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As part of European Space Agency's (ESA) climate change initiative, high vertical resolution ozoneprofiles from three instruments all aboard ESA's Envisat (GOMOS, MIPAS,SCIAMACHY) and ESA's third party missions (OSIRIS, SMR,ACE-FTS) are to be combined in order to create an essential climate variabledata record for the last decade. A prerequisite before combining data is theexamination of differences and drifts between the data sets. In this paper, wepresent a detailed analysis of ozone profile differences based on pairwisecollocated measurements, including the evolution of the differences withtime. Such a diagnosis is helpful to identify strengths and weaknesses ofeach data set that may vary in time and introduce uncertainties in long-termtrend estimates. The analysis reveals that the relative drift between thesensors is not statistically significant for most pairs of instruments. Therelative drift values can be used to estimate the added uncertainty inphysical trends. The added drift uncertainty is estimated at about3 % decade<sup>−1</sup> (1σ). Larger differences and variability inthe differences are found in the lowermost stratosphere (below 20 km) and inthe mesosphere

Relative drifts and biases between six ozone limb satellite measurements from the last decade