Impact of Level 1 quality on SCIAMACHY Level 2 retrieval
Lichtenberg, Günter and Gimeno-Garcia, Sebastian and Schreier, Franz and Slijkhuis, Sander and Hrechanyy, Serhiy and Doicu, Adrian and Snel, Ralph and Bovensmann, Heinrich (2010) Impact of Level 1 quality on SCIAMACHY Level 2 retrieval. COSPAR 2010, 18 Jul - 15 Jul 2010, Bremen, Germany.
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The SCIAMACHY instrument is suitable to retrieve vertical column densities (VCDs) and proﬁles of atmospheric gases from the UV/VIS to the SWIR spectral range. The quality of VCD retrievals depends on theoretical, computational and observational issues. Realistic atmospheric data as well as eﬃcient yet accurate, robust radiation transfer models and inversion methods have to be used. The quality of the measured spectra greatly aﬀects the accuracy of the retrievals. Since model parameters are optimally varied during the inversion process to mimic the measured values, errors in the input spectra will lead to wrong retrievals. SCIAMACHY spectra are spectrally and radiometrically calibrated and corrected for several effects, namely: Leakage current, pixel-to-pixel gain, non-linear response, straylight, polarisation and damaged pixels. Reﬂectances are calculated using in-ﬂight sun diﬀuser spectra. Addition- ally, the degradation of the instrument is being monitored and the quality of the individual spectral pixels assessed. In the past it was shown that - depending on the retrieved trace gas and the spectral region used - a good correction of eﬀects like stray light in the UV or bad pixels in the SWIR channels is essential for the quality of the level 2 data. In this paper we want to show the ﬁrst results of a systematic study of the impact of calibration (errors) and instrumental eﬀects on trace gas retrievals.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Impact of Level 1 quality on SCIAMACHY Level 2 retrieval|
|Date:||24 July 2010|
|Keywords:||Calibration SCIAMACHY retrieval|
|Event Title:||COSPAR 2010|
|Event Location:||Bremen, Germany|
|Event Type:||international Conference|
|Event Dates:||18 Jul - 15 Jul 2010|
|Organizer:||Comitee on Space Research|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Projekt ENVISAT (old)|
|Institutes and Institutions:||Remote Sensing Technology Institute > Atmospheric Processors|
|Deposited By:||Günter Lichtenberg|
|Deposited On:||01 Feb 2011 10:08|
|Last Modified:||17 Oct 2011 11:05|
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