Urban aerosol size distributions over the Mediterranean city of Barcelona, NE Spain
| Autor: | David C. S. Beddows, Jorge Pey, Sergio Rodríguez, Xavier Querol, Roy M. Harrison, Andrés Alastuey, Manuel Dall'Osto |
|---|---|
| Jazyk: | Spanish; Castilian |
| Rok vydání: | 2012 |
| Předmět: |
Pollution
Barcelona Atmospheric Science Meteorology Particle number 010504 meteorology & atmospheric sciences media_common.quotation_subject Population Nucleation Calidad del aire 010501 environmental sciences Atmospheric sciences 01 natural sciences lcsh:Chemistry 11. Sustainability Urban air pollution education Aerosol media_common 0105 earth and related environmental sciences education.field_of_study Diurnal temperature variation lcsh:QC1-999 Dilution Polución urbana Quality of air lcsh:QD1-999 13. Climate action Environmental science Particle lcsh:Physics |
| Zdroj: | Arias Montano. Repositorio Institucional de la Universidad de Huelva instname Digital.CSIC. Repositorio Institucional del CSIC Atmospheric Chemistry and Physics, Vol 12, Iss 22, Pp 10693-10707 (2012) ARCIMIS. Archivo Climatológico y Meteorológico Institucional (AEMET) Agencia Estatal de Meteorología (AEMET) |
| Popis: | Differential mobility particle sizer (DMPS) aerosol concentrations (N13−800) were collected over a oneyear- period (2004) at an urban background site in Barcelona, North-Eastern Spain. Quantitative contributions to particle number concentrations of the nucleation (33–39 %), Aitken (39–49 %) and accumulation mode (18–22 %) were estimated. We examined the source and time variability of atmospheric aerosol particles by using both K-means clustering and Positive Matrix Factorization (PMF) analysis. Performing clustering analysis on hourly size distributions, nine K-means DMPS clusters were identified and, by directional association, diurnal variation and relationship to meteorological and pollution variables, four typical aerosol size distribution scenarios were identified: traffic (69% of the time), dilution (15% of the time), summer background conditions (4% of the time) and regional pollution (12% of the time). According to the results of PMF, vehicle exhausts are estimated to contribute at least to 62–66% of the total particle number concentration, with a slightly higher proportion distributed towards the nucleation mode (34 %) relative to the Aitken mode (28–32 %). Photochemically induced nucleation particles make only a small contribution to the total particle number concentration (2–3% of the total), although only particles larger than 13 nm were considered in this study. Overall the combination of the two statistical methods is successful at separating components and quantifying relative contributions to the particle number population. |
| Databáze: | OpenAIRE |
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