TDLAS trace gas measurements within a mountain wave over northern Scandinavia during the POLSTAR campaign in early 1997

Mountain waves play an important tole in the understanding of the chemistry and the dynamics of the lower stratosphere. The possibility of local cooling of several Kelvin by adiabatic displacements of air parcels could lead to the formation of PSC's (polar stratospheric clouds) which occur approximately between 15 and 30 km [1] [2]. Heterogeneous chemistry on the surface kof these PSC's could then lead to the destruciton of ozone [3]. Since thesse waves are too small in their spatial extent to be resolved in meterological models their effects on global atmospheric dynamics and chemistry needs to be described by parameters based on in-situ and/or ground based measurements with sufficent temporal and spatial resolutions. We have performed such measurements in the scope of the Arctic winter campaign POLSTAR I (Polar Strytospheric Aerosol Experiment) which took place from 20 January to 7 February 1997 from Kiruna, North Sweden in order to study dynamical and chemical processes at tropopaus e altitudes. In this paper we will concentrate on our high resolution measurements of CO performed on 1/2 February 1997 on the DLR Falcon aircraft during a mountain wave event.