München 2004 – scientific programme

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UP: Umweltphysik

UP 20: Atmosph
äre und Messtechnik

UP 20.5: Fachvortrag

Tuesday, March 23, 2004, 17:30–17:45, HS 118

Results of an Indoor DOAS-Tomography Validation Experiment: On the Ability to Reconstruct 2D-Trace Gas Concentration distributions from Simultaneous Longpath- DOAS Measurements using up to 40 light paths. — •A. Hartl, V. Knab, T. Läpple, K.-U. Mettendorf, B. C. Song, U. Platt, and I. Pundt — Institut für Umweltphysik, Universität Heidelberg, INF 229, 69120 Heidelberg

DOAS-Tomography combines DOAS measurements yielding average concentrations along long light paths and tomographic methods to retrieve the spatial concentration distribution. To validate its techniques an indoor experiment was performed in August 2003 under well defined conditions. Cylinders filled with NO2 were used to assess the possibility to reconstruct local 2D-distributions using up to about 40 light paths. Here we present first reconstruction results and compare them to simulations using different measures to quantify the quality of the reconstruction. Sensitivity to measurement errors and to the number of light paths are discussed.