Analysis of chemical perturbation of stratospheric air parcel along the trajectory during the Arctic winter of 1996/1997 using ILAS data

Reanalysis was made for quantitative chemical ozone loss rates in the Arctic stratospheric vortex by using ozone profile data (Version 5.10) obtained with the Improved Limb Atmospheric Spectrometer (ILAS) for the spring of 1997. The analysis method is based on the Match technique. In this study we calculated additional trajectories and set very strict criteria to identify a double-sounded air mass more reliably. The result shows that the integrated ozone loss during February and Match was 1.9 ppmv at 492-450 K levels (about 60 % losses) and the column ozone loss during two months was 84 DU. The ozone loss rate of the present study was larger than that of the sonde-Match analysis.