Investigating the role of highly oxygenated molecules (HOM) in aerosol using a newly developed box model PyCHAM

  • Shuxuan Xu

Student thesis: Phd


Highly oxygenated molecules (HOM) are crucial in the processes of secondary organic aerosol (SOA). In this thesis, two studies on HOM are carried out. The first one applies a simplified HOM scheme to PyCHAM, a newly developed box mode, to simulate alpha-pinene ozonolysis experiments in the dark environment in two different chambers, and concludes the essential role of the second-generation autoxidation. The second study develops and tests a more mechanistic HOM scheme in PyCHAM to investigate the binary system containing alpha-pinene and isoprene in terms of SOA production. These two studies can contribute to a better understanding of HOM as the precursors of SOA production. A command-line tool that can co-operate with PyCHAM is developed and used in both studies.
Date of Award31 Dec 2022
Original languageEnglish
Awarding Institution
  • The University of Manchester
SupervisorGordon Mcfiggans (Supervisor), David Topping (Supervisor) & Simon O'Meara (Supervisor)


  • isoprene
  • mixed aerosol system
  • ozonolysis
  • alpha-pinene
  • aerosol chamber model
  • box modelling
  • HOM
  • highly oxygenated molecules
  • PyCHAM

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