MEASUREMENT OF THE LATITUDINAL DISTRIBUTION OF NO2 COLUMN DENSITY ANDLAYER HEIGHT IN OCT NOV 1993

In October/November 1993 DOAS measurements of total columns of NO2 and O-3 were performed on a ship cruise from Germany to South Africa. The results are compared to data collected during an earlier campaign wit h a similar setup [Kreher et al. 1995], which took place in 1990, befo re the eruption of the Pinatubo volcano. Overall no general trend for NO2 in 1993 in comparison to 1990 could be detected. The O-3 vertical column densities in 1993 are mostly around 280 Dobson Units, showing a significant increase to over 330 DU south of 25 degrees S, and signif icantly lower O-3 values south of 50 degrees S. The height of the NO, concentration maximum was calculated from the NO2 am/pm ratio and data from ozonesondes. The resulting heights are mostly round 29km, except in the region (south of approximate to 45 degrees S) where the lowest ozone column densities occurred, there the calculated height is appro ximate to 22 km.