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UP: Umweltphysik

UP 3: Atmosph
ärische Spurengase und Aerosole: Intrumentelles I

UP 3.6: Fachvortrag

Montag, 7. März 2005, 15:45–16:00, TU TA201

Tomographic DOAS measurements of the 2D trace gas distribution above the city centre of Heidelberg, Germany — •Denis Poehler, Bernhard Rippel, Alexander Stelzer, Kai Uwe Mettendorf, Andreas Hartl, Ulrich Platt, and Irene Pundt — IUP Universität Heidelberg

Longpath DOAS (Differential Optical Absorption Spectroscopy) tomography ia a novel methode for the measurement of 2 or 3 dimensional trace gas distributions. Average concentrations of different trace gases are measured along 10 to 40 light paths and inverted into concentration distributions using tomographic techniques (see Mettendorf et al., Hartl et al., this issue). Here we present the instrumental setup and first results from a tomographic configuration set up over the city of Heidelberg in spring 2005. Three Multibeam instruments and 10 to 20 retro arrays will be installed over an area of 3 km x 4 km. From each Multibeam telescope, four to six light beams are emitted simultaneously towards the retro arrays located at 1 to 5 km distance at various buildings. From there, the light beams are reflected back towards the telescopes, where they are coupled into optical fibres and spectrally analysed simultaneously using Cherny Turner spectrometers with 2D CCD detectors. The preliminary aim is to derive 2D distributions of NO2, SO2, O3, HCHO, and HONO.