München 2019 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 2: Air pollution and tropospheric chemistry
UP 2.2: Vortrag
Dienstag, 19. März 2019, 11:45–12:00, HS 22
Comparative measurements of two Long Path-DOAS for detection of ship emissions — •Kai Krause1, Folkard Wittrock1, Stefan Schmitt2, Denis Pöhler2, Andreas Weigelt3, and Stefan Schmolke3 — 1Institut für Umweltphysik, Universität Bremen — 2Institut für Umweltphysik, Universität Heidelberg — 3Bundesamt für Seeschifffahrt und Hydrographie
Ships are an important source of particles and traces gases like CO, CO2, NOx (NO + NO2), SO2, VOCs, PM and black carbon. Most of the emissions are found in close proximity of the coast.
Some of the above mentioned trace gases can be measured using the differential optical absorption spectroscopy (DOAS). To detect the emissions of ships two Long Path-DOAS have been set up in the Yachtharbour of Hamburg, in Wedel, to measure NO2 and SO2. One of the systems is a newly developed prototype, specifically designed to measure ship emissions, and is currently tested in Wedel, while the other system serves as a reference. The light path of both systems cross the Elbe river and thus allows to detect the plumes of the passing ships. The prototype system has been set up in October 2018, while the reference system is already running since April 2018.
Within the time series of both systems the plume of a single passing ship appears as a sharp peak. However peaks in NO2 and SO2 do not necessarily occur at the same time, sometimes there is a slight shift in time between both, or no SO2 peak at all.
Time series of both systems will be compared and NO2/SO2-ratios for different ship types will be shown.