München 2019 – scientific programme

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UP: Fachverband Umweltphysik

UP 7: Clouds and aerosols

UP 7.4: Talk

Wednesday, March 20, 2019, 17:30–17:50, HS 22

Ultrafine particles in the lower troposphere: major sources, invisible plumes and meteorological transport processes — •Wolfgang Junkermann¹ and Jorg Hacker² — ¹KIT, IMK-IFU, Garmisch-P, Germany — ²Airborne Research Australia, Salisbury South, SA

Ultrafine particles in the atmosphere are key factors for aerosol cloud interaction as they affect cloud droplet size distributions, latent heat transport into elevated layers via droplet evaporation and precipitation properties via delayed raindrop generation and possibly invigoration of torrential rains. They are spatially and temporarily highly uneven distributed, suggesting the presence of strong sources either for primary particle emissions or for particle precursor materials. Airborne investigations allow to identify major anthropogenic primary particle emitters, their source strength and contribution to the ultrafine particle budget. Emissions in mid elevations of the planetary boundary layer are transported over hundreds of km and vertically mixed by thermal convection on different time scales. Meteorological processes explain the spatial and temporal patterns of number and size distributions of ultrafine nucleation mode particles observations. Results from airborne experiments in clean and polluted Environments, their dependence on meteorology and the impact on rainfall distribution and the regional to continental scale hydrological cycle will be discussed.