Author(s)

Laurent Chaix and Michel J. Rossi

Abstract

Real-Time Kinetic Measurement of Condensation and Evaporation of Water Molecules on Ice at Temperatures between 140 and 220 K A contribution to subproject CMD Laurent Chaix and Michel J. Rossi Laboratoire de Pollution Atmospherique et Sol (LPAS), Ecole Poly technique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland Introduction Tropospheric and stratospheric clouds contain ice which is therefore an important constituent of atmospheric aerosols (Hobbs, 1974; Pruppacher, 1978). Consequently, condensation and evaporation of t^O vapour on and from ice are probably one of the most important atmospheric processes. The kinetics of condensation and evaporation has been the subject of many studies over the years. Values of the uptake coefficient y vary from 0.026 to unity (Haynes et aL, 1992), and depend on many factors such as the experimental technique, the type of ice used, the ambient press

Keywords