Izquierdo, R.; Alarcon, M.; Avila, A. Tethys: revista del temps i el clima de la Mediterrània occidental Vol. 10, p. 45-51 DOI: 10.3369/tethys.2013.10.05 Data de publicació: 2013-10-05 Article en revista
The cluster classification of provenances at a site in the NE Iberian Peninsula indicated that in the period of extended winter (December to March, DJFM) fast Atlantic air flows correspond to positive WeMO index (WeMOi), while negative WeMOi are associated to Mediterranean circulations. The amount of winter precipitation was inversely correlated with winter WeMOi. Wet deposition fluxes of marine-derived (Na+, Mg2+ and Cl-) and anthropogenic-derived (NO3- and K+) ions were significantly (and negatively) related to winter WeMOi. The negative phase of WeMO causes the entry of air masses from the Mediterranean into the Iberian Peninsula, that are enriched with marine ions. For NO3- this result suggests the advection over the Mediterranean of polluted air masses from southern Europe and the scavenging and deposition of this pollution by rain during WeMO negative phases. This will carry long-range pollutants to the NE Iberian Peninsula, but local pollutants may also contribute, as precipitation events from the Mediterranean (associated to negative WeMOi) may incorporate local anthropogenic emissions that build up during the winter anticyclonic episodes typical of the region.
Alarcon, M.; Izquierdo, R.; Avila, A.; Belmonte, J.; Stefanescu, C. Tethys: revista del temps i el clima de la Mediterrània occidental Vol. 7, p. 3-10 DOI: 10.3369/tethys.2010.7.01 Data de publicació: 2010-07-06 Article en revista
Alarcon, M.; Avila, A.; Belmonte, J.; Stefanescu, C.; Izquierdo, R. Tethys: revista del temps i el clima de la Mediterrània occidental num. 7, p. 3-10 DOI: 10.3369/tethys.2010.7.01 Data de publicació: 2010-05-01 Article en revista
The data from surface automatic weather stations show that in the area of the Llobregat delta
(northeast of the Iberian Peninsula) we can observe greater precipitation than in nearby inland
areas (Ordal, Collserola, Garraf), than on the other side of a massif located on the coast (Garraf)
and than on the northern coast. This distribution of the precipitation could be explained by the
formation of a nocturnal surface cold front in the Llobregat delta. In order to analyze in-depth
the physical mechanisms that can influence the formation of this front (topography, sea and
drainage winds), two rain episodes in the area were simulated with the MM5 mesoscale model,
reproducing satisfactorily the physical mechanisms that favor the appearance of the front.
Lana, F.J.; Burgueño, A.; Martinez, M.D.; Serra, C. Tethys: revista del temps i el clima de la Mediterrània occidental num. 6, p. 15-30 DOI: 10.3369/tethys.2009.6.02 Data de publicació: 2009 Article en revista