Mots-clés
Analyse régionale Circulation atmosphérique Gradient thermique Humidité Précipitation Royaume-Uni Scotland Sécheresse Température Variabilité saisonnière Atmospheric circulation Drought Moisture Precipitation Regional analysis Scotland Seasonal variability Temperature Temperature gradient United Kingdom atmospheric circulation autumn cluster analysis principal component analysis rainfall winter Análisis regional Circulación atmosférica Escocia Gradiente térmico Humedad Precipitación Reino Unido Sequía Temperatura Variabilidad estacionalAutumn and Extended Winter Daily Precipitation Variability over Central and Southern Scotland
Auteur(s) et Affiliation(s)
Smith, Kieran
School of Geography, Earth and Environmental Sciences, University of Birmingham
Phillips, Ian D.
School of Geography, Earth and Environmental Sciences, University of Birmingham
Description :
This paper analyses the main geographic patterns of rainfall variability over Central and Southern Scotland at the daily timescale during the autumn and extended winter (SONDJFM) period. Principal component analysis (PCA) is used to identify the most important rainfall patterns, with the first eight principal components (PC) accounting for 85.2% of the variance. The most important pattern (PC 1) is associated with a cyclonic W/SW flow and produces the wettest conditions in Renfrewshire and Dumbartonshire (PC 1); rainfall under the PC 1 pattern is widespread, with even the drier sites in eastern Scotland recording comparatively high totals. PC 2 produces wetter than average conditions in eastern Scotland (especially the Scottish Borders region) and so reduces the average rainfall gradient between the west (wetter) and the east (drier). All eight significant PCs are explained in terms of the atmospheric circulation and the geography of Scotland. Cluster analysis is then used to identify coherent rainfall regions. The regions on easterly days show the most difference from the other directions and the regions derived across all days.
Type de document :
Article de périodique
Source :
Scottish geographical journal (Online), issn : 1751-665X, 2012, vol. 128, n°. 1, p. 42-63, nombre de pages : 22
Date :
2012
Identifiants :
doi : http://dx.doi.org/10.1080/14702541.2012.691337
Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)