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This paper summarises the validation of GOME total ozone retrieved  using the Weighting Function Differential Optical Absorption  Spectroscopy (WFDOAS) algorithm Version 1.0. This algorithm has been  described in detail in a companion paper by Coldewey-Egbers et al. (2005). Compared to the operational GDP (GOME Data  Processor) V3, several improvements to the total ozone retrieval  have been introduced that account for the varying ozone dependent  contribution to rotational Raman scattering, includes a new cloud  scheme, and uses the GOME measured effective albedo in the  retrieval. In this paper the WFDOAS results have been compared with  selected ground-based measurements from the WOUDC (World Ozone and  UV Radiation Data Centre) that collects total ozone measurements  from a global network of stations covering all seasons.  From the  global validation excellent agreement between WFDOAS and ground data  was observed. The agreement lies within ±1%, and very little  seasonal variations in the differences are found.  In the polar  regions and at high solar zenith angles, however, a positive bias  varying between 5 and 8% is found near the polar night period. As a  function of solar zenith angle as well as of the retrieved total  ozone, the WFDOAS differences to ground polar data, however, show a  much weaker dependence as compared to the operational GOME Data  Processor Version 3 of GOME that represents a significant  improvement.  Very few stations carry out simultaneous measurements  by Brewer and Dobson spectrometers over an extended period (three  years or more). Simultaneous Brewer and Dobson measurements from  Hradec Kralove, Czech Republic (50.2N, 15.8E) and  Hohenpeissenberg, Germany (47.8N, 11.0E) covering the  period 1996-1999 have been compared with our GOME results.  Agreement with Brewers are generally better than with the  simultaneous Dobson measurements and this may be explained by the  neglect of stratospheric (ozone) temperature correction in the  standard ozone retrieval from the ground

Pole-to-pole validation of GOME WFDOAS total ozone with groundbased data