Canvi climàtic: evidències científiques i impactes.

Alarcón M, Àvila A, Cunillera J (2011) Canvi climàtic: evidències científiques i impactes. Edicions UPC. Col·lecció Hyperion.

Aula d’Ecologia. Ciència i Tècnica 41. Cicle de Conferències 2010.

Àvila A, Terradas J (Eds) (2011) Aula d’Ecologia. Ciència i Tècnica 41. Cicle de Conferències 2010. Servei de Publicacions. Universitat Autònoma de Barcelona. Bellaterra. ISBN: 978-84-490-2676-8.

Moroccan source areas for the Painted Lady butterfly, Vanessa cardui (Nymphalidae: Nymphalinae), migrating into Europe in spring.

Stefanescu C, Alarcón M, Izquierdo R, Páramo F, Àvila A (2011) Moroccan source areas for the Painted Lady butterfly, Vanessa cardui (Nymphalidae: Nymphalinae), migrating into Europe in spring. Journal of the Lepidopterists Society 65: 15-26.

Source apportionment for African dust outbreaks over the Western Mediterranean using the HYSPLIT model

Escudero M., Stein A.F., Draxler R.R., Querol X., Alastuey A., Castillo S., Avila A. (2011) Source apportionment for African dust outbreaks over the Western Mediterranean using the HYSPLIT model. Atmospheric Research. 99: 518-527.
Enllaç
Doi: 10.1016/j.atmosres.2010.12.002

Resum:

A source apportionment technique has been applied to determine the geographical distribution of emissions in Northern Africa contributing to dust outbreaks that yield high PM10 levels at Spanish regional background stations. Seven dust episodes have been analyzed in this study. Total suspended particles have been sampled and chemically analyzed for these events at La Castanya background station (Montseny, NE Spain) and differences in the composition of airborne dust have been studied. The dominant role of northern and western source areas (Tunisia, Algeria, Mauritania and the Western Sahara) contrasted with the negligible contribution of major emission source areas such as the Bodelé depression, Libya, Niger, and Sudan. During the simulated events using the dust module of the HYSPLIT model, material from the latter regions is persistently transported across the Atlantic but not towards Western Europe. As a consequence, the composition of the dust turned out to be quite homogeneous since the mixing of dust occurs from various source areas with similar chemical composition. However, differences in Ca/Al ratios have been found in a number of samples that are mainly explained by vertical transport segregation of clay minerals (relatively richer in Al) from coarser dust particles (Ca-carbonate). © 2010 Elsevier B.V.

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Changes in atmospheric deposition and streamwater chemistry over 25 years in undisturbed catchments in a Mediterranean mountain environment.

Avila A, Rodà F (2011) Changes in atmospheric deposition and streamwater chemistry over 25 years in undisturbed catchments in a Mediterranean mountain environment. Science of the Total Environment doi: org/10.1016/j.scitotenv.2011.11.062.

Source areas and long-range transport of pollen from continental land to Tenerife (Canary Islands)

Izquierdo R., Belmonte J., Avila A., Alarcón M., Cuevas E., Alonso-Pérez S. (2011) Source areas and long-range transport of pollen from continental land to Tenerife (Canary Islands). International Journal of Biometeorology. 55: 67-85.
Enllaç
Doi: 10.1007/s00484-010-0309-1

Resum:

The Canary Islands, due to their geographical position, constitute an adequate site for the study of long-range pollen transport from the surrounding land masses. In this study, we analyzed airborne pollen counts at two sites: Santa Cruz de Tenerife (SCO), at sea level corresponding to the marine boundary layer (MBL), and Izaña at 2,367 m.a.s.l. corresponding to the free troposphere (FT), for the years 2006 and 2007. We used three approaches to describe pollen transport: (1) a classification of provenances with an ANOVA test to describe pollen count differences between sectors; (2) a study of special events of high pollen concentrations, taking into consideration the corresponding meteorological synoptic pattern responsible for transport and back trajectories; and (3) a source-receptor model applied to a selection of the pollen taxa to show pollen source areas. Our results indicate several extra-regional pollen transport episodes to Tenerife. The main provenances were: (1) the Mediterranean region, especially the southern Iberian Peninsula and Morocco, through the trade winds in the MBL. These episodes were characterized by the presence of pollen from trees (Casuarina, Olea, Quercus perennial and deciduous types) mixed with pollen from herbs (Artemisia, Chenopodiaceae/Amaranthaceae and Poaceae wild type). (2) The Saharan sector, through transport at the MBL level carrying pollen principally from herbs (Chenopodiaceae-Amaranthaceae, Cyperaceae and Poaceae wild type) and, in one case, Casuarina pollen, uplifted to the free troposphere. And (3) the Sahel, characterized by low pollen concentrations of Arecaceae, Chenopodiaceae-Amaranthaceae, Cyperaceae and Poaceae wild type in sporadic episodes. This research shows that sporadic events of long-range pollen transport need to be taken into consideration in Tenerife as possible responsible agents in respiratory allergy episodes. In particular, it is estimated that 89-97% of annual counts of the highly allergenous Olea originates from extra-regional sources in southern Iberia and northern Africa. © 2010 ISB.

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Transport de pol.len a llarga distància.

Izquierdo R, Belmonte J, Àvila A, Alarcón M, Alonso S, Cuevas E (2011) Transport de pol.len a llarga distància. UAB Divulga. Abril 2011.