Berlin 2014 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 2: Methoden - Fernerkundung

UP 2.2: Vortrag

Dienstag, 18. März 2014, 10:30–10:45, MAG 100

Atomic oxygen retrievals in the MLT region from SCIAMACHY nightglow observations — •Olexandr Lednyts'kyy and Christian von Savigny — Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Deutschland

Atomic oxygen in the mesosphere-lower thermosphere region (MLT) is one of the important reactive trace gases relevant for ozone and hydroxyl radical (OH) formation. The nightglow green line emission was measured near-globally by the sun-synchronous SCIAMACHY grating spectrometer aboard ENVISAT-1 satellite from August 2002 to April 2012 at approximately 22:00 LT. Atomic oxygen concentration [O] profiles were calculated with the SCIAMACHY volume emission rate profiles being retrieved from the limb emission rate profiles (upon solving of the inverse problem supported by the regularized total least squares minimization). The photochemical model based on the generally accepted 2-step Barth transfer scheme was applied in the calculation of [O] profiles on directly measured emissions of the excited atomic oxygen. Error analysis was done to estimate the maximum error uncertainty under assumption of independent contribution of errors for each considered parameter. The retrieved atomic oxygen profiles show the characteristic and expected seasonal variation in agreement with independent atmospheric models and satellite observations based on analysis of OH Meinel band emissions. Furthermore, a pronounced 11-year solar cycle variation can be identified in the atomic oxygen time series.