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Proceedings Paper

VIRTIS on Venus Express: retrieval of real surface emissivity on global scales
Author(s): Gabriele E. Arnold; David Kappel; Rainer Haus; Laura Telléz Pedroza; Giuseppe Piccioni; Pierre Drossart
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Paper Abstract

The extraction of surface emissivity data provides the data base for surface composition analyses and enables to evaluate Venus’ geology. The Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS) aboard ESA’s Venus Express mission measured, inter alia, the nightside thermal emission of Venus in the near infrared atmospheric windows between 1.0 and 1.2 μm. These data can be used to determine information about surface properties on global scales. This requires a sophisticated approach to understand and consider the effects and interferences of different atmospheric and surface parameters influencing the retrieved values. In the present work, results of a new technique for retrieval of the 1.0 – 1.2 μm – surface emissivity are summarized. It includes a Multi-Window Retrieval Technique, a Multi-Spectrum Retrieval technique (MSR), and a detailed reliability analysis. The MWT bases on a detailed radiative transfer model making simultaneous use of information from different atmospheric windows of an individual spectrum. MSR regularizes the retrieval by incorporating available a priori mean values, standard deviations as well as spatial-temporal correlations of parameters to be retrieved. The capability of this method is shown for a selected surface target area. Implications for geologic investigations are discussed. Based on these results, the work draws conclusions for future Venus surface composition analyses on global scales using spectral remote sensing techniques. In that context, requirements for observational scenarios and instrumental performances are investigated, and recommendations are derived to optimize spectral measurements for Venus’ surface studies.

Paper Details

Date Published: 1 September 2015
PDF: 7 pages
Proc. SPIE 9608, Infrared Remote Sensing and Instrumentation XXIII, 960806 (1 September 2015); doi: 10.1117/12.2186619
Show Author Affiliations
Gabriele E. Arnold, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
David Kappel, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Rainer Haus, Westfälische Wilhelms-Univ. Münster (Germany)
Laura Telléz Pedroza, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Univ. Potsdam (Germany)
Giuseppe Piccioni, Istituto di Astrofisica e Planetologia Spaziali (IAPS), INAF (Italy)
Pierre Drossart, Lab. d'Études Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris à Meudon (France)

Published in SPIE Proceedings Vol. 9608:
Infrared Remote Sensing and Instrumentation XXIII
Marija Strojnik Scholl; Gonzalo Páez, Editor(s)

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