Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

 
 
Presentations including 'Asmi'

PO1: 169

Continental river runoff over the Arctic Ocean enhances atmospheric aerosol formation

James Brean1, Cedric Fichot2, David Beddows1, Douglas Worsnop3,4, Zongbo Shi1, Roy Harrison1, Eija Asmi5, Manuel Dallosto6

1University of Birmingham, UK; 2Boston University, USA; 3Aerodyne Research Inc., Billerica, Massachusetts 01821, USA; 4University of Helsinki, Helsinki, 00014, Finland; 5FMI, Finland; 6ICM CSIC, Spain

The warming Arctic climate is highly sensitive to the presence of cloud condensation nuclei (CCN). A major source of Arctic CCN is New Particle Formation (NPF), however, the sources of vapours driving NPF are still unclear. The Arctic Ocean—the smallest and shallowest of the world's oceans—receives approximately 10% of global river runoff, which is rich in terrigenous dissolved organic matter (tDOM). Here, we explore the association between a 9-year (2010-2018) record of atmospheric aerosol size distributions taken at Tiksi (Russia) and its overlap with air mass trajectories analysis combined with ocean remote sensing data.

Session Details:

Poster Session Monday
Time: 01/Sept/2025: 5:15pm-6:45pm · Location: Studium2000 Building5

 
EAC2025_PO1-169_821_Brean.pdf

PO2: 169

Challenges in interpreting black carbon data from national air quality monitoring in the UK

Krzysztof Ciupek1, David Butterfield1, Gyanesh Singh1, David C. Green2, Anja H. Tremper2, Max Priestman2, Eija Asmi3, Griša Močnik4, Konstantina Vasilatou5, Tobias Hammer5, Thomas Müller6, Joel Corbin7, Alejandro Keller8, Konstantinos Eleftheriadis9, Jorge Saturno10

1Air Quality and Aerosol Metrology Group, National Physical Laboratory, United Kingdom; 2Environment Research Group, Imperial College London, United Kingdom; 3Finnish Meteorological Institute, Finland; 4Department of Environmental Sciences, Jozef Stefan Institute, Slovenia; 5Laboratory Particles and Aerosols, Federal Institute of Metrology METAS, Switzerland; 6Leibniz Institute for Tropospheric Research, Germany; 7Metrology Research Centre, National Research Council Canada, Canada; 8Institute of Aerosol and Sensor Technology, FHNW, Switzerland; 9Institute of Nuclear Technology and Radiation, NCSR Demokritos, Greece; 10Physikalisch-Technische Bundesanstalt, Germany

Various air quality monitoring networks assess black carbon (BC) levels as part of their national policies and provide evidence for effectiveness of the mitigation strategies. However, interpreting BC data encounters several challenges, ranging from instrumentation discrepancies to methodological variations. Examples of such networks are the UK’s Particle Concentration & Numbers (PCN) and Black Carbon (BC) Networks, which has expanded in 2024 from 14 to 26 sites with another seven sites to be installed. We will present an overview of the most recent data from the BC Network data together with highlighting and addressing challenges in their interpretation.

Session Details:

Poster Session Tuesday
Time: 02/Sept/2025: 5:15pm-6:45pm · Location: Studium2000 Building5

 
EAC2025_PO2-169_909_Ciupek.pdf

11:30am - 11:45am
TH2-3: 1

The roadmap to a European standard for aerosol light absorption

Jorge Saturno1, Eija Asmi2, John Backman2, Krzysztof Ciupek3, Joel Corbin4, Luka Drinovec5,6, Konstantinos Eleftheriadis7, Maria Gini7, Tobias Hammer8, Alejandro Keller9, Griša Močnik5,6,10, Thomas Müller11, Andreas Nowak1, Arun Babu Suja11, Konstantina Vasilatou8, Ernest Weingartner9

1Physikalisch-Technische Bundesanstalt, Germany; 2Finnish Meteorological Institute, Helsinki, Finland; 3National Physical Laboratory, Teddington, UK; 4National Research Council, Ottawa, Canada; 5Center for Atmospheric Research, University of Nova Gorica, Nova Gorica, Slovenia; 6Haze Instruments d.o.o., Ljubljana, Slovenia; 7National Centre of Scientific Research “Demokritos”, Attiki, Greece; 8Federal Institute of Metrology METAS, Berne-Wabern, Switzerland; 9Institute for Sensors and Electronics, FHNW, Windisch, Switzerland; 10Jozef Stefan Institute, Ljubljana, Slovenia; 11Department of Atmospheric Microphysics, TROPOS, Leipzig, Germany

We present a roadmap for providing standardised BC measurements, which follows a top-down approach, beginning with SI-traceable measurements of the aerosol absorption coefficient (babs) using in-situ reference methods with a target measurement uncertainty of ≤ 10 % (coverage factor k=2). Two measurement workshops have been successfully conducted, providing essential data to achieve the research goals: 1) two primary reference methods for aerosol light absorption have been tested and validated; these include photo-thermal interferometry and extinction-minus-scattering for at least two different wavelengths. 2) MACBC has been determined for different aerosol mixtures including bare BC, coated BC and externally mixed BC.

Session Details:

WG3: Optical aerosol measurement techniques
Time: 04/Sept/2025: 11:30am-12:30pm · Location: Room Caravaggio

 
EAC2025_TH2-3-1_873_Saturno.pdf

PO3: 7

Review of the mass absorption cross-section literature for mixed atmospheric black carbon

Eija Asmi1, Joel Corbin2, John Backman1, Konstantina Vasilatou3, Ernest Weingartner4, Krzysztof Ciupek5, Thomas Müller6, Arun Babu Suja6, Griša Močnik7,8,9, Luka Drinovec7,8, Kostas Eleftheriadis10, Jorge Saturno11

1Finnish Meteorological Institute, Finland; 2Metrology Research Centre, National Research Council Canada, Ottawa, Canada; 3Laboratory Particles and Aerosols, Federal Institute of Metrology METAS, Bern, 3003, Switzerland; 4University of Applied Sciences and Arts Northwestern Switzerland, CH-5210 Windisch, Switzerland; 5Air Quality and Aerosol Metrology Group, National Physical Laboratory, Teddington, TW11 0LW, UK; 6Atmospheric Microphysics Department, Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany; 7Center for Atmospheric Research, University of Nova Gorica, Nova Gorica, 5270, Slovenia; 8Haze Instruments d.o.o., Ljubljana, 1000, Slovenia; 9Department of Environmental Sciences, Jozef Stefan Institute, Ljubljana, 1000, Slovenia; 10Institute of Nuclear Technology and Radiation, NCSR Demokritos, Paraskevi, Attiki, 15310, Greece; 11Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany

We compile more than 200 MACBC values from 63 studies and explore the effects of sampling location, study duration, instrumentation (photometers, photoacoustic; mass concentration (CBC) from thermal-optical analysis, or SP2), measurement wavelength, thermal–optical protocol. The data show that photoacoustic measurements of MACBC were consistently higher in remote relative to urban environments, indicating Eabs>1 in remote environments, as expected. This trend was not evident for filter-based measurements, and few other clear trends could be identified in general. Notably, wavelength-dependent trends were not evident. Our results do not support the use of simplistic generalizations or assumptions about MACBC in the atmosphere.

Session Details:

Poster Session Thursday
Time: 04/Sept/2025: 5:15pm-6:45pm · Location: Studium2000 Building5

 
EAC2025_PO3-7_1007_Asmi.pdf

PO3: 76

Comparison of the Four-Wavelength Photoacoustic Spectrometer PAAS-4λ and Aethalometer AE33 for Long-Term Measurements in Rural Northern and Southern Finland

F. Martin Schnaiter1,2, Emma Järvinen1, Henri Servomaa3, Eija Asmi3, Antti-Pekka Hyvärinen3, Rostislav Kouznetsov3, Mikhail Sofiev3, Aki Virkkula3, Krista Luoma3, Yutaka Kondo4, Lauri Ahonen5, Sujai Banerji5, Tapio Elomaa5, Tuukka Petäjä5

1University of Wuppertal, Germany; 2schnaiTEC GmbH, Wuppertal, Germany; 3Finnish Meteorological Institute, Helsinki, Finland; 4University of Tokyo, Japan; 5University of Helsinki, Finland

This study presents long-term measurements of light absorption by atmospheric black carbon (BC) in Northern and Southern Finland, using the PAAS-4λ four-wavelength photoacoustic aerosol absorption spectrometer. The data were compared with MAAP and Aethalometer AE33 measurements to evaluate their accuracy in determining BC mass concentrations (eBC). The study identifies periods influenced by long-range transported combustion aerosols and investigates the variability of the Aethalometer multi-scattering correction factor, C, and its relation to source regions. Further analysis explores BC’s mixing state using light scattering and single scattering albedo (SSA). These findings enhance understanding of BC’s impact on the Arctic climate.

Session Details:

Poster Session Thursday
Time: 04/Sept/2025: 5:15pm-6:45pm · Location: Studium2000 Building5

 
EAC2025_PO3-76_606_Schnaiter.pdf

PO3: 96

Particulate air pollution in the heart of the European Union: lessons learned from SAFICA 2017-2018 and SAAERO 2022-2023 projects

Katja Dzepina1, Vaios Moschos1,19, Anna Tobler1,2, Francesco Canonaco1,2, Manousos Manousakas1,3, Michael Bauer1, Peeyush Khare1, Levi Folghera1, Yufang Hao1, Jasna Huremovic4, Sabina Zero4, Almir Bijedic5, Enis Omercic5, Enis Krecinic5, Damir Smajic5, Ismira Ahmovic5, Sanela Salihagic6, Adnan Masic7, Gordana Pehnec8, Ranka Godec8, Ivana Jakovljevic8, Silva Zuzul8, Jasmina Rinkovec8, Ivan Beslic8, Anne Kasper-Giebl9, Sanja Frka10, Ana Cvitesic-Kusan10, Jean-Luc Jaffrezo11, Gaelle Uzu11, Sonke Szidat12, Dragana Djordjevic13, Jelena Djuricic-Milankovic14, Sofija Miljkovic13, Kristina Glojek15,21, Petra Makoric15, Marta Via15, Asta Gregoric15,16, Martin Rigler16, Matic Ivancic16, Janja Vaupotic17, Leah Williams18, Philip Croteau18, John Jayne18, Sarath Guttikunda20, Kaspar Dallenbach1, Jay Slowik1, Imad El Haddad1, Grisa Mocnik15, Andre Prevot1

1Paul Scherrer Institute, Switzerland; 2Datalystica Ltd., Switzerland; 3National Centre of Scientific Research “Demokritos”, Greece; 4Faculty of Science, University of Sarajevo, Bosnia and Herzegovina; 5Federal Hydrometeorological Institute of Bosnia and Herzegovina, Sarajevo, Bosnia and Herzegovina; 6Institute for Public Health of the Sarajevo Canton, Bosnia and Herzegovina; 7Mechanical Engineering Faculty, University of Sarajevo, Bosnia and Herzegovina; 8Institute for Medical Research and Occupational Health, Zagreb, Croatia; 9Technical University of Vienna, Austria; 10Rudjer Boskovic Institute, Zagreb, Croatia; 11Institute for Environmental Geosciences, Grenoble, France; 12University of Bern, Switzerland; 13University of Belgrade, Serbia; 14Academy of Applied Studies Šabac, Serbia; 15University of Nova Gorica, Slovenia; 16Aerosol d.o.o., Ljubljana, Slovenia; 17Jozef Stefan Institute, Ljubljana, Slovenia; 18Aerodyne Research, Inc., Billerica, MA, United States of America; 19University of North Carolina at Chapel Hill, NC, United States of America; 20Urban Emissions, New Delhi, India; 21Institute of Environmental Assessment and Water Research, Barcelona, Spain

Particularly during winter, urban areas of the Southeast Europe (SEE) are experiencing some of the poorest air quality globally. It imperative to understand SEE urban air pollution, 1st locally (emission sources, processing, and the adverse health effects) and 2nd regionally (transboundary outflow). This presentation will give the results of two major projects centered at supersite in Sarajevo, Bosnia and Herzegovina (BiH). Sarajevo, BiH is an excellent case study for the SEE urban air pollution: it is situated in a basin surrounded by mountains, and during cold winter months, topography and meteorology cause trapping of the pollutants in its basin.

Session Details:

Poster Session Thursday
Time: 04/Sept/2025: 5:15pm-6:45pm · Location: Studium2000 Building5

 
EAC2025_PO3-96_581_Dzepina.pdf