10:15am - 10:30amWE1-1: 1
Impact of Heat Waves on Isoprene and Terpene Concentrations: A case study from National Atmospheric Košetice Observatory
Jan Pacner, Michal Sanetrník, Adéla Holubová
CHMI, Czech Republic
Heatwaves (HWs) increase air pollution by boosting biogenic volatile organic compound (BVOC) emissions, including isoprene. At the National Atmospheric Observatory Košetice, isoprene concentrations during HWs (1995–2023) were significantly higher than on regular days. Correlation analysis showed stronger links between isoprene and temperature during HWs.
10:30am - 10:45amWE1-1: 2
Changing peatlands: effects on aerosol formation potential
Angela Buchholz1, Iida Pullinen1, Aino Korrensalo2,3, Oksana Skaldina2, Elisa Männistö4, Annele Virtanen1
1Department of Technical Physics, University of Eastern Finland, Finland; 2Department of Environmental and Biological Sciences, University of Eastern Finland, Finland; 3Natural Resources Institute Finland (Luke), Finland; 4School of Forest Sciences, University of Eastern Finland, Finland
Peatlands cover a large fraction of the boreal climate zone and are very sensitive to the warming climate which can lead to drying and vegetation change. We investigated how the change from sedge-dominated fen to a shrub-dominated bog affects the secondary organic aerosol (SOA) formation potential of the emitted volatile organic compound (VOC). While the fen case had higher VOC emissions, the SOA formation potential was lower than for the bog one. Isoprene suppressed SOA formation in the fen case but had little effect on the bog case showing the complex interactions of precursors.
10:45am - 11:00amWE1-1: 3
BIOMASP+: Tackling the biosphere-atmosphere exchanges and their impact on secondary air pollution in an emblematic subtropical megacity - São Paulo, Brazil
Adalgiza Fornaro1, Agnes Borbon2, Silvia Ribeiro Souza3, Amauri Pereira Oliveira1, Joel Brito4, Jean Luc Jaffrezo5, Michael Staudt6, Rita Yuri Ynoue1, Samara Carbone7, Lucas Covre Chiari1, Etienne Brugere2, Pauline Fombelle2, Olatunde Murana4, Luciana Rizzo1, Jean Eudes Petit8, Pamela Dominutti5, Junteng Wu2
1University of São Paulo (IAG-USP, IF-USP), Brazil; 2Univ. Clermont Auvergne, CNRS, LaMP, OPGC, France; 3Núcleo de Uso Sustentável dos Recursos Naturais, Instituto de Pesquisas Ambientais (IPA-SP), Brasil; 4IMT Nord Europe, Institut Mines-Télécom, Univ. Lille, France; 5Univ. Grenoble Alpes, CNRS, INRAE, IRD, IGE, France; 6CEFE, CNRS, EPHE, IRD, Univ Montpellier, Montpellier, France; 7Universidade Federal de Uberlândia (UFU), Brazil; 8Laboratoire des Sciences du Climat et de l’Environnement, CEA, CNRS, Gif sur Yvette, France
The Metropolitan Area of São Paulo (MASP), in southeastern Brazil, is one of the world’s largest megacities, with a population exceeding 20 million and a fleet of approximately 7 million vehicles. While many pollutants have shown a strong decline over the last 20 years, PM2.5 levels have remained relatively stable (15 μg.m-³) and ozone concentrations have increased slightly. By taking the subtropical MASP as a natural laboratory, the BIOMASP+ project (BIOsphere-atmosphere interactions in the Metropolitan Area of São Paulo - plus) aims to evaluate how biosphere-atmosphere exchanges affect secondary urban pollution and the biosphere in the context of climate change.
11:00am - 11:15amWE1-1: 4
Secondary organic aerosol (SOA) formation from strong isoprene emitter species of Atlantic Forest, Southeastern Brazil, under ozone stress
Pauline Fombelle1, Junteng WU1, Manon Rocco2,9, Alex do Nascimento3, Olatunde Murana4, Alexandre Albinet5, Samara Carbone6, Luciana Rizzo7, Joel de Brito4, Adalgiza Fornaro2, Silvia Ribeiro Souza3, Jean-Eudes Petit8, Agnès Borbon1
1Université Clermont Auvergne, CNRS, OPGC, LaMP, F-63000 Clermont Ferrand, France; 2Institute of Astronomy, Geophysics and Atmospheric Sciences, USP, São Paulo, 05508-090, Brazil; 3Instituto de Pesquisas Ambientais de São Paulo, Núcleo de Uso Sustentável e Recursos Naturais, São Paulo, 09560-500, Brazil; 4Centre for Energy and Environment, IMT Nord Europe, Université de Lille, Lille, 59000, France; 5INERIS, Parc Technologique Alata, Verneuil en Halatte, 60550, France; 6Institute of Agricultural Sciences, Federal University of Uberlândia, Uberlândia, 38410-337, Brazil; 7Institute of Physics, Universidade de Sao Paulo, São Paulo, 05508-090, Brazil; 8Laboratoire des Sciences du Climat et de l’Environnement, Gif-sur-Yvette, 91191, France; 9Aix Marseille Univ, CNRS, LCE and IMBE, CNRS, Univ. Aix-Marseille, 13000, Marseille, France
This study, part of the BIOMASP+ project, explores biogenic secondary organic aerosol (SOA) formation from Cassaeria Sylvestris (CS) under oxidative stress. Under controlled chamber conditions, plants were exposed to ozone, and emissions were analyzed with advanced aerosol and mass spectrometry techniques. Results show CS emissions, primarily isoprene, significantly enhance organic aerosol mass, indicating strong oxidation potential. The impact of ozone stress on CS plants emissions and SOA potential is also illustrated in this work, which will be discussed to better understand BVOC oxidation mechanisms, SOA formation, their role in urban air quality and local climate.
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