Author(s)

Thomas G. Koch and Michel J. Rossi

Abstract

Measurement of Surface Residence Times of Halogen-Containing Molecules on Sea-Salt Mimics A contribution to subproject CMD Thomas G Koch and Michel J. Rossi Laboratoire de la Pollution Atmospherique et Sol (LPAS), Ecole Polytechnique Federate de Lausanne (EPFL), CH- 101 5 Lausanne, Switzerland Introduction Heterogeneous reactions of halogen containing atmospheric trace gases, such as C1ONO2 and C1NO2 on sea-salt aerosols, have been shown to play an important role in the marine troposphere as they may change the oxidative capacity of the troposphere (Versino, 1996). C1ONO: is a reservoir for active chlorine which is formed in the gas phase in the presence of NOx; C1NO2 is produced via the heterogeneous reaction of ^Os on NaCl. Either compound may interact with alkali halide surfaces to produce a more readily photolysable halogen- containing gas: C1NO2 + KBr -> BrNOz + KC1

Keywords