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Tropical tropospheric ozone columns are retrieved with the convective clouddifferential (CCD) technique using total ozone columns and cloud parametersfrom different European satellite instruments. Monthly-mean troposphericcolumn amounts [DU] are calculated by subtracting the above-cloudozone column from the total column. A CCD algorithm (CCD_IUP) has beendeveloped as part of the verification algorithm developed for TROPOsphericMonitoring Instrument (TROPOMI) on Sentinel 5-precursor (S5p) mission, whichwas applied to GOME/ERS-2 (1995–2003), SCIAMACHY/Envisat (2002–2012), andGOME-2/MetOp-A (2007–2012) measurements. Thus a unique long-term record ofmonthly-mean tropical tropospheric ozone columns (20° S–20° N)from 1996 to 2012 is now available. An uncertainty estimation has beenperformed, resulting in a tropospheric ozone column uncertainty less than 2 DU ( < 10 %) for all instruments. The dataset has not been yetharmonised into one consistent; however, comparison between the threeseparate datasets (GOME/SCIAMACHY/GOME-2) shows that GOME-2 overestimates thetropical tropospheric ozone columns by about 8 DU, while SCIAMACHY andGOME are in good agreement. Validation with Southern Hemisphere ADditionalOZonesondes (SHADOZ) data shows that tropospheric ozone columns from theCCD_IUP technique and collocated integrated ozonesonde profiles from thesurface up to 200 hPa are in good agreement with respect to range,interannual variations, and variances. Biases within ±5 DU androot-mean-square (RMS) deviation of less than 10 DU are found for allinstruments. CCD comparisons using SCIAMACHY data with tropospheric ozonecolumns derived from limb/nadir matching have shown that the bias and RMS deviation arewithin the range of the CCD_IUP comparison with the ozonesondes. The 17-yeardataset can be helpful for evaluating chemistry models and performing climatechange studies

Tropical tropospheric ozone columns from nadir retrievals of GOME-1/ERS-2, SCIAMACHY/Envisat, and GOME-2/MetOp-A (1996–2012)