Connection between NAO, weather types and precipitation in León, Spain (1948-2008)
The variability of winter precipitation in the west of the Iberian Peninsula is strongly affected by the North Atlantic Oscillation (NAO). This study focuses on identifying the relationship that exists between precipitation registered in the city of Léon (in northwestern Spain), the NAO index and th...
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ftria:oai:ria.ua.pt:10773/26609 2023-05-15T17:31:40+02:00 Connection between NAO, weather types and precipitation in León, Spain (1948-2008) Fernández-González, S. del Río, S. Castro, A. Penas, A. Fernández-Raga, M. Calvo, A. I. Fraile, R. 2011 http://hdl.handle.net/10773/26609 https://doi.org/10.1002/joc.2431 eng eng Royal Meteorological Society 0899-8418 http://hdl.handle.net/10773/26609 doi:10.1002/joc.2431 1097-0088 restrictedAccess Logistic regression Rainfall Weather types Spain North Atlantic Oscillation article 2011 ftria https://doi.org/10.1002/joc.2431 2022-05-25T18:37:47Z The variability of winter precipitation in the west of the Iberian Peninsula is strongly affected by the North Atlantic Oscillation (NAO). This study focuses on identifying the relationship that exists between precipitation registered in the city of Léon (in northwestern Spain), the NAO index and the associated weather type during the same period. In order to achieve this objective, the prevailing weather type has been calculated for each day in Léon from January 1948 to March 2009, using the objective Lamb Weather Types classification method. The most significant results appear in winter (from December to March). During these months an increase has been observed in the frequency of ‘anticyclonic’ weather type (A) (very dry), and a decrease in the ‘cyclonic’ (C), ‘south-westerly’ (SW) and ‘westerly’ (W) types (the three rainiest weather types). The positive trend in the NAO index could be the main cause of the decrease in the frequency of the three rainiest weather types (C, SW and W) and therefore, responsible for the relevant decline in winter precipitation observed in the city of Léon. The high correlation coefficients between the NAO index, the frequency of the three rainiest weather types and winter precipitation suggests an interesting method to forecast rainfall. Using a binary logistic regression model, a downscaling model for daily precipitation has been obtained based on the weather types and the NAO index. The daily results obtained for the winter months are good (TSS = 0.64) bearing in mind that only sea level pressure data were used in the logistic model. This study was partially supported by the Regional Government of Castile and Léon (Grants LE014A07 and LE039A10-2), and by the Spanish Ministry of Education (Grants TEC2007-63216 and TEC2010-19241-C02-01). published Article in Journal/Newspaper North Atlantic North Atlantic oscillation Repositório Institucional da Universidade de Aveiro (RIA) International Journal of Climatology 32 14 2181 2196 |
institution |
Open Polar |
collection |
Repositório Institucional da Universidade de Aveiro (RIA) |
op_collection_id |
ftria |
language |
English |
topic |
Logistic regression Rainfall Weather types Spain North Atlantic Oscillation |
spellingShingle |
Logistic regression Rainfall Weather types Spain North Atlantic Oscillation Fernández-González, S. del Río, S. Castro, A. Penas, A. Fernández-Raga, M. Calvo, A. I. Fraile, R. Connection between NAO, weather types and precipitation in León, Spain (1948-2008) |
topic_facet |
Logistic regression Rainfall Weather types Spain North Atlantic Oscillation |
description |
The variability of winter precipitation in the west of the Iberian Peninsula is strongly affected by the North Atlantic Oscillation (NAO). This study focuses on identifying the relationship that exists between precipitation registered in the city of Léon (in northwestern Spain), the NAO index and the associated weather type during the same period. In order to achieve this objective, the prevailing weather type has been calculated for each day in Léon from January 1948 to March 2009, using the objective Lamb Weather Types classification method. The most significant results appear in winter (from December to March). During these months an increase has been observed in the frequency of ‘anticyclonic’ weather type (A) (very dry), and a decrease in the ‘cyclonic’ (C), ‘south-westerly’ (SW) and ‘westerly’ (W) types (the three rainiest weather types). The positive trend in the NAO index could be the main cause of the decrease in the frequency of the three rainiest weather types (C, SW and W) and therefore, responsible for the relevant decline in winter precipitation observed in the city of Léon. The high correlation coefficients between the NAO index, the frequency of the three rainiest weather types and winter precipitation suggests an interesting method to forecast rainfall. Using a binary logistic regression model, a downscaling model for daily precipitation has been obtained based on the weather types and the NAO index. The daily results obtained for the winter months are good (TSS = 0.64) bearing in mind that only sea level pressure data were used in the logistic model. This study was partially supported by the Regional Government of Castile and Léon (Grants LE014A07 and LE039A10-2), and by the Spanish Ministry of Education (Grants TEC2007-63216 and TEC2010-19241-C02-01). published |
format |
Article in Journal/Newspaper |
author |
Fernández-González, S. del Río, S. Castro, A. Penas, A. Fernández-Raga, M. Calvo, A. I. Fraile, R. |
author_facet |
Fernández-González, S. del Río, S. Castro, A. Penas, A. Fernández-Raga, M. Calvo, A. I. Fraile, R. |
author_sort |
Fernández-González, S. |
title |
Connection between NAO, weather types and precipitation in León, Spain (1948-2008) |
title_short |
Connection between NAO, weather types and precipitation in León, Spain (1948-2008) |
title_full |
Connection between NAO, weather types and precipitation in León, Spain (1948-2008) |
title_fullStr |
Connection between NAO, weather types and precipitation in León, Spain (1948-2008) |
title_full_unstemmed |
Connection between NAO, weather types and precipitation in León, Spain (1948-2008) |
title_sort |
connection between nao, weather types and precipitation in león, spain (1948-2008) |
publisher |
Royal Meteorological Society |
publishDate |
2011 |
url |
http://hdl.handle.net/10773/26609 https://doi.org/10.1002/joc.2431 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
0899-8418 http://hdl.handle.net/10773/26609 doi:10.1002/joc.2431 1097-0088 |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.1002/joc.2431 |
container_title |
International Journal of Climatology |
container_volume |
32 |
container_issue |
14 |
container_start_page |
2181 |
op_container_end_page |
2196 |
_version_ |
1766129352003551232 |