Explosive cyclones in the North Atlantic: Nao influence and multidecadal variability
作者： Iñigo Gómara , Belén Rodríguez de Fonseca , Pablo Zurita Gotor
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摘要: espanolEn este estudio se ha analizado la variabilidad en diferentes escalas temporales de las ciclogenesis explosivas que afectan Europa. La identificacion y seguimiento ciclones realizado a traves utilizacion un algoritmo automatico aplicado sobre los datos MSLP del reanalisis NCEP. En total, 406 casos han afectado Europa sido seleccionados (Oct-Mar 1950-2010). primera parte estudio, condiciones circulacion general podrian favorecer el desarrollo explosivo estudiado caracteristicas Oscilacion Atlantico Norte (NAO). Mediante indice NAO diario, resultados muestran como bajo una fase positiva aumentan tanto frecuencia intensidad continente Europeo. existencia corriente chorro mas intensa, zonalmente estirada desplazada hacia NE (caracteristica positiva), comparada con Jet climatologico, seria capaz explicar parcialmente comportamiento. segunda trabajo multidecadal propiedades basicas asociadas enero (latitud media, e intensidad). Nuestros preliminares sugieren Pacifica Decadal (PDO) podria estar modulando latitud media estos eventos. Asimismo, tambien encontrado correlacion significativa escala entre ocurrencia eventos Atlantica Multidecadal (AMO). EnglishIn this study we have analyzed the variability of explosive cyclones affecting Europe at different timescales. Cyclones been identified and tracked through an automatic algorithm that has applied to NCEP reanalysis data. Subsequently, selected from whole climatology extratropical North Atlantic (406 total cases Oct-Mar In first part work, circulation conditions appear be beneficial for development assessed Oscillation (NAO) characteristics. By using Daily Index (DNI), results shown positive phase seems foster such events over Europe. Under phase, become more frequent intense. This fact can partially explained by intense, northeastwardly displaced zonally elongated (compared climatology) Jetstream, which is characteristic phase. second studied in January their basic characteristics (average latitude, frequency intensity). Preliminary suggest Pacific might modulating average latitude Additionally, significant correlation was also found scales between cyclone count
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