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Large contribution to secondary organic aerosol from isoprene cloud chemistry

Science Advances, ISSN: 2375-2548, Vol: 7, Issue: 13
2021
  • 35
    Citations
  • 0
    Usage
  • 64
    Captures
  • 4
    Mentions
  • 19
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    35
  • Captures
    64
  • Mentions
    4
    • News Mentions
      3
      • News
        3
    • Blog Mentions
      1
      • Blog
        1
  • Social Media
    19
    • Shares, Likes & Comments
      19
      • Facebook
        19

Most Recent Blog

Aerosol formation in clouds

Our experimental setup allows us for the first time to precisely investigate the distribution of organic vapours at the air-water interface under near-environmental conditions," says Houssni Lamkaddam, a researcher in the Laboratory of Atmospheric Chemistry at PSI. "With our apparatus, we can now simulate what happens in clouds.

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Aerosol formation in clouds

Researchers have explored how chemical reactions in clouds can influence the global climate. They found that isoprene, the dominant non-methane organic compound emitted into the atmosphere, can strongly contribute to the formation of organic aerosols in clouds.

Article Description

Aerosols still present the largest uncertainty in estimating anthropogenic radiative forcing. Cloud processing is potentially important for secondary organic aerosol (SOA) formation, a major aerosol component: however, laboratory experiments fail to mimic this process under atmospherically relevant conditions. We developed a wetted-wall flow reactor to simulate aqueous-phase processing of isoprene oxidation products (iOP) in cloud droplets. We find that 50 to 70% (in moles) of iOP partition into the aqueous cloud phase, where they rapidly react with OH radicals, producing SOA with a molar yield of 0.45 after cloud droplet evaporation. Integrating our experimental results into a global model, we show that clouds effectively boost the amount of SOA. We conclude that, on a global scale, cloud processing of iOP produces 6.9 Tg of SOA per year or approximately 20% of the total biogenic SOA burden and is the main source of SOA in the mid-troposphere (4 to 6 km).

Bibliographic Details

Lamkaddam, Houssni; Dommen, Josef; Ranjithkumar, Ananth; Gordon, Hamish; Wehrle, Günther; Krechmer, Jordan; Majluf, Francesca; Salionov, Daniil; Schmale, Julia; Bjelić, Saša; Carslaw, Kenneth S; El Haddad, Imad; Baltensperger, Urs

American Association for the Advancement of Science (AAAS)

Multidisciplinary

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