Urban aerosol size distributions over the Mediterranean city of Barcelona, NE Spain [Discussion paper]

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.FP7-PEOPLE-2009-IEF, Project number 254773, SAPUSS – Solving Aerosol Problems Using Synergistic Strategies (Marie Curie Actions – Intra European Fellowships. Manuel Dall’Osto)