SCIAMACHY: First Review of Calibration Parameters for the SWIR Channels for the Entire Mission
Lichtenberg, GŁnter1; Slijkhuis, Sander1; Aberle, Bernd1; Gimeno-Garcia, Sebastian1; Noel, Stefan2; Bramstedt, Klaus2; Snel, Ralph3; Krijger, Matthijs3; van Hees, Richard3; Dehn, Angelika4
1German Aerospace Centre (DLR), IMF, GERMANY; 2Institute of Environmental Physics/Remote Sensing Bremen (IUP/IFE)), GERMANY; 3Netherlands Institute for Space Research (SRON), NETHERLANDS; 4ESA-ESRIN, ITALY
SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) is a scanning nadir and limb spectrometer covering the wavelength range from 212 nm to 2386 nm in 8 channels. It is a joint project of Germany, the Netherlands and Belgium and was launched in February 2002 on the ENVISAT platform. After the platform failure in April 2012, SCIAMACHY is now in the postprocessing phase F. SCIAMACHY's originally specified in-orbit lifetime was double the planned lifetime. SCIAMACHY was designed to measure column densities and vertical profiles of trace gas species in the mesosphere, in the stratosphere and in the troposphere (Bovensmann et al., 1999). It can detect O3 , H2 CO, SO2 , BrO, OClO, NO2 , H2 O, CO, CO2 , CH4 , N2 O , O2 , (O2 )2 and can provide information about aerosols and clouds. The operational processing of SCIAMACHY aims to deliver continuously high quality data products to the scientific community. It is split into Level 0-1 processing (essentially providing calibrated radiances) and Level 1-2 processing providing geophysical products.
Now that the mission is in Phase F, the processing is no longer bound to the constraints of forward processing. Taking advantage of this fact, we will analyse the combined calibration data for the mission. This is especially important for the SWIR channels, because of the changing ice layer and the degradation of the detector. Using the results of this investigation, the calibration for the next re-processing campaign can be optimised to provide the better Level 1b data. In this paper we will present the first results of the study for the Dead and Bad Pixel mask, the dark calibration and the spectral calibration.