Formation and chemical evolution of SOA in two different environments: A dual chamber study

• DOI: 10.5194/egusphere-2024-1317
• Publication Date: 2024-05-14T13:24:11Z
• Authors: Andreas Aktypis; Dontavious Sippial; Christina Vasilak...; Angeliki Matrali; Christos Kaltsono...; Andrea Simonati; Marco Paglione; Matteo Rinaldi; Stefano Decesari; Spyros Pandis
• Keywords: Chemical evolution

Abstract. A dual chamber system was deployed in two different environments to study the potential of ambient air, that directly injected into chambers, form secondary organic and inorganic aerosol. total 16 experiments took place during March 2022 a polluted environment Po Valley, Italy which is dominated by anthropogenic emissions. Another 15 were conducted Pertouli forest, Greece biogenic In both campaigns, air containing highly oxidized (average O:C 0.7–0.8) aerosol starting point its chemical evolution under presence OH radicals followed. Valley SOA formation observed all but one formed ranged from 0.1 10 μg m-3. Experiments more conditions (usually at night early morning) had significantly higher formation, with concentration end being about four times than initial. Also, production 4–230 m-3 ammonium nitrate due high levels ammonia this area. The produced increased as relative humidity increased, there not clear relationship between temperature. Higher when PM1 high. Contrary only experiment forest resulted detectable (about 1 m-3). This characterized concentrations monoterpenes isoprene. experiments, some formed, dropped below detection after 30 min. behavior consistent local well mixed. Although have OA range 0.7–0.8, atmosphere sites very potentials forming SOA. reacts rapidly large amounts SOA, while corresponding chemistry appears been practically terminated before beginning most so little additional left.