Atmospheric soot particle transformation from urban to rural

Sammanfattning: The main objective of this work was to investigate if there is a contribution of aerosol from the urban region of Copenhagen at the rural station Vavihill. This was done by analyzing measurement data between 1st of January and the 28th of February 2013 measured with a Dierential Mobility Particle Sizer (DMPS), Soot Particle Aerosol Mass Spectrometer (SP-AMS), a Cloud Condensation Nuclei Counter (CCNC) and a NOx-analyzer. To determine if the air masses passed over Copenhagen or not, the Hybrid Single-Particle Lagrangian Integrated Trajectory 4 (HYSPLIT4) was used to model air mass origin with six-hour intervals. The data consisted of measurements of particle number concentration, refractory black carbon (rBC) mass concentration, cloud condensation nuclei (CCN) concentration and NOx concentration. The measurements showed a noticeable dierence with higher concentration (rBC: 33 %, CCN: 30-42 %, NOx: 58 %) and a larger number concentration of particles (36%) for the air masses passing over Copenhagen. The analyzed time series were too short to nd statically signicant contributions from Copenhagen to the aerosol composition in Vavihill. To determine if there really is a signicant contribution of aerosol from the urban region of Copenhagen at the rural background station Vavihill, further investigations should be made.