12:45pm - 1:00pmFR2-2: 1
Optimized Source Apportionment Using Total Carbon and Black Carbon Measurements: Integrating Multidimensional BC-Tracer and AAE Models
Martin Rigler1, Matic Ivančič1, Iasonas Stavroulas2, Eleni Liakakou3, Georgios Grivas3, Panayiotis Kalkavouras3, Nikolaos Mihalopoulos3, Lara Bubola1, Bálint Alföldy1, Gašper Lavrič1, Asta Gregorič1
1Aerosol d.o.o., Slovenia; 2Center for Atmospheric Research, University of Nova Gorica, Nova Gorica – 5000, Slovenia; 3National Observatory of Athens, Athens – 11527, Greece
A one year-long campaign (03/2024–03/2025) in Athens used the new AE36s Aethalometer and Total Carbon Analyzer to analyze carbonaceous aerosols (CA) with high-time resolution. The study applied spectral clustering and the 2D BC tracer method to differentiate sources like traffic, wildfire plumes, and mineral dust. Results showed distinct absorption fingerprints and significant secondary organic carbon (SOC) contributions in summer. These findings enhance real-time source apportionment and targeted mitigation strategies to reduce PM2.5 pollution effectively.
1:00pm - 1:15pmFR2-2: 2
Seasonal and wildfire biomass burning impact on gas-fuel heated northern European megacity: brown carbon apportionment
Marina Chichaeva1, Olga Popovicheva1, Roman Kovach1, Ying Tsai2, Evangelina Diapouli3, Nikolai Kasimov1
1Moscow State University, Russian Federation; 2Chia Nan University of Pharmacy and Science, Taiwan; 3Institute of Nuclear and Radiological Science & Technology, Energy & Safety, Greece
Multiple sources of air pollution in Moscow, no using of biomass and coal, have complicated the identifying observed BrC light absorption.Four sources obtained using BrC PMF analysis: FF combustion; BB; secondary aerosols and city dust. The uniqueness of Moscow megacity for BB impact studies in Europe and Asia is highlighted by gas-fueled heating system,and) exposure by BB emissions transported from the region around at the level similar during HP and non-HP periods. BB impact increases during spring regional agriculture and summer wildfires. Moscow is mostly affected by BrC which contribution is higher from FF combustion than from BB
1:15pm - 1:30pmFR2-2: 3
Is fossil fuel combustion still a major contributor to atmospheric aerosol carbonaceous fractions in the Po Valley? Results from a 14C-based source apportionment.
Francesca Salteri1,4, Federica Crova1, Serena Barone2, Giulia Calzolai2, Alice Forello1, Mariaelena Fedi2, Lucia Liccioli2, Dario Massabò3, Federico Mazzei3, Paolo Prati3, Gianluigi Valli1, Roberta Vecchi1, Vera Bernardoni1
1Department of Physics – Università degli Studi di Milano and INFN, Milan, Italy; 2INFN (Istituto Nazionale di Fisica Nucleare), Florence, Italy; 3Department of Physics – Università degli Studi di Genova and INFN, Genoa, Italy; 4Now at: Paul Scherrer Institute PSI, Villigen, Switzerland
We present a 14C-based source apportionment study carried out at an urban background site in the Po Valley, a hotspot area in Europe. Fourteen PM1 samples were collected in Jan-Mar 2021 in Bologna with 48-h resolution and were prepared using MISSMARPLE, a recently developed sample preparation line for 14C measurements on atmospheric aerosol carbon fractions. 14C-based source apportionment was performed separately for elemental carbon (EC) and organic carbon (OC), after suitable optimization of model parameters. Fossil fuel combustion remains the main source of EC in the investigated area (60%), while modern contributions generally dominate the OC fraction (66%)
1:30pm - 1:45pmFR2-2: 4
Novel Framework for Assessing Regional Wildfires Contributions to Biomass Burning Aerosol Optical Depth
Michalina Anna Broda1, Olga Zawadzka-Mańko1, Krzysztof Mirosław Markowicz1, Peng Xian2, Edward Hyer2
1Institute of Geophysics, University of Warsaw, Poland; 2Marine Meteorology Division, Naval Research Laboratory, U.S.
Biomass burning (BB) aerosol impacts climate and atmospheric
chemistry. To quantify BB aerosol’s contributions to aerosol optical
depth (AOD) at a given location we developed a new framework that
integrats satellite fire data with aerosol transport, BB emissions, and
plume rise models. Applying it in Warsaw (2006–2022) revealed dominant
transatlantic influences, with Canada (33%) and the USA (33%) together
surpassing European sources. Accounting for
vertical plume dynamics is crucial; neglecting them leads to biases in
source estimates. This framework can be broadly applied, though future
work should refine aerosol characterization, including plume structure,
aging, and emission inventories.
1:45pm - 2:00pmFR2-2: 5
Chloride Emissions from Post-Harvest Crop Residue Burning in the Indo-Gangetic Plains: Impacts on Ambient Chloride Concentrations in Delhi
Umer Ali1, Vikram Singh1, Anjanay Pandey1, Mohd Faisal1,2, Ajit Kumar3, Mayank Kumar3
1Department of Chemical Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India; 2Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Aargau 5232 Switzerland; 3Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India
Delhi experiences exceptionally high PM₂.₅-bound chlorine concentrations, with pronounced seasonal and diel variations, peaking in colder months and mornings due to meteorological influences like RH, temperature, and PBLH. Biomass burning, coal combustion, and industry contribute, but their relative impacts remain unclear. This study integrates Punjab field data (2023) with IIT Delhi observations (2019–2022) to assess stubble burning’s role. Elevated Cl levels in Punjab correlated with biomass-burning tracers (BC, K, OA, CO), with PMF analysis attributing 80% of Cl to stubble burning. Diagnostic ratios indicate mixed Cl sources in Delhi, including waste burning and industrial emissions.
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