Regensburg 2007 – scientific programme

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UP: Fachverband Umweltphysik

UP 19: Atmosphäre und Aerosole: Datenauswertung und Modellierung

UP 19.3: Talk

Wednesday, March 28, 2007, 16:45–17:00, Phy 5.0.20

Determination of chemical reaction rate constants for tropospheric gas phase reaction mechanisms by inverse modelling — •Nicola Toenges-Schuller, Birger Bohn, Theo Brauers, Hans-Peter Dorn, Frank Holland, Dirk Poppe, Franz Rohrer, Ralph Tillmann, and Andreas Wahner — ICG-II (Troposphere), Forschungszentrum Jülich, 52425 Jülich

Uncertain rate constants and unidentified processes are still a major source of uncertainty in modelling tropospheric gas-phase chemistry. Inverse modelling is used to deduce improved rate parameters from experimental data that were obtained in the simulation chamber SAPHIR (Simulation of Atmospheric Photochemistry In a large Reaction Chamber), where tropospheric chemistry can be measured under conditions that are typical for the lower troposphere. We shall report our results for a clean air experiment with low burdens of organic compounds.

Sensitivity and dependency studies using simulated measurements (= modelled time series supplied with noise according to the precision of the measurement instruments) are shown to provide an efficient tool to assess the validity of the approach.