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Radiative transfer in the atmosphere of Venus and application to surface emissivity retrieval from VIRTIS/VEX measurements

Haus, Rainer and Arnold, Gabriele (2010) Radiative transfer in the atmosphere of Venus and application to surface emissivity retrieval from VIRTIS/VEX measurements. Planetary and Space Science, 58 (12), pp. 1578-1598. Elsevier. DOI: 10.1016/j.pss.2010.08.001

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Abstract

The radiation measurements of VIRTIS-M-IR (1â��5 �¼m) on Venus Express provide a valuable database for systematic studies of the atmosphere and surface of the Earthâ��s sister planet. The present paper focuses on the investigation of physical parameters that determine the retrieval accuracy of deep atmosphere and surface features of Venus including compositional conditions, continuum absorption effects, and spectroscopic input data required for radiative transfer simulations. The parameter discussion shall serve as a reference for ongoing and future work on methodical and simulation input data improvements. The high variability of the nightside atmospheric and surface emission window radiances with respect to cloud opacity and surface elevation is modeled and discussed in direct comparison with measurements performed over the northern hemisphere. Venus surface elevation is retrieved using the 1.18 and 1.02 �¼m emission windows where radiance ratios are well suited to de-cloud the measurement data. In general, the ratio-based VIRTIS topography is in good agreement with the Magellan topography, but differences occur in localized areas. The paper discusses possible origins of such differences including surface emissivity â��anomaliesâ��. Surface emissivity variations that may be due to changes in the chemical composition (mineralogy) and surface texture are important indicators of the nature of the surface material. Preliminary radiance retrievals along a number of complete northern orbits reveal a trend towards lower values of highland surface emissivity compared to the surrounding lowlands. Already the Magellan radar experiment suggested compositional variations at moderately high altitudes over the tesserae. They probably indicate a more felsic component giving a hint to older surface forming processes.

Item URL in elib:https://elib.dlr.de/68376/
Document Type:Article
Title:Radiative transfer in the atmosphere of Venus and application to surface emissivity retrieval from VIRTIS/VEX measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haus, RainerInstitute for Planetology, Westfälische Wilhelms-Universität, Münster, GermanyUNSPECIFIED
Arnold, Gabrielegabriele.arnold (at) dlr.deUNSPECIFIED
Date:2010
Journal or Publication Title:Planetary and Space Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:58
DOI :10.1016/j.pss.2010.08.001
Page Range:pp. 1578-1598
Publisher:Elsevier
Status:Published
Keywords:Radiative transfer; Planetary atmospheres; Surface materials and properties; Clouds and aerosols; Venus
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Venus Express (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:13 Jan 2011 11:02
Last Modified:12 Dec 2013 21:13

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