When fire plumes glow in the dark: Tracing organic aerosol chemical regime dominance clues via light-absorbing species

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• Dr. Eleni Dovrou, Technical University of Crete
• Tuesday 27 May 2025, 11:00-12:00
• Chemistry Dept, Unilever Lecture Theatre and Teams.

If you have a question about this talk, please contact Yao Ge.

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Abstract: Wildfire events have increased in frequency in recent years, especially in regions dominated by elevated temperatures, dry and windy conditions (Donahue et al., 2009; Hodshire et al., 2019). During 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 aerosols (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 species (LAS), notably black and brown carbon. Although LAS are not a traditional 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 evaluated 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 plumes across seven flights in late July and early August over the northwestern United States. All flights were conducted at night, restricting the sunlight-driven photochemistry and thus quenching rapid oxidation by hydroxyl radicals. Thus, the fuel composition emerges as the primary driver of LAS and OA regime evolution within the fire plumes.

Biography: Dr. Eleni Dovrou is currently a Postdoctoral Researcher at the Technical University 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 chemistry and health effects. She obtained her PhD from Harvard University (Keutsch Group), where she focused on molecular level reactions in the troposphere. 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 species on the respiratory and circulatory system. In 2022 she obtained a Postdoc position at the Foundation for Research and Technology Hellas (Pandis Group), where she worked on indoor air quality. She has experimental, field and modeling experience. Her current research focuses on understanding the effect of extreme events, and especially fires, targeting the potential chemical mechanisms that dominate and influence future air quality. Starting this fall, she will be an Assistant Professor in Chemistry at the University of Crete.

This talk is part of the Centre for Atmospheric Science seminars, Chemistry Dept. series.

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