Belmonte J., Alarcón M., Avila A., Scialabba E., Pino D. (2008) Long-range transport of beech (Fagus sylvatica L.) pollen to Catalonia (north-eastern Spain). International Journal of Biometeorology. 52: 675-687.EnllaçDoi: 10.1007/s00484-008-0160-9
Local and long-range transport of beech (Fagus sylvatica) pollen was analysed by using 23-year data (1983-2007) at six stations in Catalonia, Spain, and numerical simulations. Back trajectories and synoptic meteorology indicated a consistent north European provenance during beech pollen peak days. Specifically, the area from northern Italy to central Germany was the most probable source, as indicated by a source-receptor model based on back trajectories. For the event with the highest pollen levels (17 May 2004), back trajectories indicated a source in the Vosges (NE France) and the Schwarzwald (SW Germany) regions. By applying a mesoscale model (MM5) to this event, pollen transport could be further refined, allowing its entrance to Catalonia through the lower easternmost pass of the Pyrenees (the Alberes pass, 500 m a.s.l.) to be described. Hourly counts of Fagus pollen allowed the timing of pollen arrival during this episode to be matched with the model results regarding the above-mentioned passage. This study may help to interpret some results of modern beech genetic diversity and contribute to the understanding of paleopalynological records by taking long-range transport into consideration. © 2008 ISB.
Puig R., Àvila A., Soler A. (2008) Sulphur isotopes as tracers of the influence of a coal-fired power plant on a Scots pine forest in Catalonia (NE Spain). Atmospheric Environment. 42: 733-745.EnllaçDoi: 10.1016/j.atmosenv.2007.09.059
Stable sulphur isotopes and major ionic composition were analysed in precipitation and throughfall samples from a Scots pine (Pinus sylvestris, L.) forest near the Cercs coal-fired power plant (Catalonia, NE Spain). The purpose of the study was to determine the main sources of sulphur deposition on this pine forest. Sulphur isotope measurements from the SO2 power plant stack emissions were used to identify the isotopic signature of this source. Net throughfall fluxes of sulphur (26.1 kg S ha1 yr-1) and nitrogen (16.3 kg N ha-1 yr-1) were higher-5-25 times higher for S and 5-15 times for N-at this site than in other forests in Catalonia. Sulphur isotope analysis confirmed that the net throughfall fluxes of sulphur were mostly due to the dry deposition of the SO2 power plant emissions onto the pine canopies. Two potential atmospheric end-members were distinguished: regional background rainwater (δ34S=+7.2‰) and power plant emissions (δ34S=-2.8‰). By applying a two-component sulphur isotope mixing model, we found that during periods of low power plant activity (≤10 emission h day-1), 62% of the throughfall sulphate could be attributed to the power plant emissions. At higher activity periods (≥14 emission h day-1), this contribution rose to 73%. Although power plant contribution to bulk deposition was lower in both cases (34% and 45%), the possible influence of sulphate coming with long-range transport events from the polluted areas in the Mediterranean basin (δ34S≈0‰) was not discarded. © 2007 Elsevier Ltd. All rights reserved.
Belmonte J, Alarcón M, Avila A, Izquierdo R, Cuevas E (2008) Foreign allergenic pollen. Some cases observed in Catalonia (NE Spain) and Tenerife (Canary Islands). Allergy 63 (suppl. 88): 104-105.
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