Quality Control of Belsk’s Dobson Spectrophotometer: Comparison with the European Sub-Standard Dobson Spectrophotometer and Satellite (OMI) Overpasses

The total ozone measurements by Belsk’s Dobson spectrophotometer have been compared with the satellite total ozone taken during the OMI (on board of Aura spacecraft) overpasses for the period August 2004 – July 2006. The agreement between both data sets is much better if the results of the recent (June 2005) calibration campaign of Belsk’s Dobson at Hohenpeissenberg are incorporated to the standard total ozone calculation software. The bias and standard deviation of the normalized differences between the satellite and Dobson total ozone are less than 1% and 2-3% (lower range of standard deviation is for the most reliable ADQP observations), respectively, for that period. These estimates correspond to those found for the satellite–Dobson comparisons carried out for Hradec Kralove and Hohenpeissenberg.