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UP: Umweltphysik

UP 12: Instrumentelles und Laborexperimente - Poster

UP 12.3: Poster

Monday, March 18, 2002, 16:30–18:00, Galerie 1

Multi-AXis-(MAX) DOAS Measurements of NO2 during the BAB II Motorway Emission Campaign — •Christoph v. Friedeburg, Irene Pundt, Kai-Uwe Mettendorf, Thomas Wagner, and Ulrich Platt — Institute for Environmental Physics INF 229 69120 Heidelberg

Multi-Axis-DOAS measurements, based upon the renowned DOAS technique (Platt, 1994) provide a methodology to resolve spatial distributions of various trace gases using scattered light from the sun or other non-artificial sources. Two basic techniques can be used: one telescope trained in different directions sequentially by means of a mechanical motor drive, or several telescopes directing their light onto a two-dimensional CCD-Chip which allows for simultaneous measurements in several directions.

As part of the IUP Heidelberg tomography group’s contribution to the BAB II campaign in April and May 2001, a CCD based MAX DOAS apparatus with ten telescopes was placed near the A 656 motorway. It measured the NO2 Slant Column Densities using scattered sunlight with a time resolution of 1 minute. Three telescopes were directed across the motorway, and three parallel to it. Because of this geometry, the data can be compared to the SCD derived from the long path DOAS measurements performed during the campaign [Mettendorf et al. 2002, this issue]. The setup allowed for the tracking of the diurnal variation of a motorway plume, the assessment of the vertical structure as well as the comparison with the plume outreach of Heidelberg.