Berlin 2012 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 2: Atmosphere 1

UP 2.3: Vortrag

Dienstag, 27. März 2012, 10:15–10:30, HFT-FT 131

Ice nucleation and growth on atmospheric aerosol particles studied in the Environmental Scanning Electron Microscope — •Alexei Kiselev¹, Volker Zibat², and Thomas Leisner¹ — ¹Karlsruher Institut für Technologie (KIT) Institut für Meteorologie und Klimaforschung (IMK-AAF) — ²Karlsruher Institut für Technologie (KIT) Laboratorium für Elektronenmikroskopie (LEM)

Environmental scanning electron microscopy (ESEM) enables in situ observation of interactions between water vapor and aerosol particles in the sub-micrometer range. By increasing the H2O pressure in the sample chamber at constant temperature, ice formation can be observed directly and can be related to the morphology and chemical composition of the particles. At the same time, the aerosol particles proved to have the highest ice nucleating ability can be studied simultaneously by energy-dispersive X-ray microanalysis (EDX). In this contribution we describe the experimental setup, calibration procedure and show the first results of the ice nucleation on mineral dust particles and bacteria studied in ESEM.