ranging from the Azores up to Scandinavia. Interestingly, a similar distinction cannot be pointed out over the Pacific basin where the blocking activity is dominated by high-latitude blocking occurring over eastern Siberia. Finally, considering the large impact that blocking may have on the Northern Hemisphere, an analysis of the variability and the trend is carried out. This shows a significant increase of Atlantic low-latitude blocking frequency and an eastward displacement of the strongest blocking events over both the Atlantic and Pacific Oceans. |
author2 |
Davini P Cagnazzo C Gualdi S Navarra A |
format |
Article in Journal/Newspaper |
author |
Davini P Cagnazzo C Gualdi S Navarra A |
author_facet |
Davini P Cagnazzo C Gualdi S Navarra A |
author_sort |
Davini P |
title |
Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking |
title_short |
Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking |
title_full |
Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking |
title_fullStr |
Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking |
title_full_unstemmed |
Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking |
title_sort |
bidimensional diagnostics, variability, and trends of northern hemisphere blocking |
publishDate |
2012 |
url |
http://hdl.handle.net/11585/784331 https://doi.org/10.1175/JCLI-D-12-00032.1 |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland Siberia |
genre_facet |
Greenland Siberia |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000309653800003 volume:25 issue:19 firstpage:6496 lastpage:6509 numberofpages:14 journal:JOURNAL OF CLIMATE http://hdl.handle.net/11585/784331 doi:10.1175/JCLI-D-12-00032.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84864451551 |
op_doi |
https://doi.org/10.1175/JCLI-D-12-00032.1 |
container_title |
Journal of Climate |
container_volume |
25 |
container_issue |
19 |
container_start_page |
6496 |
op_container_end_page |
6509 |
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1789332939615502336 |