The 850 hPa relative vorticity centres of action for winter precipitation in the Greek area
Abstract In this work, the relationship between atmospheric circulation over Europe and precipitation in Greece is studied during high winter (January–February). Specifically, the 850 hPa relative vorticity centres, affecting or related to precipitation in the various areas of Greece, are defined an...
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crwiley:10.1002/joc.909 2024-06-02T08:11:34+00:00 The 850 hPa relative vorticity centres of action for winter precipitation in the Greek area Bartzokas, A. Lolis, C. J. Metaxas, D. A. 2003 http://dx.doi.org/10.1002/joc.909 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.909 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.909 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 23, issue 7, page 813-828 ISSN 0899-8418 1097-0088 journal-article 2003 crwiley https://doi.org/10.1002/joc.909 2024-05-03T11:48:13Z Abstract In this work, the relationship between atmospheric circulation over Europe and precipitation in Greece is studied during high winter (January–February). Specifically, the 850 hPa relative vorticity centres, affecting or related to precipitation in the various areas of Greece, are defined and the corresponding temporal variability of both parameters is examined. Factor analysis is first applied on both fields, in order to reduce the dimensionality of the original data sets. Canonical correlation analysis is then applied on the factor analysis results, in order to interrelate the two parameters. It is found that: (i) precipitation over western and northern Greece, the eastern Aegean islands and the western Turkish coasts is mainly controlled by vorticity over Italy and the Gulf of Genoa; (ii) southern Aegean Sea and Crete precipitation is controlled by relative vorticity west of Crete; and (iii) eastern mainland areas precipitation is significantly affected by a vorticity seesaw between Tunisia and the northern Aegean. The temporal variations of precipitation and relative vorticity parameters over the above areas show a precipitation reduction over most Greek stations, combined with enhanced anticyclonic activity over almost the whole Mediterranean during the late 1980s and the early 1990s, a period characterized by high North Atlantic oscillation index values. Finally, cluster analysis is applied on the factor scores time series of precipitation, in order to classify the winter precipitation anomaly patterns into objectively defined clusters. Six main precipitation patterns were revealed and the corresponding relative vorticity mean anomaly regimes over southern Europe indicate the atmospheric circulation characteristics causing these specific patterns. Copyright © 2003 Royal Meteorological Society Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library International Journal of Climatology 23 7 813 828 |
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English |
description |
Abstract In this work, the relationship between atmospheric circulation over Europe and precipitation in Greece is studied during high winter (January–February). Specifically, the 850 hPa relative vorticity centres, affecting or related to precipitation in the various areas of Greece, are defined and the corresponding temporal variability of both parameters is examined. Factor analysis is first applied on both fields, in order to reduce the dimensionality of the original data sets. Canonical correlation analysis is then applied on the factor analysis results, in order to interrelate the two parameters. It is found that: (i) precipitation over western and northern Greece, the eastern Aegean islands and the western Turkish coasts is mainly controlled by vorticity over Italy and the Gulf of Genoa; (ii) southern Aegean Sea and Crete precipitation is controlled by relative vorticity west of Crete; and (iii) eastern mainland areas precipitation is significantly affected by a vorticity seesaw between Tunisia and the northern Aegean. The temporal variations of precipitation and relative vorticity parameters over the above areas show a precipitation reduction over most Greek stations, combined with enhanced anticyclonic activity over almost the whole Mediterranean during the late 1980s and the early 1990s, a period characterized by high North Atlantic oscillation index values. Finally, cluster analysis is applied on the factor scores time series of precipitation, in order to classify the winter precipitation anomaly patterns into objectively defined clusters. Six main precipitation patterns were revealed and the corresponding relative vorticity mean anomaly regimes over southern Europe indicate the atmospheric circulation characteristics causing these specific patterns. Copyright © 2003 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Bartzokas, A. Lolis, C. J. Metaxas, D. A. |
spellingShingle |
Bartzokas, A. Lolis, C. J. Metaxas, D. A. The 850 hPa relative vorticity centres of action for winter precipitation in the Greek area |
author_facet |
Bartzokas, A. Lolis, C. J. Metaxas, D. A. |
author_sort |
Bartzokas, A. |
title |
The 850 hPa relative vorticity centres of action for winter precipitation in the Greek area |
title_short |
The 850 hPa relative vorticity centres of action for winter precipitation in the Greek area |
title_full |
The 850 hPa relative vorticity centres of action for winter precipitation in the Greek area |
title_fullStr |
The 850 hPa relative vorticity centres of action for winter precipitation in the Greek area |
title_full_unstemmed |
The 850 hPa relative vorticity centres of action for winter precipitation in the Greek area |
title_sort |
850 hpa relative vorticity centres of action for winter precipitation in the greek area |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1002/joc.909 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.909 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.909 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
International Journal of Climatology volume 23, issue 7, page 813-828 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.909 |
container_title |
International Journal of Climatology |
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23 |
container_issue |
7 |
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813 |
op_container_end_page |
828 |
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1800757757090988032 |