11:30am - 11:45amTU2-5: 1
Interactions between air pollution and fog formation in the Po Valley: perspectives from intensive field studies and long-term monitoring
Stefano Decesari1, Karam Mansour1, Matteo Rinaldi1, Marco Paglione1, Almuth Neuberger2, Paul Christoph Zieger2, Ilona Riipinen2, Jorma Joutsensaari3, Sami Romakkaniemi4, Sandro Fuzzi1
1Institute of Atmospheric Sciences and Climate, National Research Council of Italy (CNR-ISAC), Italy; 2Department of Environmental Science, Stockholm University, Sweden; 3Department of Technical Physics, Faculty of Science, Forestry and Technology, University of Eastern Finland, Finland; 4Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute (FMI), Finland
Detailed observations of aerosol-fog microphysics were carried out at the rural station of San Pietro Capofiume (SPC) in 2021-2022 in the Po Valley, one of the major pollution hotspots in Europe, in the frame of the Fog and Aerosol Interaction Research Italy (FAIRARI) field experiment. The results support the key role of aerosol size distribution in determining activation into fog in this environment. Moreover, continuous measurements of fog liquid water content (LWC) were performed since 1991 every winter allowing the analysis of long-term trends in fog properties.
11:45am - 12:00pmTU2-5: 2
From Pre-Cloud to Cloud Formation: Real-Time Characterization of Cloud Residuals and VOCs in Southeast China
Yi Zhang1,2, Mikael Ehn3, Yele Sun1,2
1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 3Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki 00140, Finland
A field campaign in a mountaintop station of southeastern China used a GCVI and ToF-ACSM to study cloud particle composition. Organic dominated (~60%) across cloud residuals (Res), interstitials (Int), and ambient particles (Amb). Sulfate and ammonium had highest scavenging efficiencies (>60%), while nitrate was enriched in cloud droplets (9.2% higher in Res than Amb). Aromatic hydrocarbons increased during cloud formation, with C₈ aromatics surging 5.95 times on average. Anthropogenic emissions led to larger cloud droplet size. Organic oxidation decreased with increasing organic fraction, highlighting the role of in-cloud aqueous-phase reactions in altering orxidation degree of organic compounds.
12:00pm - 12:15pmTU2-5: 3
Investigating the role of isoprene cloud processing in SOA formation during deep convective events
Francesca Salteri1, Anouck Chassaing2,3, Wei Huang1, Chen Yang4,5, Imad El Haddad1, Ilona Riipinen2,3, Thorsten Bartels-Rausch1, Claudia Mohr1,6
1PSI Center for Energy and Environmental Sciences, 5232 Villigen PSI, Switzerland; 2Department of Environmental Sciences (ACES), Stockholm University, Stockholm, 11418, Sweden; 3Bolin Centre for Climate Research, Stockholm University, Stockholm, 114 18, Sweden; 4Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki, Helsinki, 00014, Finland; 5Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; 6Department of Environmental System Science, ETH Zurich, 8092 Zurich, Switzerland
The aim of this study is to improve the understanding of in-cloud aqueous secondary organics aerosol (SOA) formation from isoprene under different environmental conditions (e.g., temperature, OH exposure, NOx levels) including representing convective systems, using a Teflon chamber for photo-oxidation and a wetted-wall flow reactor (WFR) where the presence of a cloud was mimicked by a thin water microlayer.We will present first results of the chemical composition of the liquid microlayer, compare that to the gas-phase composition, and put the results in perspective of recent ambient direct observations in high-altitude Amazon air masses.
12:15pm - 12:30pmTU2-5: 4
Analysis of PFAS in Cloud Water at Sonnblick observatory
Michaela Porkert1,2, Thomas Riedelberger1, Christian Maier3, Felix Happenhofer2, Martin Gregori2, Anne Kasper-Giebl1
1TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9 1060 Vienna Austria; 2MAPAG GmbH, Industriestraße 7, 2352 Gumpoldskirchen Austria; 3GeoSphere Austria, Hohe Warte 38 1190 Vienna Austria
Cloud water samples and snow samples collected at the Sonnblick observatory at "Hoher Sonnblick" in the Austrian alps were analysed via HPLC-MS/MS, for 20 PFAS mentioned in the EU drinking water guidelines, and related to available literature.
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