Molecular Understanding of the Enhancement in Organic Aerosol Mass at High Relative Humidity.
molecular composition
organic aerosol growth
particle diffusivity
particle water content
relative humidity
Journal
Environmental science & technology
ISSN: 1520-5851
Titre abrégé: Environ Sci Technol
Pays: United States
ID NLM: 0213155
Informations de publication
Date de publication:
14 02 2023
14 02 2023
Historique:
pmc-release:
30
01
2024
pubmed:
31
1
2023
medline:
16
2
2023
entrez:
30
1
2023
Statut:
ppublish
Résumé
The mechanistic pathway by which high relative humidity (RH) affects gas-particle partitioning remains poorly understood, although many studies report increased secondary organic aerosol (SOA) yields at high RH. Here, we use real-time, molecular measurements of both the gas and particle phase to provide a mechanistic understanding of the effect of RH on the partitioning of biogenic oxidized organic molecules (from α-pinene and isoprene) at low temperatures (243 and 263 K) at the CLOUD chamber at CERN. We observe increases in SOA mass of 45 and 85% with increasing RH from 10-20 to 60-80% at 243 and 263 K, respectively, and attribute it to the increased partitioning of semi-volatile compounds. At 263 K, we measure an increase of a factor 2-4 in the concentration of C
Identifiants
pubmed: 36716278
doi: 10.1021/acs.est.2c04587
pmc: PMC9933880
doi:
Substances chimiques
Monoterpenes
0
Air Pollutants
0
Aerosols
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
2297-2309Références
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