| Timetable |
| Download Conference Program |
| Download All Abstracts |
| Zoom Access |
| Corporate Program |
Oral Sessions
Day 2, June 23（Mon.） 15:10-15:25
Room B (Maesato Center)
- 2B-O2-1510
Investigating the Health- and Climate-Relevant Chemical Composition of Wildfire Smoke Particles and Marine Aerosols by a Novel On-Line Single Particle Mass Spectrometry Technology
(1Univ. Rostock/HMGU, 2Univ. Eastern Finland/Kuopio, 3Photonion GmbH)
Johannes Passig1, Olli Sippula2, Hassib Hakim1, Annele Virtanen2, Mika Ihalainen2, Iva Rosewig1, Robert Irsig3, oRalf Zimmermann1
Wildfire emissions are chemically ultra-complexand impact climate and human health. Chemical parameters determine adverse outcomes by affecting optical/radiative properties of nanoparticles, their cloud condensation nucleation (CCN) activity and toxicological potency.
We developed novel laser-ionization schemes, exploiting resonances between the incident laser light and particle-bound molecules/atoms in on-line Single-Particle Mass Spectrometry (SPMS). The detection of health-relevant Polycyclic Aromatic Hydrocarbons (PAH) on individual nanoparticles became firstly possible. We studied the emissions from typical boreal forest vegetation wildfire-models, observing the time-resolved formation of oxalate/glyoxal during photochemical smog-chamber ageing. For non-polar PAH we found, after initially high concentrations, their rapid degradation upon photochemical-ageing. The inorganic particle-composition revealed high concentrations of potassium and sulphate, which have significant impact on particle-hygroscopicity and thus on their (climate-relevant) CCN-potential. We demonstrate, that our new SPMS-method can detect biomass burning particles as well as marine aerosols or ship emissions in the atmosphere in real time, demonstrating its potential for risk assessment, source apportionment and atmospheric research. The capability to analyze the chemical´s distribution within the particle-ensemble (mixing state) paves the way to better understand relevant aerosol processes. (Passig et al. (2022) ACP 22, 1495–1514)