Burrows, John P.
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Preferred name
Burrows, John P.
Official Name
Burrows, John P.
Alternative Name
Burrows, John Philip
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GND
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Item-typ:Veröffentlichung, WF-DOAS Algorithm Theoretical Basis DocumentA novel total ozone retrieval algorithm that we call weighting function DOAS has been successfully implemented as an alternative approach to the standard DOAS differential optical absorption spectroscopy) that is currently operational in the GOME retrieval Gome Data Processor Version 3.0). The weighting function DOAS method, abbreviated WF-DOAS, attempts to fit the vertical column density directly from the differential optical depth spectra and it can be applied to strong and weak absorption. This method has been demonstrated to be applicable to near-infrared trace gas column retrieval with CIAMACHY and it has been adapted for total ozone retrieval in the near UV region. The processing of the GOME data is done in a non-linear least squares fitting using look-up-tables of reference intensities, weighting functions, and Ring spectra derived from the multiple scattering radiative transfer model SCIATRAN/CDI. Particular attention has been placed on proper modeling of the Ring effect that show significant dependence on the ozone profile shape due to molecular (ozone) filling-in. Other geophysical parameters such as effective albedo, cloud-top-height, cloud fraction, and effective height that are retrieved from GOME spectral information are used for the first time in combination to improve the ozone retrieval.BerichtHeft:Issue 1.2225 114 - 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.Bericht254 219