The effect of temperature and relative humidity on secondary organic aerosol formation from ozonolysis of Δ3-careneElectronic supplementary information (ESI) available: Placement and sampling cycles of instruments, wall-loss correction, experimental details, background concentration of sulfuric acid, evolution in moderately oxygenated species, details of the offline analysis, time-evolution plots of ozonolysis products (PDF). See DOI: https://doi.org/10.1039/d3ea00128h
In: Environmental Science: Atmospheres, Jg. 4 (2024), Heft 1, S. 88-103
Online
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Zugriff:
This study investigates the effects of temperature and relative humidity (RH) on the formation of secondary organic aerosol (SOA) from Δ3-carene, a prevalent monoterpene in boreal forests. Dark ozonolysis experiments of 10 ppb Δ3-carene were conducted in the Aarhus University Research on Aerosol (AURA) atmospheric simulation chamber at temperatures of 0, 10, and 20 °C. Under dry conditions (RH < 2%), the SOA formation in terms of both particle number and mass concentration shows minimal temperature dependence. This is in contrast to previous findings at higher initial concentrations and suggests an effect of VOC loading for Δ3-carene. Interestingly, the mass fraction of key oxidation products (cis-3-caric acid, cis-3-caronic acid) exhibit a temperature dependence suggesting continuous condensation at lower temperatures, while evaporation and further reactions over time become more favourable at higher temperatures. The oxygen-to-carbon ratios in the particle phase and the occurrence of highly oxygenated organic molecules (HOM) in the gas phase show modest increases with higher temperatures. Predictions from the Aerosol Dynamics and Gas- and Particle-Phase Chemistry Kinetic Multilayer Model (ADCHAM) agrees with the experimental results regarding both physical particle properties and aerosol composition considering the experimental uncertainties. At high RH (∼80%, 10 °C), a considerable increase in the particle nucleation rate and particle number concentration is observed compared to experiments under dry conditions. This is likely due to enhanced particle nucleation resulting from more stable cluster formation of water and inorganics at increased RH. However, RH does not affect the particle mass concentration.
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The effect of temperature and relative humidity on secondary organic aerosol formation from ozonolysis of Δ3-careneElectronic supplementary information (ESI) available: Placement and sampling cycles of instruments, wall-loss correction, experimental details, background concentration of sulfuric acid, evolution in moderately oxygenated species, details of the offline analysis, time-evolution plots of ozonolysis products (PDF). See DOI: https://doi.org/10.1039/d3ea00128h
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Autor/in / Beteiligte Person: | Thomsen, Ditte ; Iversen, Emil Mark ; Skønager, Jane Tygesen ; Luo, Yuanyuan ; Li, Linjie ; Roldin, Pontus ; Priestley, Michael ; Pedersen, Henrik B. ; Hallquist, Mattias ; Ehn, Mikael ; Bilde, Merete ; Glasius, Marianne |
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Zeitschrift: | Environmental Science: Atmospheres, Jg. 4 (2024), Heft 1, S. 88-103 |
Veröffentlichung: | 2024 |
Medientyp: | serialPeriodical |
ISSN: | 2634-3606 (print) |
DOI: | 10.1039/d3ea00128h |
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