Measurements of trace gas distributions using Long-path DOAS-Tomography during the motorway campaign BAB II: experimental setup and results for NO sub(2)

• Published in: Atmospheric environment (1994) 2005-02, Vol.39 (5), p.967-975
• Main Authors: Pundt, I, Mettendorf, K-U, Laepple, T, Knab, V, Xie, P, Losch, J, Friedeburg, Cv, Platt, U, Wagner, T
• Format: Article
• Language: English
• ISSN: 1352-2310
• DOI: 10.1016/j.atmosenv.2004.07.035

The Tomographic Differential Optical Absorption Spectroscopy (Tom-DOAS) technique and results from a first application are presented. This novel technique serves to measure 2-3-dimensional concentration fields of different trace gases (e.g. NO sub(2), SO sub(2), ozone) in the planetary boundary layer on a small scale (100-10 000 m) by the use of multiple light paths. Ways to use telescopes, lamps, retroreflector arrays and spectrometers for the simultaneous measurement of many light-paths are proposed. The results from a first Long-path Tom-DOAS experiment next to a German motorway, which was part of the BAB II campaign April/May 2001 [Edition of the Institut fur Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe/Universitat Karlsruhe, pp. 45, 2001), are presented. From the measurements along 16 different light paths vertical profiles on both sides of the motorway as well as a two-dimensional map of the NO sub(2) vehicle emission plume are derived. The concentration distributions agree qualitatively with model simulations of an earlier campaign.