AIRUSE-LIFE +: estimation of natural source contributions to urban ambient air PM10 and PM2. 5 concentrations in southern Europe – implications to compliance with limit values
Autor: | Giulia Calzolai, Konstantinos Eleftheriadis, C. Colombi, Casimiro Pio, Silvia Nava, St Pateraki, Evangelia Diapouli, Franco Lucarelli, S. Vratolis, Danilo Custódio, George Kallos, Andrés Alastuey, Xavier Querol, K. Bairachtari, Vasiliki Vasilatou, Angeliki Karanasiou, Célia Alves, Fulvio Amato, Christos Spyrou, V. Gianelle, M. Manousakas |
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Rok vydání: | 2017 |
Předmět: |
Estimation
Atmospheric Science food.ingredient 010504 meteorology & atmospheric sciences Meteorology Sea salt 010501 environmental sciences Structural basin Particulates Atmospheric sciences 01 natural sciences Ambient air Eastern mediterranean food 13. Climate action 11. Sustainability Natural source Environmental science 0105 earth and related environmental sciences |
Zdroj: | Atmospheric Chemistry and Physics |
ISSN: | 1680-7324 |
DOI: | 10.5194/acp-17-3673-2017 |
Popis: | The contribution of natural sources to ambient air particulate matter (PM) concentrations is often not considered; however, it may be significant for certain areas and during specific periods of the year. In the framework of the AIRUSE-LIFE+ project, state-of-the-art methods have been employed for assessing the contribution of major natural sources (African dust, sea salt and forest fires) to PM concentrations, in southern European urban areas. 24 h measurements of PM10 and PM2. 5 mass and chemical composition were performed over the course of a year in five cities: Porto, Barcelona, Milan, Florence and Athens. Net African dust and sea-salt concentrations were calculated based on the methodologies proposed by the EC (SEC 2011/208). The contribution of uncontrolled forest fires was calculated through receptor modelling. Sensitivity analysis with respect to the calculation of African dust was also performed, in order to identify major parameters affecting the estimated net dust concentrations. African dust contribution to PM concentrations was more pronounced in the eastern Mediterranean, with the mean annual relative contribution to PM10 decreasing from 21 % in Athens, to 5 % in Florence, and around 2 % in Milan, Barcelona and Porto. The respective contribution to PM2. 5 was calculated equal to 14 % in Athens and from 1.3 to 2.4 % in all other cities. High seasonal variability of contributions was observed, with dust transport events occurring at different periods in the western and eastern Mediterranean basin. Sea salt was mostly related to the coarse mode and also exhibited significant seasonal variability. Sea-salt concentrations were highest in Porto, with average relative contributions equal to 12.3 % for PM10. Contributions from uncontrolled forest fires were quantified only for Porto and were low on an annual basis (1.4 and 1.9 % to PM10 and PM2. 5, respectively); nevertheless, contributions were greatly increased during events, reaching 20 and 22 % of 24 h PM10 and PM2. 5 concentrations, respectively. |
Databáze: | OpenAIRE |
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