<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Determination of two dimensional trace gas distributions using tomographic LP-DOAS measurements in the city of Heidelberg, Germany"^^ . "Tomographic Long path Differential Optical Absorption Spectroscopy (LP-DOAS) allows two and three dimensional determination of trace gas distributions by measuring the average concentration along 10 to 20 intersecting light paths and applying tomographic inversion techniques. In this thesis such a setup was developed and applied for the first time to determine the horizontal distribution of several trace gases in the open atmosphere. The measurements took place in the city of Heidelberg, Germany from 2005 to 2007 and focused on the trace gases NO2, SO2, O3, HCHO and HONO, which play a major role in the polluted atmosphere. The setup consisted of three Multi Beam LP-DOAS instruments and 20 retro reflector arrays all installed on different buildings in the city. The 20 realised intersecting light paths covered an area of 4 × 4 km² with different emission sources. The retrieved horizontal trace gas distributions had a temporal resolution of up to 15 minutes with best results for NO2, SO2 and O3. The highest trace gas concentrations (except for O3) and spatial variations arose during low wind situations. Emission sources varying in space and time could be distinguished and identified mainly as emissions from traffic (NO2 with O3 depletion) and power plants / industry (SO2). Several insights into chemical processes in the atmosphere could be gained by studying the interrelationship of the measured trace gases. HONO, for example, displayed much lower spatial variability than NO2 and was thus not directly emitted by the same source but rather formed in heterogeneous reactions. Transport processes of plumes were also investigated."^^ . "2010" . . . . . . . . "Denis"^^ . "Pöhler"^^ . "Denis Pöhler"^^ . . . . . . "Determination of two dimensional trace gas distributions using tomographic LP-DOAS measurements in the city of Heidelberg, Germany (PDF)"^^ . . . "Poehler_Denis_Dissertation_2010.pdf"^^ . . . "Determination of two dimensional trace gas distributions using tomographic LP-DOAS measurements in the city of Heidelberg, Germany (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Determination of two dimensional trace gas distributions using tomographic LP-DOAS measurements in the city of Heidelberg, Germany (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Determination of two dimensional trace gas distributions using tomographic LP-DOAS measurements in the city of Heidelberg, Germany (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Determination of two dimensional trace gas distributions using tomographic LP-DOAS measurements in the city of Heidelberg, Germany (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Determination of two dimensional trace gas distributions using tomographic LP-DOAS measurements in the city of Heidelberg, Germany (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #10996 \n\nDetermination of two dimensional trace gas distributions using tomographic LP-DOAS measurements in the city of Heidelberg, Germany\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .