Ozone Monitoring Instrument (OMI) collection 4: establishing a 17-year-long series of detrended level-1b data

Abstract. The Ozone Monitoring Instrument (OMI) was launched on 15 July 2004, with an expected mission lifetime of 5 years. After more than 17 years in orbit the instrument is still functioning satisfactorily and principle can continue doing so until decommissioning its platform Aura 2025. In order to datasets acquired by OMI Microwave Limb Sounder, extended up at least 2023. Actions have been taken ensure proper operations, data processing, calibration monitoring system eventual end mission. For processing a new level-0 (L0) level-1b (L1b) processor built based recent developments for TROPOspheric (TROPOMI). With corrections degradation now included, it feasible generate collection supersede current collection-3 products reprocess entire now. This paper describes differences between collection-4 data. It will be shown that L1b comprise clear improvement respect previous collections. By correcting gentle optical electronic aging has occurred over past years, OMI's ability make trend-quality ozone measurements further improved.