S-NPP OMPS Nadir In-Flight Performance

Tuesday, 16 December 2014
Sherry Pan1, Lawrence E Flynn2, Jianguo Niu3, Michael Grotenhuis4, C. Trevor Beck5, Eric Beach6, Zhihua Zhang6 and Alin Tolea4, (1)University of Maryland College Park, CICS, College Park, MD, United States, (2)NOAA Center for Satellite Applications and Reserch, STAR, College Park, MD, United States, (3)NOAA Washington DC, Rockville, MD, United States, (4)Earth Resources Technology - ERT, Laurel, MD, United States, (5)NOAA Science Center, college park, MD, United States, (6)IMSG, College Park, MD, United States
This presentation describes the results of in-flight characterization of the S-NPP Ozone Mapping Profiler Suite (OMPS) charge-coupled device (CCD) performance during the first nearly three years of the OMPS mission in orbit. Data from OMPS’s three two-dimension CCD arrays have been collected to characterize in-flight detector behaviors. Our results show that offset, gain, and dark current rate trends remain within sensor requirement limits. System linearity performance trends are stable. The distribution of individual pixel dark rates is slowly growing as expected from pre-launch analyses. The current in-flight dark and linearity calibration corrections provide Sensor Data Records (SDRs) with insignificant error after correction of less than an average of ~0.1% in the Earth radiance retrieval. The instrument optics is less stable than predicted leading to intra-orbit wavelength scale variations as the temperature gradients vary across the instrument. Measurement-based estimates of these effects are as large a ±0.02 nm and are used to make corrections to within +-0.005 nm on a granule by granule basis. Examination of reflectivity, aerosol and ozone EDRs provide evidence of absolute calibration errors with a significant cross track variation. A soft calibration adjustment is under development to remove them.