IMPROVED CORRECTION FOR CONTAMINATION-INDUCED IN-FLIGHT INSTRUMENT DEGRADATION OF SCIAMACHY

摘要

SCIAMACHY suffers from degradation due to contamination of the scan mirror surfaces, optical components in the Optical Bench Module, and detector surfaces. We have improved the polarisation and degradation description of the instrument as well as the optical ground support equipment used for initial on-ground instrument calibration. This allows for a consistent model of the instrument for both on-ground and in-flight conditions, and for arbitrary amounts of contamination of the instrument. Using this model we have re-analysed the in-flight calibration and monitoring data to arrive at an improved description of the throughput and polarisation sensitivity of SCIAMACHY, for any time during its mission.