Hamburg 2009 – scientific programme

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UP: Fachverband Umweltphysik

UP 10: Poster: Umweltphysik

UP 10.22: Poster

Thursday, March 5, 2009, 17:48–19:00, VMP 9 Poster

Auto-Max-Doas — •Rainer Volk, Christoph Kern und Ulrich Platt — Institut für Umweltphysik, Heidelberg

Car based zenith DOAS measurements have become a standard tool to asses trace gas fluxes of spatially defined sources such as volcanoes or industrial stacks. The technique utilizes absorption structures in sun light which has passed the zone of interest to determine the amount of gas in the respective light path. In combination with known parameters such as wind speed and direction, emission fluxes can be assessed. This approach was enhanced by an additional measuring angle. The simultaneous measuring at different angles allows the determination of further parameters of the measurement geometry e.g. knowledge about layer heights and can increase the measurement sensitivity to certain gases of interest. In order to provide the operator with a first approximate, evaluation algorithms were adapted to analyse the data in real time, which is extremely useful for determining measurement routes. In this contribution, the results of emission flux measurements performed at German power plants and industrial sites will be presented. Detailed analyses of collected data yielded NO2 fluxes of between 20 g/s and 150 g/s at different German power plants with plume heights ranging between 300m and 1000m.