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The GOMOS ozone profiles have been analysed to evaluate the GOMOSability to capture the long-term ozone evolution at mid-latitudesduring the expected recovery phase of the ozone layer. Version 5 ofthe operational GOMOS ozone data has been compared with data fromtwo of the longest ground-based instruments based on differenttechniques and already involved with many other previous spaceinstrument validations. Comparisons between ground-based and GOMOSdata confirm the occurrence of spurious retrievals mainly occurringsince 2006. Using a selected set of data it is shown that some badretrievals are induced by the increasing dark charge of thedetectors combined with an inadequate method for its correction.This effect does not only induce a continuous bias, but is ratherexhibiting a bimodal distribution including the correct profiles andthe bad retrievals. For long-term analyses it is recommendedfiltering the data according to background light conditions and startemperature (spectrum shape). The new method of the dark chargeestimate proposed to be implemented in the version 6 of the ESAalgorithm seems to significantly reduce the occurrence of sucheffects and should allow to monitor stratospheric ozone using GOMOSdata with greater confidence

Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue