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UP: Fachverband Umweltphysik

UP 7: Posters

UP 7.4: Poster

Mittwoch, 28. Februar 2024, 16:30–18:30, ELP 6: Foyer

Single particle polarimetry of volcanic ash in a plasma traps — •Franko Greiner¹, Alexander Schmitz¹, Thor Hansteen², and Christian von Savigny³ — ¹Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany — ²Dynamics of the Ocean Floor, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany — ³Institute of Physics, University of Greifswald, Greifswald, Germany

Numerous aspects of volcanic effects on the atmosphere and climate remain poorly understood. A significant but often overlooked factor is the presence of volcanic ash in aerosol plumes, which is typically ignored in satellite observations in the optical spectral range due to limited data on the ash’s complex refractive index (CRI). Accurate identification of volcanic ash in these observations requires understanding both the CRI and its variability among different eruptions.

We propose a new, less assumption-dependent laboratory method for measuring the CRI of volcanic ash. Using a plasma trap and assessing angle-resolved Mie scattering of single ash particles, this approach aims to provide high-precision CRIs. The project’s main goal is to explore whether the CRI of a specific volcanic event may be determined based on ash amorphicity and chemical composition.

Keywords: Complex refractive index,; Remote sensing; VIS/NIR; volcanic ash; plasma trap