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UP: Umweltphysik

UP 9: Die „Atmosph
äre“ im Labor

UP 9.1: Fachvortrag

Montag, 22. März 2004, 17:30–17:45, HS 020

The Atmosphere Simulation chamber SAPHIR:, A tool for the investigation of photochemistry. — •Theo Brauers, Birger Bohn, Franz-Josef Johnen, Rolf Häseler, Franz Rohrer, Sonia Rodriguez-Bares, Ralf Tillmann, and Andreas Wahner — Institut für Chemie und Dynamik der Geosphäre (ICG-II), Forschungszentrum Jülich

On the campus of the Forschungszentrum Jülich we constructed SAPHIR(Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) which consists of a 280-m³ double-wall Teflon bag of cylindrical shape that is held by a steel frame. Typically 75% of the outside actinic flux (290 nm – 420 nm) is available inside the chamber. A louvre system allows switching between full sun light and dark within 40 s giving the opportunity to study relaxation processes of the photo chemical system. The SAPHIR chamber is equipped with a comprehensive set of sensitive instruments including the measurements of OH, HO₂, CO, hydro-carbons, aldehydes, nitrogen-oxides and solar radiation. Moreover, the modular concept of SAPHIR allows fast and flexible integration of new instruments and techniques. In this paper we will show the unique and new features of the SAPHIR chamber, namely the clean air supply and high purity water vapor supply providing a wide range of trace gas concentrations being accessible through the experiments. We will also present examples from SAPHIR experiments showing the scope of application from high quality instrument inter-comparison and kinetic studies to the simulation of complex mixtures of trace gases at ambient concentrations.