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SUMMARY:When fire plumes glow in the dark: Tracing organic aerosol chemica
 l regime dominance clues via light-absorbing species - Dr. Eleni Dovrou\, 
 Technical University of Crete
DTSTART:20250527T100000Z
DTEND:20250527T110000Z
UID:TALK231850@talks.cam.ac.uk
CONTACT:Yao Ge
DESCRIPTION:Abstract: \nWildfire events have increased in frequency in rec
 ent years\, especially in regions dominated by elevated temperatures\, dry
  and windy conditions (Donahue et al.\, 2009\; Hodshire et al.\, 2019). Du
 ring such events\, the generated fire plume contains a mixture of gaseous 
 and particulate species (Figure 1)\, driving the chemical processing both 
 during the initial and aging stage (Hodshire et al.\, 2019). Organic aeros
 ols (OA) comprise a large portion of the available chemical species inside
  a fire plume and their evolution is primarily determined by two competing
  regimes (Garofalo et al.\, 2019): (1) oxidation-driven condensation and (
 2) dilution-driven evaporation. Key components of OA are light-absorbing s
 pecies (LAS)\, notably black and brown carbon. Although LAS are not a trad
 itional metric of OA chemical regime identification\, their concentrations
 \, together with key gas-phase tracers and water soluble organic carbon\, 
 provide crucial insights into the dominant in-plume chemical regime. We ev
 aluated the relationship between fuel type\, LAS levels\, and fire tracers
  to assess their connection regime prevalence. Data obtained from the 2019
  FIREX-AQ campaign (Warneke et al. 2022) were used to analyse 13 fire plum
 es across seven flights in late July and early August over the northwester
 n United States. All flights were conducted at night\, restricting the sun
 light-driven photochemistry and thus quenching rapid oxidation by hydroxyl
  radicals. Thus\, the fuel composition emerges as the primary driver of LA
 S and OA regime evolution within the fire plumes.\n\nBiography: \nDr. Elen
 i Dovrou is currently a Postdoctoral Researcher at the Technical Universit
 y of Crete in the School of Environmental and Chemical Engineering in the 
 Atmospheric Environment and Climate Change Laboratory (Voulgarakis Group).
  She is an environmental engineer with specialization in atmospheric chemi
 stry and health effects. She obtained her PhD from Harvard University (Keu
 tsch Group)\, where she focused on molecular level reactions in the tropos
 phere. Upon completion of her PhD\, in 2020\, she worked as a Postdoctoral
  Fellow at the Max Planck Institute of Chemistry (Poeschl Group) focusing 
 on laboratory and modeling studies of the effect of atmospheric reactive s
 pecies on the respiratory and circulatory system. In 2022 she obtained a P
 ostdoc position at the Foundation for Research and Technology Hellas (Pand
 is Group)\, where she worked on indoor air quality.  She has experimental\
 , field and modeling experience. Her current research focuses on understan
 ding the effect of extreme events\, and especially fires\, targeting the p
 otential chemical mechanisms that dominate and influence future air qualit
 y. Starting this fall\, she will be an Assistant Professor in Chemistry at
  the University of Crete.
LOCATION:Chemistry Dept\, Unilever Lecture Theatre and Teams
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