Recent Improvements to NOAA-20 Ozone Mapper Profiler Suite Nadir Profiler Sensor Data Records

The NOAA-20 Ozone Mapping and Profiler Suite (OMPS) is the second OMPS flight unit in the US Joint Polar Satellite System (JPSS) program [1]. Flying on the NOAA-20 satellite, the OMPS extends the 40+-year total column ozone and ozone profile records to monitor ozone concentration in the Earth atmosphere. Recent studies have been conducted over a wide range of radiometric calibration and geolocation calibration areas to improve the quality of OMPS sensor data records. This study covers several topics, including the removal of a solar intrusion signal during science data collection, reduction of solar activity impact resulting from solar activities, update of geolocation accuracy via refinement of the instrument CCD spatial registration, and minimization of a misalignment at the edges of the sensor spatial field of view during Earth view measurements. The objective of this study is to improve OMPS instrument performance to OMPS users' expectations, and to advance the OMPS calibration accuracy of sensor data records above current product requirements [2], [3]. The solar intrusion correction improved local radiance retrieval accuracy 4% for the Nadir Profiler sensor, during science observations in the Northern hemisphere where solar zenith angle ranges from $60^{\circ}$ to $88^{\circ}$ . Solar model improvements achieve up to 1% better fidelity in irradiance measurements during solar observations. The calibrated CCD spatial registration minimizes the misalignment in the Nadir Mapper sensor spatial field of view in both cross track and along track measurements, and refines the geolocation accuracy to less than 5 km for the sensor's geolocation products that have a nominal spatial resolution of 50 km x 17 km.