Title A new modeling tool for the diffusion of gases in ice or amorphous binary mixture in the polar stratosphere and the upper troposphere
Author Varotsos, C.A.; Zellner, R.
Author Affil Varotsos, C.A., University of Athens, Department of Applied Physics, Athens, Greece. Other: Universitšt Duisberg- Essen, Germany
Source Atmospheric Chemistry and Physics, 10(6), p.3099-3105, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2010
Notes In English. Includes Corrigendum, http://www.atmos-chem-phys.net/10/3333/2010/; published in Atmospheric Chemistry and Physics Discussions: 1 December 2009, http://www.atmos-chem-phys- discuss.net/9/25723/2009/acpd-9-25723- 2009.html ; accessed in May, 2011. 63 refs. GeoRef Acc. No: 310082
Index Terms diffusion; gases; geochemistry; hydrocarbons; ice; ozone; particles; polar regions; stratosphere; water; polar regions; acetic acid; activation energy; alcohols; aliphatic hydrocarbons; alkanes; amorphous materials; carboxylic acids; climate forcing; depletion; formic acid; heterogeneity; hydrogen chloride; lattice; mechanism; methane; methanol; organic acids; organic compounds; rates; solar forcing; troposphere
Abstract To elaborate stratospheric ozone depletion processes, measurements of diffusion coefficients of selected gas phase molecules (i.e. HCl, CH3OH, HCOOH and CH3COOH; Katsambas et al., 1997; Kondratyev and Varotsos, 1996; Varotsos et al., 1994, 1995) 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.
URL http://www.atmos-chem-phys.net/10/3099/2010/acp-10-3099-2010.pdf
Publication Type journal article
Record ID 65006771