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The performances of satellite and sondes ozone measuring instrumentsavailable in the tropics between 10 and 26 km during the southern hemispheresummer in 2003 and 2004, have been investigated by comparison with series ofprofiles obtained by solar occultation in the visible Chappuis bands using aSAOZ UV-Vis spectrometer carried by long duration balloons. When compared toSAOZ, systematic positive or negative altitude shifts are observed in thesatellite profiles, varying from <50 m for the GOMOS v6.0b stellaroccultation instrument, followed by +100/200 m for solar occultation systems(SAGE II v6.2, HALOE v19 above 22 km), but as large as −900 m for theOSIRIS limb viewing system. The ozone relative biases are generally limited,between −4% and +4%, for measurements in the visible Chappuis bands(SAGE II and SAGE III moon v3, GOMOS above 22 km and OSIRIS), the near IR(HALOE above 22 km) and the ozonesondes, but increase to +5.5%(SCIAMACHY IUP v1.63) though still in the visible, and +7% in the mid-IR(MIPAS NL v4.61) and the submillimetric range (SMR v222). Regardingprecision, evaluated statistically from the zonal variability of ozoneconcentration, the best measurements are found to be those of SAGE II (2%),followed by HALOE above 22 km (3–4%), then the ozonesondes, SAGEIII moon, SCIAMACHY and OSIRIS (4–5%), GOMOS above 22 km (~6%),MIPAS (8.5%) and finally SMR (16%). Overall, all satelliteozone measurements appear to be of little utility in the tropicaltroposphere except those of SAGE II (and eventually SAGE III), though lowbiased by 50% and of limited (50%) precision

atmospheric chemistry and physics

Evaluation of ozonesondes, HALOE, SAGE II and III, Odin- OSIRIS and -SMR, and ENVISAT-GOMOS, -SCIAMACHY and -MIPAS ozone profiles in the tropics from SAOZ long duration balloon measurements in 2003 and 2004