VIRTIS on Venus Express: retrieval of real surface emissivity on global scales

Gabriele E. Arnold; David Kappel; Rainer Haus; Laura Telléz Pedroza; Giuseppe Piccioni; Pierre Drossart

doi:10.1117/12.2186619

1 September 2015 VIRTIS on Venus Express: retrieval of real surface emissivity on global scales

Gabriele E. Arnold, David Kappel, Rainer Haus, Laura Telléz Pedroza, Giuseppe Piccioni, Pierre Drossart

Author Affiliations +

Proceedings Volume 9608, Infrared Remote Sensing and Instrumentation XXIII; 960806 (2015) https://doi.org/10.1117/12.2186619
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

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.

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Gabriele E. Arnold, David Kappel, Rainer Haus, Laura Telléz Pedroza, Giuseppe Piccioni, and Pierre Drossart "VIRTIS on Venus Express: retrieval of real surface emissivity on global scales", Proc. SPIE 9608, Infrared Remote Sensing and Instrumentation XXIII, 960806 (1 September 2015); https://doi.org/10.1117/12.2186619

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KEYWORDS

Venus

Spectroscopy

Infrared spectroscopy

Thermography

Radiative transfer

Atmospheric modeling

Infrared radiation

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