Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 15 2007 10.5194/acp-7-4117-2007 http://www.atmos-chem-phys.net/7/4117/2007/ http://www.atmos-chem-phys.net/7/4117/2007/acp-7-4117-2007.html http://www.atmos-chem-phys.net/7/4117/2007/acp-7-4117-2007.pdf 4117 4131 2007-08-06 Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA K. Hocke klemens.hocke@mw.iap.unibe.ch N. Kämpfer D. Ruffieux L. Froidevaux A. Parrish I. Boyd T. von Clarmann T. Steck Y. M. Timofeyev A. V. Polyakov E. Kyrölä Institute of Applied Physics, University of Bern, Switzerland MeteoSwiss, Payerne, Switzerland Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA University of Massachusetts, USA Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe und Universität Karlsruhe, Germany Department of Atmospheric Physics, St. Petersburg State University, Russia Finnish Meteorological Institute, Helsinki, Finland Stratospheric O₃ profiles obtained by the satellite limb sounders Aura/MLS, ENVISAT/MIPAS, ENVISAT/GOMOS, SAGE-II, SAGE-III, UARS/HALOE are compared to coincident O₃ profiles of the ground-based microwave radiometer SOMORA in Switzerland. Data from the various measurement techniques are within 10% at altitudes below 45 km. At altitudes 45–60 km, the relative O₃ differences are within a range of 50%. Larger deviations at upper altitudes are attributed to larger relative measurement errors caused by lower O₃ concentrations. The spatiotemporal characteristics of the O₃ differences (satellite – ground station) are investigated by analyzing about 2300 coincident profile pairs of Aura/MLS (retrieval version 1.5) and SOMORA. The probability density function of the O₃ differences is represented by a Gaussian normal distribution. The dependence of the O₃ differences on the horizontal distance between the sounding volumes of Aura/MLS and SOMORA is derived. While the mean bias (Aura/MLS – SOMORA) is constant with increasing horizontal distance (up to 800 km), the standard deviation of the O₃ differences increases from around 8 to 11% in the mid-stratosphere. Geographical maps yield azimuthal dependences and horizontal gradients of the O₃ difference field around the SOMORA ground station. Coherent oscillations of O₃ are present in the time series of Aura/MLS and SOMORA (e.g., due to traveling planetary waves). Ground- and space-based measurements often complement one another. 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