Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster II
CPP 46.6: Poster
Thursday, March 12, 2026, 09:30–11:30, P5
Impact on snow albedo of soot aggregates inferred from their radiative properties — •Llorenc Cremonesi1, Luca Teruzzi1, Valentina Raspagni2, and Marco Potenza1 — 1University of Milan, Milan, Italy — 2Ca' Foscari University of Venice, Venice, Italy
Despite having a short lifespan in the atmosphere, soot aggregates are abundant and volatile enough to be found in various environments far from their sources. While suspended in the atmosphere, they influence local thermodynamic conditions and interact with water triggering cloud nucleation. These particles are also among the drivers of cryospheric degradation in climate-sensitive areas such as the Arctic and the European Alps.
The effectiveness with which soot aggregates interact with solar radiation is known to be related to their morphology as well as their composition. However, studies of their radiative properties rely on indirect or model-dependent measurements. We use a non-destructive optical technique that enables us to simultaneously measure several optical parameters on a particle-by-particle basis in situ.
Field measurements and laboratory tests show that aggregate particles exhibit exceptional scattering and absorption efficiencies relative to their mass. Directly assessing these properties obviates the need to characterise their exceptional morphological variability. By quantifying these properties, we evaluate the impact of carbon aggregates on snow, particularly in the uppermost layers.
Keywords: aerosols; snow albedo; light scattering; soot aggregates