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UP: Umweltphysik
UP 5: Atmosph
ärische Spurengase und Aerosole: Instrumentelles
UP 5.2: Fachvortrag
Tuesday, March 14, 2006, 10:30–10:45, E
Inverse modelling of aerosol properties using Multi-Axis DOAS measurements — •Udo Friess1, Paul S. Monks1, John J. Remedios1, Thomas Wagner2, Alexej Rozanov3, and Ulrich Platt2 — 1Space Research Centre, University of Leicester, United Kingdom — 2Institut für Umweltphysik, Universität Heidelberg — 3Institut für Umweltphysik, Universität Bremen
A retrieval algorithm for the determination of aerosol properties using Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements based on non-linear optimal estimation is presented. Based on simulated MAX-DOAS measurements of the optical depth of the oxygen dimer O4 as well as on the variation of the intensity of diffuse skylight measured at different viewing directions and wavelengths, the capability of this measurement technique to derive the aerosol extinction profile as well as information on the phase function and single scattering albedo will be demonstrated. The information content, vertical resolution and retrieval errors under various atmospheric conditions will be discussed. The results of this model study suggest that the accuracy of MAX-DOAS measurements of the aerosol total optical depth is comparable with established methods of aerosol detection by Sun photometers (e.g. within the AERONET network) over a wide range of atmospheric conditions. Moreover, MAX-DOAS measurements contain information on the vertical profile of the aerosol extinction, and can be performed with a relatively simple, robust and self-calibrating instrumentation.