Bremen 2017 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 5: Postersession
UP 5.4: Poster
Dienstag, 14. März 2017, 16:40–18:10, GW2 B3010
Tower DOAS off-axis measurements of NO2 in Vienna, Austria — Stefan F. Schreier1 and •Andreas Richter2 — 1Institut für Meteorologie, Universität für Bodenkultur, Wien, Österreich — 2Institut für Umweltphysik, Universität Bremen, Bremen, Deutschland
Off-axis DOAS measurements were carried out on the rotating platform of the Danube Tower in Vienna (about 160 m above ground) in spring 2016. More than thirty rounds, each lasting for about 26 minutes, were performed on five days. After the measurements taken in off-axis direction inside the tower through a glass window, a couple of zenith-sky measurements were recorded from the open terrace (about ten meters below). The DOAS analysis is applied for the retrieval of O4 and NO2 differential slant column densities (DSCDs) in the visible spectral range. First results show a clear spatial variability in the distribution of NO2. Higher values are generally found above industrial areas and busy roads. O4 DSCDs are larger towards the plain, smaller towards the hilly area, and smallest towards the DC Tower (tallest skyscraper in Austria). The recorded spectral measurements have the potential to provide averaged NO2 mixing ratios in the horizontal path at about 160 m altitude for all directions.