Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO.
Abstract. The paper deals with wind measurements, recorded since the 1950s, at twelve meteorological stations along a transect near the westernmost European border, between 64 and 44 N. Extreme wind speed tends to decrease sharply near the northern boundary (at Reykjavick), near the middle of the st...
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ftuniveneziairis:oai:iris.unive.it:10278/15376 2024-04-14T08:13:54+00:00 Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO. PIRAZZOLI P. A. ULLMANN A. TOMASIN, Alberto Pirazzoli, P. A. Tomasin, Alberto Ullmann, A. 2010 http://hdl.handle.net/10278/15376 https://doi.org/10.5194/angeo-28-1-2010 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000274136900001 volume:28 firstpage:1923 lastpage:1934 journal:ANNALES GEOPHYSICAE http://hdl.handle.net/10278/15376 doi:10.5194/angeo-28-1-2010 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-76649140085 Keywords. Meteorology and atmospheric dynamics (Climatology General circulation) info:eu-repo/semantics/article 2010 ftuniveneziairis https://doi.org/10.5194/angeo-28-1-2010 2024-03-21T18:01:37Z Abstract. The paper deals with wind measurements, recorded since the 1950s, at twelve meteorological stations along a transect near the westernmost European border, between 64 and 44 N. Extreme wind speed tends to decrease sharply near the northern boundary (at Reykjavick), near the middle of the study area (at Shannon and Valentia) and near the southern boundary (at Brest and Cap Ferret), to increase at Thorshavn, with less significant trends at the other stations. Average wind speeds confirm the above tendencies, with an additional increasing speed at Lerwick, Kirkwall, Malin Head, Belle-Ile and Cap Ferret. To compare changes in wind activity, the data have been subdivided into three periods: until 1975, 1976–1992 and 1993–2008. Frequencies have been computed also for the “winter” (October to March) period, per quadrants, and for occurrences exceeding the speed of 15ms−1. At Reykjavick a recent increase in the frequency of strong winds has occurred from various directions. Between 62 N (Thorshavn) and 59 N (Kirkwall) strong wind has been increasing since 1975. Minor changes can be observed at Stornoway, whereas at Malin Head the greatest increase for southerlies and westerlies is observed during the 1976–1992 period. At Belmullet, the frequency of strong southerlies has almost doubled since 1992, while at Shannon and Valentia it remains quite low. Finally at Brest and Belle-Ile, westerlies are predominant among winds >15ms−1. Important changes in time and latitude appear in the correlation with the NAO (North Atlantic Oscillation) index. The highest correlation coefficients, calculated with monthly or seasonal means between the early 1950s and 1975, are observed from between 58 N (Stornoway) and Iceland, whereas low positive coefficients are reported more Correspondence to: P. A. Pirazzoli (pirazzol@cnrs-bellevue.fr) south. During the period 1976–1992, when increasing NAO index is predominant, positive correlation improves southwards as far as 54 (Belmullet) with some improvement also at Shannon and ... Article in Journal/Newspaper Iceland North Atlantic North Atlantic oscillation Thorshavn Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Belle Ile ENVELOPE(-109.102,-109.102,62.684,62.684) Thorshavn ENVELOPE(71.083,71.083,-68.683,-68.683) Annales Geophysicae 28 1 1 9 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Keywords. Meteorology and atmospheric dynamics (Climatology General circulation) |
spellingShingle |
Keywords. Meteorology and atmospheric dynamics (Climatology General circulation) PIRAZZOLI P. A. ULLMANN A. TOMASIN, Alberto Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO. |
topic_facet |
Keywords. Meteorology and atmospheric dynamics (Climatology General circulation) |
description |
Abstract. The paper deals with wind measurements, recorded since the 1950s, at twelve meteorological stations along a transect near the westernmost European border, between 64 and 44 N. Extreme wind speed tends to decrease sharply near the northern boundary (at Reykjavick), near the middle of the study area (at Shannon and Valentia) and near the southern boundary (at Brest and Cap Ferret), to increase at Thorshavn, with less significant trends at the other stations. Average wind speeds confirm the above tendencies, with an additional increasing speed at Lerwick, Kirkwall, Malin Head, Belle-Ile and Cap Ferret. To compare changes in wind activity, the data have been subdivided into three periods: until 1975, 1976–1992 and 1993–2008. Frequencies have been computed also for the “winter” (October to March) period, per quadrants, and for occurrences exceeding the speed of 15ms−1. At Reykjavick a recent increase in the frequency of strong winds has occurred from various directions. Between 62 N (Thorshavn) and 59 N (Kirkwall) strong wind has been increasing since 1975. Minor changes can be observed at Stornoway, whereas at Malin Head the greatest increase for southerlies and westerlies is observed during the 1976–1992 period. At Belmullet, the frequency of strong southerlies has almost doubled since 1992, while at Shannon and Valentia it remains quite low. Finally at Brest and Belle-Ile, westerlies are predominant among winds >15ms−1. Important changes in time and latitude appear in the correlation with the NAO (North Atlantic Oscillation) index. The highest correlation coefficients, calculated with monthly or seasonal means between the early 1950s and 1975, are observed from between 58 N (Stornoway) and Iceland, whereas low positive coefficients are reported more Correspondence to: P. A. Pirazzoli (pirazzol@cnrs-bellevue.fr) south. During the period 1976–1992, when increasing NAO index is predominant, positive correlation improves southwards as far as 54 (Belmullet) with some improvement also at Shannon and ... |
author2 |
Pirazzoli, P. A. Tomasin, Alberto Ullmann, A. |
format |
Article in Journal/Newspaper |
author |
PIRAZZOLI P. A. ULLMANN A. TOMASIN, Alberto |
author_facet |
PIRAZZOLI P. A. ULLMANN A. TOMASIN, Alberto |
author_sort |
PIRAZZOLI P. A. |
title |
Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO. |
title_short |
Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO. |
title_full |
Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO. |
title_fullStr |
Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO. |
title_full_unstemmed |
Recent changes in measured wind in the NE Atlantic and variability of correlation with NAO. |
title_sort |
recent changes in measured wind in the ne atlantic and variability of correlation with nao. |
publishDate |
2010 |
url |
http://hdl.handle.net/10278/15376 https://doi.org/10.5194/angeo-28-1-2010 |
long_lat |
ENVELOPE(-109.102,-109.102,62.684,62.684) ENVELOPE(71.083,71.083,-68.683,-68.683) |
geographic |
Belle Ile Thorshavn |
geographic_facet |
Belle Ile Thorshavn |
genre |
Iceland North Atlantic North Atlantic oscillation Thorshavn |
genre_facet |
Iceland North Atlantic North Atlantic oscillation Thorshavn |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000274136900001 volume:28 firstpage:1923 lastpage:1934 journal:ANNALES GEOPHYSICAE http://hdl.handle.net/10278/15376 doi:10.5194/angeo-28-1-2010 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-76649140085 |
op_doi |
https://doi.org/10.5194/angeo-28-1-2010 |
container_title |
Annales Geophysicae |
container_volume |
28 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
9 |
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1796311987871809536 |