1:45pm - 2:00pmTH3-1: 1
Halogen Contributions to New Particle Formation in the Arctic Atmosphere
Morten Engsvang, Yosef Knattrup, Jakub Kubečka, Jonas Elm
Aarhus University, Denmark
In this work, we combine our previous quantum chemical work on the contribution of iodine and chlorine to new particle formation into an aerosol model together with new sources of chlorine and iodine. We aim to achieve a better understanding of which chemical species that are important for describing the formation of new particles in the Arctic.
2:00pm - 2:15pmTH3-1: 2
New particle formation after fog dissipation in Arctic summer
Matthias Karl1, Caroline Leck2, Jost Heintzenberg3, Samuel Ruhl4, Rolf Sander4
1Helmholtz-Zentrum Hereon, Germany; 2Stockholm University, Stockholm, Sweden; 3Leibniz-Institute for Tropospheric Research, Leipzig, Germany; 4Max Planck Institute for Chemistry, Mainz, Germany
Observations of nucleation mode particles over the Arctic Ocean in summer have been associated with prolonged residence time over the pack ice, suggesting that their source is within the pack ice. In this study, the formation of nucleation mode particles over the pack ice is simulated using an aerosol dynamics model and representative particle size distributions from five Arctic Ocean expeditions. Both nucleation of iodic acid and release of marine biopolymer particles contributed to new particles after evaporation of fog. A sensitivity analysis investigates how iodine emissions, nucleation rates, iodne reactions and number flux of biopolymers affect nucleation mode particles.
2:15pm - 2:30pmTH3-1: 3
High-resolution 7Be in PM10 as a tracer of Stratosphere-Troposphere Exchange (STE) events
Mariassunta Biondi1, Alessandro Zappi1, Laura Laghi2, Domiziano Mostacci2, Erika Brattich3, Davide Putero4, Laura Tositti1
1Department of Chemistry “G. Ciamician”, University of Bologna; 2Department of Industrial Engineering, University of Bologna; 3Department of Physics and Astronomy "Augusto Righi", University of Bologna; 4CNR-ISAC, Turin
Time series of 7Be in atmospheric aerosols collected from the Antarctic plateau are employed in the STEAR project to investigate potential Stratosphere-Troposphere Exchange (STE) events. These events are critical due to their rapid and sporadic nature, yet their global mechanisms remain scarcely understood and concern the transport of stratospheric O3 to the troposphere. This study makes a substantial contribution by analyzing data collected over a prolonged period (February 2022 to December 2024) in a remote region, including Antarctic winter, with high temporal resolution through PM10 sampling every 2-4 days, enabling the extraction of novel insights into STE dynamics.
2:30pm - 2:45pmTH3-1: 4
Formation and cloud nuclei ability of secondary organic aerosols from emissions of Arctic macroalgae
Clément Dubois1, Eva Johanna Horchler1, Lotte Dyrholm Thomsen1, Kristoffer Larsen-Ledet2, Alina Mostovaya2, Mette Feng Bisgaard1, Celine Rebsdorf Frederiksen1, Teis Boderskov2, Annette Bruhn2, Johnna Michelle Holding2, Marianne Glasius1, Merete Bilde1
1Department of Chemistry, Aarhus University, Aarhus, DK-8000, Denmark; 2Department of Ecoscience, Aarhus University, Aarhus, DK-8000, Denmark
The Arctic is a sensitive environment with missing information on volatile organic compounds (VOC) and their potential to form aerosols, which can further impact cloud formation. Brown algae are important species in Arctic ecosystems and have been shown to be a source of VOC, with I2, being an important contributor to particle formation. Very few studies investigate the role of co-emitted VOC to I2-catalyzed particle formation, and knowledge on these contributions is lacking. Here, we conducted a chamber study to investigate particle formation and their potential to contribute to cloud formation from the VOC emissions of a brown Arctic macroalgae.
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