11:30am - 11:45amMO2-4: 1
The impact of particle size on the light absorption of wildfire-like brown carbon emissions from wood combustion
Constantinos Moularas1,2, Irini Tsiodra3, Nikos Mihalopoulos3,4, Philip Demokritou1, Georgios A. Kelesidis1,2
1Environmental and Occupation Health Science Institute, School of Public Health, Rutgers University, Piscataway, 08854 NJ, USA; 2Faculty of Aerospace Engineering, Delft University of Technology, Delft, 2629 HS, The Netherlands; 3Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Athens, 15236, Greece; 4Department of Chemistry, University of Crete, Heraklion, 71003, Greece
Here, the light absorption of wildfire-like Brown Carbon (BrC) emitted by wood combustion is elucidated using an integrated generation platform coupled with a real-time monitoring and time-integrated sampling instrumentation. The optical properties and particle size distribution of Brown Carbon (BrC) are controlled by varying the wood mass. The size fractionation of such wildfire-like BrC reveals that the PM0.1-2.5 fraction absorbs up to five times more light compared to the PM0.1 fraction. The size-resolved optical properties of BrC measured here can be interfaced with climate models to determine the contribution of wildfire PM to global warming.
11:45am - 12:00pmMO2-4: 2
Optical properties of particle emissions from a wood stove: How do particle filtration and atmospheric aging influence the radiative forcing of emissions?
Olli Sippula1, Arya Mukherjee1, Satish Basnet1, Andreas Paul2, Aki Virkkula3, Anni Hartikainen1, Pasi Yli-Pirilä1, Tuukka Kokkola1, Markus Somero1, Juho Louhisalmi1, Jarkko Tissari1, Jani Leskinen1, Hendryk Czech4, Yinon Rudich5, Thorsten Hohaus2, Ralf Zimmermann4, Mika Ihalainen1
1University of Eastern Finland, Finland; 2IEK-8 Troposhere, Forschungszentrum Jülich GmbH; 3Atmospheric Composition Research, Finnish Meteorological Institute; 4Joint Mass Spectrometry Center, Analytical Chemistry, University of Rostock; 5Department of Earth and Planetary Science, Weizmann Institute of Science
Residential wood combustion (RWC) is a major source of light-absorbing particles into atmosphere. This study investigated how RWC aerosol optical properties are influenced by combustion conditions, novel emission control techniques and atmospheric aging. We found that an electrostatic precipitator (ESP) removed 71% of particle emissions, but considerably changed the particle size and composition, leading to increase in radiative forcing efficiency of the particles. Photochemical aging of emissions strongly decreased radiative forcing efficiency, but the particles still estimated cause a net warming effect. The results can be used to assess how efficiently new emission control technologies mitigate climate impacts of RWC.
12:00pm - 12:15pmMO2-4: 3
Aerosol emissions from biomass combustion: The effects of ventilation degree and oxygen concentration on PAH emissions
Johannes Rex1, Evalyne Arinaitwe2, Eliza Cwalina1, Konrad Wilkens2, Bo Strandberg3, Vilhelm Malmborg1, Joakim Pagels1
1Ergonomics and Aerosol Technology, Lund University, Sweden; 2Fire Safety Engineering, Lund University, Sweden; 3Occupational and Environmental Medicine, Lund University, Sweden
Aerosol emissions, including polycyclic aromatic hydrocarbons (PAHs), from biomass combustion are extremely difficult to predict and to reproduce due to their complex nature and high sensitivity to the combustion conditions.
This study aimed to characterize fire emissions from commonly used wood-based construction materials during key combustion conditions, including well-ventilated, under-ventilated, and vitiated (reduced oxygen by nitrogen dilution) conditions with non-flaming smoldering combustion.
The results show that particle-phase PAH emissions were substantially increased with decreasing degree of ventilation. On the other hand, vitiated conditions did not result in similar PAH-rich emissions under the same heating conditions.
12:15pm - 12:30pmMO2-4: 4
Condensable Particulate Matter Formation at Different Atmospheric Pollutant Conditions
Geun-wu Ryu1, Jeongbeen Kim1, Changhyuk Kim1,2
1School of Civil and Environmental Engineering, Pusan National University, Busan, Republic of (South Korea); 2Institute for Environment and Energy, Pusan National University, Busan, Republic of (South Korea)
Condensable particulate matter (CPM) is a subset of primary particulate matter, formed through rapid condensation of vapors emitted from stacks to the atmosphere. CPM promotes new particle formation through homogeneous nucleation and particle growth through heterogeneous nucleation/condensation on the surface of filterable particulate matter (FPM). The effect of pre-existing particles and gaseous air pollutants around the stacks on the heterogeneous CPM formation has not been well understood. In this study, the effects of pre-existing particles and gaseous pollutants on the formation of heterogeneous CPM were investigated using the real-time CPM measurement system, PNU-CPM, developed by Pusan National University.
|
