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Limb scattering retrievals of atmospheric minor constituentprofiles require highly accurate knowledge of the tangent heightsduring the measurements. The limb scattering measurements of theScanning Imaging Absorption spectroMeter for AtmosphericCartograpHY (SCIAMACHY) on Envisat are affected by tangent heighterrors of up to 2 km. This contribution provides a summary of thetemporal and spatial variation of the SCIAMACHY limb pointingerrors during the first three years of the SCIAMACHY mission. Thetangent height errors are retrieved from the limb measurements inthe UV-B spectral range. A seasonal modulation of the monthly meantangent height offsets is identified with amplitudes of 800m (220m)before (after) the improvement of the Envisat orbit propagatormodel in December 2003. Even after the December 2003 orbit modelimprovement a constant offset component of about 1km is present.Furthermore, pointing discontinuities are identified that coincidewith the daily updates of the on-board orbit propagator model. Inorder to reduce the errors in ozone profile retrievals caused bypointing errors to less than 5%, the tangent heights have to beknown to within 250m

Spatial and temporal characterization of SCIAMACHY limb pointing errors during the first three years of the mission