Heidelberg 2015 – scientific programme

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UP: Fachverband Umweltphysik

UP 3: Meßtechnik

UP 3.6: Talk

Wednesday, March 25, 2015, 18:45–19:00, G/gHS

A Compact Longpath DOAS — •Nikolai Riedel, Stefan Schmitt, Denis Poehler, Sebastian Landwehr, Jens Tschritter, Holger Sihler, and Ulrich Platt — Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany

Longpath DOAS systems are well established and used in high sensitive measurements of trace gases in the atmosphere. Using active light sources trace gases can be measured independent of the sun. In the past these systems were dependent on electrical infrastructure and regular adjustment by experienced operators and thus had only a limited application. Based on an earlier prototype we developed a mobile Longpath DOAS instrument, which can perform autonomous measurements. The instrument is a low power system using different LED’s (315, 340 and 450 nm central wavelength) as light sources. Trace gases such as pollutants like NO₂, O₃, SO₂, HCHO and HONO can be measured as well as the halogen compounds ClO, BrO and IO. We present the developed system and first example measurements.