3:00pm - 3:15pmMO4-3: 1
Retrieval of aerosol physical and optical properties from in situ measurements of angular and polarization dependence of light scattering during the LUMINOUS field experiment
Martin Gysel-Beer1, Barbara Bertozzi1, Qi-Zhi Xu1, Robin L. Modini1, Claudia Mohr1, Gloria Titos2, Elena Bazo2, Andrea Casans2, Inés Zabala2, Juan Andrés Casquero-Vera2, Daniel Pérez-Ramírez2, Francisco José Olmo2, Lucas Alados-Arboledas2, Vanderlei Martins3, Fernando Rejano4, Chong Li4, David Fuertes4
1Paul Scherrer Institute, Switzerland; 2University of Granada, Spain; 3University of Maryland Batimore County, United States; 4GRASP-SAS, France
Aerosol remote sensing relies on retrieving key properties such as size distribution or single scattering albedo from measurements of the aerosol light scattering phase function (angular distribution), thereby relying on sophisticated retrieval algorithms such as GRASP. We present in situ measurements of such phase function data during using a novel Inverse Multi-Angular Polarimeters with Polarization. Measurements were taken in Granada, Spain, and a nearby mountain site in the Sierra Nevada. This provides detailed characterization of aerosol optical properties, in addition to extensive testing of GRASP retrieval results against parallel independent aerosol property measurements and remote sensing data.
3:15pm - 3:30pmMO4-3: 2
Characterisation of aerosol types from different sources using a 2D AAE approach at various European sites
Asta Gregorič1, Matic Ivančič1, Irena J. Brecelj1, Gašper Lavrič1, Balint Alföldy1, Amalia Muñoz2, Mila Ródenas2, Luca Ferrero3, Luca D'Angelo4, Martin Gysel5, Benjamin Brem5, Marco Pandolfi6, Jordi Rovira6, Nikos Mihalopoulos7, Panayiotis Kalkavouras7, Tuukka Petäjä8, Lauri Ahonen8, Tobias Hammer9, Konstantina Vasilatou9, Martin Rigler1
1Aerosol d.o.o., Slovenia; 2EUPHORE Labs., CEAM Foundation, Paterna, Valencia, Spain; 3Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milano, Italy; 4Goethe University Frankfurt am Main, Frankfurt am Main, Germany; 5Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Switzerland; 6Institute of Environmental Assessment and Water Research, CSIC, Barcelona, Spain; 7IERSD, National Observatory of Athens, Athens, Greece; 8Institute for Atmospheric and Earth System Research INAR / Physics, University of Helsinki, Finland; 9Federal Institute of Metrology METAS, Bern, Switzerland
The 9-wavelength Aethalometer AE36s (Aerosol Magee Scientific) was used to characterise aerosol type based on the absorption Ångström exponent in the long and short wavelenth range (2D AAE) across multiple European sites. Results from the 2D AAE approach revealed clear separation of different aerosol types (e.g. traffic-related BC, biomass burning, Saharan dust). This method enhances souce apportionment in urban environments, improves pollution source identification, and enables better detection of special events like Saharan dust intrusions.
3:30pm - 3:45pmMO4-3: 3
Addressing the advantages and limitations of using Aethalometer data to determine the optimal Absorption Ångström Exponents (AAEs) values for eBC source apportionment
Marjan Savadkoohi1, Mohamed Gherras2, Olivier Favez2, Jordi Rovira1, Gang I. Chen3, Philip K. Hopke4, Xavier Querol1, Andres Alastuey1, Marco Pandolfi1
1Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Spain; 2Institut national de l’environnement Industriel et des risques (INERIS), Verneuil-en-Halatte, France; 3Environmental Research Group, MRC Centre for Environment and Health, Imperial College London, London W12 0BZ, UK; 4Department of Public Health Sciences, University of Rochester, School of Medicine and Dentistry, Rochester, NY, USA
This study evaluates the Aethalometer approach for equivalent black carbon (eBC) source apportionment across 16 European sites using site-specific Absorption Ångström Exponents (AAELF and AAESF, 470–950 nm). By harmonizing eBC mass concentrations and absorption coefficients in historical and near real-time AE33 datasets, the study emphasizes the necessity of site-specific calibration over fixed AAE values. A percentile-based method effectively refines source apportionment, using summer-derived AAELF (1st percentile) to minimize brown carbon (BrC) influence and winter-derived AAESF (99th percentile) to enhance BrC detection. Despite the strong correlation with m/z 60 tracer (R² = 0.78), methodological limitations persist in high-traffic and BrC-influenced sites.
3:45pm - 4:00pmMO4-3: 4
Coating thickness and mass absorption cross-section of black carbon of fresh biomass burning emissions
Jesús Yus Díez1, Luka Drinovec1,2, Joel C. Corbin3, Jason S. Olfert4, Timothy A. Sipkens3, Alireza Moallemi3, Ginny A. Marshall5, Ran Zhao6, Jonhattan Abbatt7, Griša Močnik1,2
1University of Nova Gorica, Slovenia; 2Haze instruments d.o.o, 1000 Ljubljana, Slovenia; 3Metrology Research Centre, National Research Council of Canada, Ottawa, ON K1A 0R6, Canada; 4Department of Mechanical Engineering, University of Alberta, Edmonton, Canada; 5Natural Resources Canada—Canadian Forest Service, Northern Forestry Centre, Edmonton, Canada; 6Department of Chemistry, University of Albert, Edmonton, Alberta, Canada; 7Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
In this study we present the results from a laboratory campaign that took place in summer 2024 at the Northern Forestry Center in Edmonton, Canada, where we performed biomass burning experiments to analyze their coathing thickness and mass absorption cross-section properties. To this end, we performed over 40 controlled burns over fuel types characteristic of Canadian wildfires and domestic heating were burned, including, grass, ponderosa pine, peat, mulch and mixtures mulch with peat. To measure their coating thickness we used a CPMA-SP2 tandem configuration, and for measuring the aerosol particles absorption we used a PTTAM-2λ.
4:00pm - 4:15pmMO4-3: 5
Effects of photochemical and dark aging on the light absorbing properties of Eurasian boreal forest fire aerosol emissions
Tuukka Kokkola1, Snehitha Kommula2, Liqing Hao2, Markus Somero1, Muhammad Shahzaib1, Mika Ihalainen1, Anni Hartikainen1, Kajar Köster1, Annele Virtanen2, Olli Sippula1,3
1Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, 70211, Finland; 2Department of Technical Physics, University of Eastern Finland, Kuopio, 70211, Finland; 3Department of Chemistry, University of Eastern Finland, Joensuu, 80101, Finland
Warming in the Arctic can be exacerbated by light absorbing particles, i.e. black and brown carbon (BC and BrC) originating from near-Arctic biomass burning sources.The projected rise in boreal fires driven by climate change will likely enhance the deposition of light absorbing particles onto the Arctic. Aerosol emission characteristics from Eurasian boreal fires present important gaps in knowledge, and the atmospheric transformations of those particles may induce changes in the radiative properties that are not fully constrained. In this work, the effects of combustion conditions and atmospheric aging on the light absorbing particles from boreal forest surface fires were studied.
4:15pm - 4:30pmMO4-3: 6
Light absorbing and scattering properties of freshly emitted, aged, and secondary formed wood combustion aerosols
Balint Alfoldy1, Asta Gregorič1,2, Matic Ivančič1, Irena Ježek Brecelj1, Mila Rodenas3, Esther Borras3, Ruben Soler3, Teresa Vera3, Amalia Munoz3, Eduardo Yubero4, Javier Crespo4, Martin Rigler1
1Aerosol d.o.o., Ljubljana, SI-1000, Slovenia; 2Center for Atmospheric Research, University of Nova Gorica, Ajdovščina, Slovenia; 3EUPHORE Labs., CEAM Foundation, Paterna, Valencia, Spain; 4Atmospheric Pollution Laboratory (LCA-UMH), Miguel Hernández University, Elche, 03202, Spain
Particulate matter from wood combustion has a significant impact on climate and human health. Black carbon and freshly emitted brown carbon are strong light absorbers. During aging, the particles become less absorbing, or some originally colorless particles become light-absorbing. The secondary formed particles also modify the optical properties of the original emission.
Aerosol sample from wood combustion was measured with the new Aethalometer (AE36s), which has spectral resolution of nine wavelengths. The measurements were performed in the simulation chamber of the CEAM-EUPHORE research center in Valencia, Spain. Flaming and smoldering burning conditions were separately investigated and compared to diesel emission.
|
