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UP: Umweltphysik

UP 20: Atmosph
äre und Messtechnik

UP 20.4: Fachvortrag

Dienstag, 23. März 2004, 17:15–17:30, HS 118

Retrieval of a NO₂ altitude profile by using MAX-DOAS-measurement — •Roman Sinreich, Barbara Dix, Chistoph v. Friedeburg, Udo Frieß, Magdalini Halasia, Suniti Sanghavi, Thomas Wagner und Ulrich Platt — IUP Heidelberg

>From May through September 2003 Multi-Axis(MAX)-DOAS-Measurements using scattered sunlight have been performed at the Institute of Environmental Physics in Heidelberg (Germany, 49.25^∘ N, 8.42^∘ E) to determine local NO₂ and O₄ slant column densities. The instrument was mainly pointing westward in direction of the city of Mannheim, since this region is expected to contain the highest concentrations of NO₂ due to the high traffic and industrial activity.
Several elevation angles were chosen to observe the atmosphere along different viewing directions. Air mass factors for several aerosol scenarios were modelled using the radiative transfer model Tracy. A detailed study was performed exemplarily for a clear afternoon (14^th of July 2003) comparing measurements of O₄ and NO₂ with corresponding model results to find the best matching profile both for aerosols and NO₂-values.
Due to the combination of MAX–DOAS measurements with the radiative transfer model the quantitative estimation of the total mixing ratio of trace gases is now possible opening a wide worldwide field for this technique in future.