Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 3 2 2010 10.5194/amtd-3-1933-2010 http://www.atmos-meas-tech-discuss.net/3/1933/2010/ http://www.atmos-meas-tech-discuss.net/3/1933/2010/amtd-3-1933-2010.html http://www.atmos-meas-tech-discuss.net/3/1933/2010/amtd-3-1933-2010.pdf 1933 1970 2010-04-22 The ground-based MW radiometer OZORAM on Spitsbergen &ndash; description and validation of stratospheric and mesospheric O₃-measurements M. Palm mathias@iup.physik.uni-bremen.de C. G. Hoffmann S. H. W. Golchert J. Notholt IUP, Universität Bremen, Bremen, Germany This manuscript introduces the OZORAM ground based millimeter wave radiometer. The instrument is deployed to the high Arctic (79&deg; N, 12&deg; E) for measurements of O₃ in the upper stratosphere and lower mesosphere. <br><br> The discussion covers measurements taken since late 2006. To investigate instrumental biases, the results from September 2008 till spring 2009 are compared to O₃ profiles derived from measurements of two instruments onboard polar orbiting satellites, MLS onboard EOS-AURA and SABER onboard TIMED. The agreement is within 20% in the stratosphere and 40% in the mesosphere. The deviations show strong systematic and oscillating features, for which the error discussion of the ground based instrument/measurement gives possible explanations. <br><br> Nonetheless, expected features like the diurnal cycle and O₃ enhancements due to stratospheric warmings are readily observed, which could not originally be taken for granted given the large deviation from the satellite data. <br><br> The nature of the oscillatory deviation is further studied. This study points to a systematic error in the radiative transfer modeling caused by imperfect spectroscopic data. 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