BALLOON-BORNE MASS-SPECTROMETER MEASUREMENTS OF HCL AND HF IN THE WINTER ARCTIC STRATOSPHERE

Altitude profiles of the stratospheric trace gases HCl and HF were simultaneously measured for the first time on 13 February 1992 at ESRANGE (68-degrees-N, 20-degrees-E, Northen Sweden) with a balloon-borne CIMS (Chemical Ionization Mass Spectrometry)-instrument. The measured maximum volume mixing ratios (VMR's) for HCl and HF are 2 ppbv and 0.6 ppbv, respectively, at 25 km. A comparison of the observed HCl VMR's with data from midlatitudes and model predictions shows, that the present VMR's of HCl are similar to VMR's of out-of-vortex situations.