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The effect of tempe...
The effect of temperature and relative humidity on secondary organic aerosol formation from ozonolysis of Δ3-carene
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- Thomsen, Ditte (author)
- Aarhus University
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- Iversen, Emil Mark (author)
- Aarhus University
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- Skønager, Jane Tygesen (author)
- Aarhus University
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- Luo, Yuanyuan (author)
- University of Helsinki
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- Li, Linjie (author)
- University of Gothenburg,Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology
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- Roldin, Pontus (author)
- Lund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,LTH profilområde: Aerosoler,LTH profilområden,Centre for Environmental and Climate Science (CEC),Faculty of Science,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Aerosols,LTH Profile areas,Faculty of Engineering, LTH,IVL Swedish Environmental Research Institute
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- Priestley, Michael (author)
- University of Gothenburg,Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,IVL Swedish Environmental Research Institute
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- Pedersen, Henrik B. (author)
- Aarhus University
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- Hallquist, Mattias, 1969 (author)
- University of Gothenburg,Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology
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- Ehn, Mikael (author)
- University of Helsinki
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- Bilde, Merete (author)
- Aarhus University
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- Glasius, Marianne (author)
- Aarhus University
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Environmental Science: Atmospheres. - 2634-3606. ; 4:1, s. 88-103
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
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- ref (subject category)
- art (subject category)
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- By the author/editor
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Thomsen, Ditte
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Iversen, Emil Ma ...
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Skønager, Jane T ...
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Luo, Yuanyuan
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Li, Linjie
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Roldin, Pontus
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show more...
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Priestley, Micha ...
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Pedersen, Henrik ...
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Hallquist, Matti ...
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Ehn, Mikael
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Bilde, Merete
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Glasius, Mariann ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
- Articles in the publication
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Environmental Sc ...
- By the university
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University of Gothenburg
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Lund University