Leipzig 2002 – wissenschaftliches Programm

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UP: Umweltphysik

UP 11: Datenauswertung und Modellierung (Atmosphäre) - Poster

UP 11.5: Poster

Montag, 18. März 2002, 16:30–18:00, Galerie 1

Global measurements of ozone profiles by the satellite instruments Global Ozone Monitoring Experiment and Stratospheric Aerosol and Gas Experiment II: Intercomparisons considering dynamical aspects — •Astrid Bracher, Mark Weber, Klaus Bramstedt, and John P. Burrows — Institute of Environmental Physics, University of Bremen, P.O. Box 330440, 28334 Bremen

Stratospheric ozone profiles measured by the Global Ozone Monitoring Experiment (GOME on ERS-2, data version 50.70) and Stratospheric Aerosol and Gas Experiment II (SAGE II, data version 6.10) were compared over the entire GOME operation period between 1995 and 2001. GOME measures the reflected and backscattered radiation from earth and vertical profiles are derived from nadir observations using the Full Retrieval Method (FURM) which is based upon an advanced Optimal Estimation inversion scheme; SAGE II uses solar occultation to measure vertical profiles of ozone with an instantaneous vertical field of view of 1.6 km at the Earth limb. Using coincident measurements are identified by limiting time difference and distance between two data sets. For long lived substances, like ozone in the lower stratosphere, gradients in their horizontal distribution evolve from transport processes; thus validation at the border of different air masses is rendered more difficult. Origin of air masses can be determined by looking at the potential vorticity (PV) distribution at 46 hPa. Additional criteria apart from spatial and temporal coincidences an upper limit for the difference in PV between SAGEII and GOME are imposed. Instead of comparing zonal means, a presentation in the equivalent latitude system was found to be advantageous.