Abstract
During January and February 1990 groundbased UV/visible spectroscopic observations of direct moon light and zenith scattered sun light were performed near Kiruna, Sweden at 67.9°N, 21.1°E. From the measured differential absorption of NO2 and OClO the corresponding slant column abundances were determined and converted to vertical column densities using airmass factors evaluated by a ray tracing model. Upper limits for the stratospheric NO2 column of 0.4–0.9 · 1015/cm² were deduced and elevated levels of OClO could be detected during Feb. 6–8.
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