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We investigate the effect of using three different crosssection data sets on ozone profile retrievals from Global Ozone MonitoringExperiment (GOME) ultraviolet measurements (289–307 nm, 326–337 nm). Theseinclude Bass-Paur, Brion, and GOME flight model cross sections (referencesbelow). Using different cross sections can significantly affect theretrievals, by up to 12 Dobson Units (DU, 1 DU=2.69×10<sup>16</sup> molecules cm<sup>−2</sup>) in total column ozone, up to 10 DU in troposphericcolumn ozone, and up to 100% in retrieved ozone values for individualatmospheric layers. Compared to using the Bass-Paur and GOME flight modelcross sections, using the Brion cross sections not only reduces fittingresiduals by 15–60% in the Huggins bands, but also improves retrievals,especially in the troposphere, as seen from validation against ozonesondemeasurements. Therefore, we recommend using the Brion cross section forozone profile retrievals from ultraviolet measurements. The total columnozone retrieved using the GOME flight model cross sections is systematicallylower, by 7–10 DU, than that retrieved using the Brion and Bass-Paur crosssections and is also systematically lower than Total Ozone MappingSpectrometer (TOMS) observations. This study demonstrates the need forimproved ozone cross section measurements in the ultraviolet to improveprofile retrievals of this key atmospheric constituent

Impact of using different ozone cross sections on ozone profile retrievals from Global Ozone Monitoring Experiment (GOME) ultraviolet measurements