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Ozone loss in the Arctic stratosphere over Kiruna, Sweden, during winter/spring 2005/06

Uwe Raffalski(1), Gerd Hochschild(2), Gerhard Kopp(2), Jo Urban(3) and Peter Voelger(1)

(1) Swedish Institute of Space Physics, Box 812, 98128 Kiruna, Sweden
(2) Forschungszentrum und Universität Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany
(3) Chalmers University of Technology, Hörsalsvägen 11, 412 96 Göteborg, Sweden


Abstract: We will present the Arctic ozone loss of the recent winter as derived from measurements of KIMRA. The millimeter wave radiometer KIMRA is operated continuously at IRF Kiruna (67.8 N and 20.4 E). From the measurements we calculated ozone profiles between 15 and 60 km. We derived column densities for this altitude region including most of the atmospheric ozone. In order to estimate the Arctic winter ozone loss we took into account only those measurements that have been taken while Kiruna was located well inside the polar vortex as defined by the 'Equivalent Latitude' method. Although this method has problems during the phase of formation and break up of the vortex it has a more flexible definition of the vortex edge. This leads to a significantly higher number of data points for the ozone loss analysis. Ozone loss can be hidden in dynamic effects such as subsidence of air masses inside the vortex. In order to correct for this effect we use N2O data from the Odin satellite. Given a stable polar vortex and more occasions of extensive PSC coverage as already has been observed in early January by the IRF lidar system we expect a substantial ozone loss for the winter 2005/06.


Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry