Influence of long-range atmospheric transport pathways and climate teleconnection patterns on the variability of surface210Pb and7Be concentrations in southwestern Europe.
The variability of the atmospheric concentration of the7Be and210Pb radionuclides is strongly linked to the origin of air masses, the strength of their sources and the processes of wet and dry deposition. It has been shown how these processes and their variability are strongly affected by climate change. Thus, a deeper knowledge of the relationship between the atmospheric radionuclides variability measured close to the ground and these atmospheric processes could help in the analysis of climate scenarios. In the present study, we analyze the atmospheric variability of a 14-year time series of7Be and210Pb in a Mediterranean coastal city using a synergy of different indicators and tools such as: the local meteorological conditions, global and regional climate indexes and a lagrangian atmospheric transport model. We particularly focus on the relationships between the main pathways of air masses and sun spots occurrence, the variability of the local relative humidity and temperature conditions, and the main modes of regional climate variability, such as the North Atlantic Oscillation (NAO) and the Western Mediterranean Oscillation (WeMO). The variability of the observed atmospheric concentrations of both7Be and210Pb radionuclides was found to be mainly positively associated to the local climate conditions of temperature and to the pathways of air masses arriving at the station. Measured radionuclide concentrations significantly increase when air masses travel at low tropospheric levels from central Europe and the western part of the Iberian Peninsula, while low concentrations are associated with westerly air masses. We found a significant negative correlation between the WeMO index and the atmospheric variability of both radionuclides and no significant association was observed for the NAO index.
Institut Català de Cienciès del Clima (IC3), Barcelona, Spain. Electronic address: claudia.grossi@ic3.cat.
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Grossi
Institut Català de Cienciès del Clima (IC3), Barcelona, Spain.
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Ballester
Institut de Tècniques Energètiques (INTE), Universitat Politècnica de Catalunya (UPC), Barcelona, Spain.
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Serrano
European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy.
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Galmarini
Institut de Tècniques Energètiques (INTE), Universitat Politècnica de Catalunya (UPC), Barcelona, Spain.
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Camacho
Institut Català de Cienciès del Clima (IC3), Barcelona, Spain.
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Curcoll
Institut Català de Cienciès del Clima (IC3), Barcelona, Spain; Departament d'Ecologia, Universitat de Barcelona (UB), Barcelona, Spain.
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Morguí
Institut Català de Cienciès del Clima (IC3), Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain.
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Rodò
Institut de Tècniques Energètiques (INTE), Universitat Politècnica de Catalunya (UPC), Barcelona, Spain.
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Duch
D000396:Air Pollutants, Radioactive / Q000032:analysis*; D001272:Atmosphere / Q000737:chemistry; D001608:Beryllium / Q000032:analysis*; D057231:Climate Change; D005060:Europe; D007856:Lead Radioisotopes / Q000032:analysis*; D011834:Radiation Monitoring; D011868:Radioisotopes / Q000032:analysis*
D000396:Air Pollutants, Radioactive; D007856:Lead Radioisotopes; D011868:Radioisotopes; D001608:Beryllium
(210)Pb; (7)Be; Air masses pathways; Climate; NAO; WeMO