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In many investigations of tropospheric chemistry information about thetwo dimensional distribution of trace gases on a small scale (e.g. tens to hundreds of metres)is highly desirable. An airborne instrument based on imaging Differential Optical AbsorptionSpectroscopy has been built to map the two dimensional distribution of a series of relevanttrace gases including NO2, HCHO, C2H2O2, H2O, O4, SO2,and BrO on a scale of 100 m. Here we report on the first tests of the novel aircraft instrument over the industrialisedSouth African Highveld, where large variations in NO2 column densities in the immediatevicinity of several sources e.g. power plants or steel works, were measured. The observed patternsin the trace gas distribution are interpreted with respect to flux estimates, and it is seen that thefine resolution of the measurements allows separate sources in close proximity to one another tobe distinguished

Direct observation of two dimensional trace gas distributions with an airborne Imaging DOAS instrument