Bramstedt, Klaus
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Item-typ:Veröffentlichung, WF-DOAS V1.0 Validation ReportThis report summarizes the validation of the GOME total ozone derived from applying the weighting function DOAS (WF-DOAS) algorithm Version 1.0. This algorithm was developed as part of the GOTOCORD ESA project (see accompanying ATBD Report). The WF-DOAS results have been compared with selected ground-based measurements from the WOUDC (World Ozone and UV Radiation Data Centre) which collects total zone measurements from a global network of stations. Very few of these stations carry out simultaneous measurements by Brewer and Dobson spectrometers over an extended period (three years or more). Simultaneous Brewer and Dobson measurements from Hradec Kralove, Czech Republic (50.2◦N, 15.8◦E) and Hohenpeissenberg, Germany (47.8◦N, 11.0◦E) covering the period 1996-1999 have been compared with our GOME results and particular attention is paid to the differences between the two ground spectrometer types and GOME.BerichtHeft:Issue 1.2245 110 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Scan-angle dependent degradation correction with the scanner model approach(2014-04-28)SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) is a grating spectrometer in the UV-Vis-NIR spectral range on-board EnviSat (2002-2012). SCIAMACHY observes Earth’s atmosphere in nadir, limb and occultation geometry. The throughput of the instrument is monitored end-to-end by regular observations of the sun and the internal white light source (WLS). A new (scan-angle dependent) degradation correction is implemented as a joint effort of SRON (scanner model and algorithm prototype), IUP Bremen (operational m-factors) and MF-ATP-DLR (implementation into the L0-1b processor). Described by this technical note is the setup of the operational m–factor calculation, implemented for the next L0-L1b processor version (Version 8). For the degradation correction of Version 8, the radiometric (and the polarization) calibration approach has been changed. Both are split in a scanner unit part and an optical bench module (OBM, including the detectors) part. The scanner unit is described by a physical model of its components, which includes contamination layers on top of the optical components. The increase of these contamination layers accounts to a large extent for the observed degradation of the instrument.Buch195 96 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, SCIAMACHY V8 Solar Spectral Irradiance Validation(2017-11-27); ; ; SCIAMACHY (Scanning Imaging Absorption Spectrometer for Atmospheric Chartography) on-board the ESA Envisat satellite platform provided daily solar spectra in the wavelength region from 0.24 μm to 2.4 μm. The instrument was operating for nearly a decade from August 2002 to April 2012. This document reports on the validation of the SCIAMACHY solar spectral irradiances (SSI) in its data version 8. Like other UV satellite sounders, the SCIAMACHY spectrometer suffers from optical degradation due to polymerisation of optical surfaces from the harsh UV radiation in space (e.g. Bramstedt et al., 2009; DeLand et al., 2012; Krijger et al., 2014). In data version 8 of SCIAMACHY a physical model of the scanner unit was implemented to provide a degradation correction (Bramstedt et al., 2009; Krijger et al., 2014). Comparisons with several other established solar reference spectra show agreement to within 4 % in most parts of the visible and near infrared from 350 to 1400 nm.Bericht253 218