Dresden 2011 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 7: Aerosols
UP 7.2: Vortrag
Donnerstag, 17. März 2011, 10:15–10:30, HSZ 204
Volcanic ash particles from the Eyjafjallajökull eruption as ice nuclei in clouds — •Isabelle Steinke1, Ottmar Möhler1, Alexei Kiselev1, Monika Niemand1, Harald Saathoff1, Julian Skrotzki1, Martin Schnaiter1, Corinna Hoose1, and Thomas Leisner1,2 — 1Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research - Atmospheric Aerosol Research (IMK-AAF), Karlsruhe, Germany — 2Institute for Environmental Physics (IUP), Ruprecht-Karls-University Heidelberg, Germany
Ice nucleation in clouds is triggered by aerosols and often initiates precipitation, thus impacting life cycles and radiative properties of clouds. Volcanic eruptions episodically increase the atmospheric particle load; due to their mineralogical composition volcanic ash particles are assumed to serve as ice nuclei in mixed-phase and cirrus clouds. The first measurements of ice nucleation properties of fine ash particles from the Eyjafjallajökull eruption in April 2010 have been conducted at the AIDA (Aerosol Interaction and Dynamics in the Atmosphere) cloud chamber in Karlsruhe. The sample that has been used for the aforementioned experiments has been collected on April 15, 2010 at a distance of 58 km from the volcano and was kindly provided by the University of Iceland. Also, the elemental composition and surface characteristics of the volcanic particles have been investigated with an electron microscope (ESEM/EDX). Additionally, combining experimental results with a model of the relevant aerosol-cloud interaction processes will allow for a detailed comparison with ice nucleation properties that other aerosol types such as mineral dust have shown.