HOx Measurements Taken During the SOAS 2013 Campaign and Their Implications for HOx Modeling

Open Access
Feiner, Philip Allen
Area of Honors:
Bachelor of Science
Document Type:
Thesis Supervisors:
  • William Henry Brune, Thesis Supervisor
  • William Henry Brune, Honors Advisor
  • David Miller, Faculty Reader
  • Atmospheric Chemistry
  • OH
  • HO2
  • Brune
  • Feiner
  • Chemistry
  • Meteorology
  • Oxidation Chemistry
OH and HO 2, collectively referred to as HOx plays a key role in removing many pollutants from the atmosphere. Attempts to model HOx have proven to be troublesome in forested, low NOx environments as model predictions rarely match measured values. Some scientists feel that this discrepancy comes from a poor understanding of forest oxidation chemistry. Other work has presented the possibility that this discrepancy is due to an interference signal affecting HOx measurements in the field. This paper examines HOx measurements from the Southern Oxidant and Aerosol Study (SOAS) and how they compare to calculated model values. SOAS represents a low NOx environment with many supporting measurements that can be used to constrain the relevant chemistry. The results imply that we possess an adequate understanding of the isoprene oxidation chemistry and that other instruments making measurements by a similar method may be affected by an unknown interference signal.