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Isoprene forms secondary organic aerosol through cloud processing: model simulations.

Ho-Jin Lim1, Annmarie G Carlton, Barbara J Turpin

  • 1Department of Environmental Sciences, Rutgers University, 14 College Farm Road, New Brunswick, New Jersey 08901, USA.

Environmental Science & Technology
|July 29, 2005
PubMed
Summary
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In-cloud processing of isoprene forms secondary organic aerosol (SOA) by creating water-soluble aldehydes that become organic acids in cloud droplets. This process significantly contributes to global biogenic SOA production.

Area of Science:

  • Atmospheric Chemistry
  • Aerosol Science
  • Biogeochemistry

Background:

  • Isoprene is a major global non-methane volatile organic compound.
  • Homogeneous formation of secondary organic aerosol (SOA) from isoprene has been difficult to prove.
  • Understanding isoprene's role in SOA formation is crucial for climate and air quality models.

Purpose of the Study:

  • To identify and confirm an in-cloud mechanism for secondary organic aerosol (SOA) formation from isoprene.
  • To quantify the contribution of this cloud processing pathway to global SOA budgets.
  • To assess the impact of isoprene-derived SOA on aerosol properties.

Main Methods:

  • Investigated the interstitial oxidation of isoprene leading to aldehyde formation.
  • Analyzed the reaction of these aldehydes within cloud droplets to form organic acids.

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  • Observed the formation of new organic particulate matter upon cloud evaporation.

    • Main Results:

    • Identified a novel in-cloud process for SOA formation from isoprene.
    • Quantified this pathway's contribution at 1.6 Tg yr(-1) to global biogenic SOA production (8-40 Tg yr(-1)).
    • Demonstrated that cloud processing of isoprene generates hygroscopic organic aerosol.

    Conclusions:

    • Cloud processing of isoprene is a significant, previously unproven, source of secondary organic aerosol (SOA).
    • This mechanism alters the global distribution of organic aerosol.
    • Isoprene-derived SOA influences cloud condensation nuclei properties and climate.