Atmos. Chem. Phys. Discuss., 9, 25723-25735, 2009
www.atmos-chem-phys-discuss.net/9/25723/2009/
doi:10.5194/acpd-9-25723-2009
© Author(s) 2009. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
A new modeling tool for the diffusion of gases in ice or amorphous binary mixture in the polar stratosphere and the upper troposphere
C. A. Varotsos1 and R. Zellner2
1Department of Applied Physics, University of Athens, Athens, Greece
2Institute of Physical Chemistry, University of Duisburg-Essen, Essen, Germany

Abstract. To elaborate stratospheric ozone depletion processes, measurements of diffusion coefficients of selected gas phase molecules (i.e. HCl, CH3OH, HCOOH and CH3COOH) in ice in the temperature range 170–195 K have been analyzed with respect to the mechanisms and rates of diffusion. It is argued that the diffusion in ice of these compounds is governed by a vacancy – mediated mechanism, i.e. H2O vacancies are required to diffuse to lattice sites adjacent to these compounds prior to the diffusion of the corresponding molecule into the vacancy sites. In addition, we show that the diffusion coefficients of these compounds exhibit a specific interconnection, i.e. a linear relationship holds between the logarithm of the pre-exponential factor, Do, and the activation energy E. The physical meaning of this interconnection is discussed.

Citation: Varotsos, C. A. and Zellner, R.: A new modeling tool for the diffusion of gases in ice or amorphous binary mixture in the polar stratosphere and the upper troposphere, Atmos. Chem. Phys. Discuss., 9, 25723-25735, doi:10.5194/acpd-9-25723-2009, 2009.
 
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