Toward understanding iodine and sulfur secondary aerosol formation in marine atmosphere
Xu-Cheng He - University of Helsinki/University of CambridgeCambridge Fluids Network - fluids-related seminars12 March 2024 11:00amChemistry Dept, Unilever Lecture Theatre and ZoomClouds in marine and polar atmospheres play a pivotal role in shaping climate dynamics through intricate cloud-radiation interactions. Of particular significance are secondary aerosols, stemming from gas precursors, which act as potential nuclei for cloud droplets, exerting influence on cloud reflectivity and lifespan. This, in turn, has indirect impacts on climate. Despite their critical impact, the formation processes of marine and polar aerosols remain insufficiently explored due to experimental and logistical challenges. This presentation will present evidence drawn from field observations and laboratory experiments, underscoring the importance of iodine and sulfur species as key aerosol sources in polar and marine atmospheres. Our field observations expose the presence of HIO3 in diverse environments, including polar regions, boreal forests, marine sites, and urban areas. By combining global observations and laboratory experiments, we reveal the potential widespread involvement of iodic acid and iodous acid in marine secondary aerosol formation, challenging the traditional association of iodine aerosols solely with mid-latitudinal regions. To comprehensively grasp the worldwide implications of iodine and sulfur aerosol formation processes, a systematic analysis integrating ambient observations, laboratory experiments, and global simulations is deemed imperative.
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Topic: CAS seminar: Dr Xu-Cheng He
Time: Mar 12, 2024 11:00 AM London
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