The new SCIAMACHY calibration and degradation approach and validation
Abstract
This presentation covers the highlights of the radiance, irradiance, polarisation and degrada-tion re-characterisation of SCIAMACHY and its validation. The imaging spectrometer SCIA-MACHY on ENVISAT has been collecting data since launch in 2002. Over the years the exposure to space has affected the optical performance and rendered the on-ground calibra-tion data increasingly more outdated. As the overall calibration quality is continuously being improved through better in-flight characterisation and updated algorithms, instrument aspects with previously acceptable errors are now in need of improvement. This required re-analysis of the on-ground calibration measurements, and pivots on measurements which were initially not intended for this type of calibration and an improved mirror-model for the scanner unit. Ad-ditionally, with the new approach it is possible to derive scan-angle dependended degradation-corrected calibration key data for the contaminated mirror surfaces in the scanner unit, thus improving the radiometric, polarisation, and scan-angle calibration of the instrument. We will present the new calibration approach and the first results of the validation.
- Publication:
-
38th COSPAR Scientific Assembly
- Pub Date:
- 2010
- Bibcode:
- 2010cosp...38..101K