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Condensed-phase biogenic-anthropogenic interactions with implications for cold cloud formation.

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Anthropogenic secondary organic aerosols (SOA) coatings on soot enhance ice nucleation in clouds, unlike biogenic SOA. This impacts cloud glaciation and climate, especially in mixed-phase and cirrus conditions.

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Area of Science:

  • Atmospheric Chemistry
  • Cloud Physics
  • Aerosol Science

Background:

  • Secondary organic aerosols (SOA) form from gas emissions and can coat soot particles.
  • Understanding SOA-soot interactions is crucial for cloud formation and climate modeling.

Purpose of the Study:

  • Investigate SOA-soot interactions and their impact on ice nucleation.
  • Determine the role of organic phase state in ice formation.

Main Methods:

  • Generated SOA from OH oxidation of naphthalene, α-pinene, longifolene, and isoprene.
  • Included sulfate or soot particles in experiments.
  • Estimated particle glass transition (Tg) and full deliquescence relative humidity (FDRH) using a numerical diffusion model.

Main Results:

  • Longifolene SOA particles were solid-like; biogenic SOA-sulfate mixtures formed core-shell structures.
  • Biogenic SOA (with or without sulfate) froze homogeneously.
  • α-pinene and naphthalene SOA-coated soot particles acted as ice nuclei (IN) above and below homogeneous freezing temperatures, influenced by SOA viscosity.

Conclusions:

  • Biogenic SOA has a limited role in mixed-phase cloud formation, especially with sulfate.
  • Anthropogenic SOA coatings on soot can enhance cloud glaciation in mixed-phase and cirrus conditions.