Influence from long-distance transport, local sources and precipitation on black carbon concentrations at a rural background field station in southern Sweden

Abstract: The year 2018 was the first complete year with aerosol observations at the rural background station Hyltemossa in southern Sweden. The aim of this thesis was to analyse and investigate the influence from long-distance transport (LDT) aerosols, local sources and precipitation on the black carbon (BC) mass concentration by utilising the Aethalometer and the HYSPLIT model, which estimated the BC mass concentration ([BC]) and simulated the origin of the LDT air masses to Hyltemossa, respectively. The results were evaluated in terms of the probability distribution and geometric mean of [BC]. They indicate that air masses that contained relatively high [BC] at Hyltemossa station tended to originate from Eastern Europe through LDT air masses. Additionally, the influence from local sources (Øresund) had a statistically significant local contribution to [BC] after eliminating the influence from Eastern Europe. Moreover, the estimated geometric mean of [BC] had a decreasing trend as the accumulated precipitation increased (wet scavenging). In the last section, the local contribution to [BC] at a busy street in Malmö was estimated and compared with the [BC] at Hyltemossa station.