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Bathymetry and absorptivity of Titan's Ontario Lacus

hal.structure.identifierDivision of Geological and Planetary Sciences [Pasadena]
dc.contributor.authorHAYES, A. G.
hal.structure.identifierDivision of Geological and Planetary Sciences [Pasadena]
dc.contributor.authorWOLF, A. S.
hal.structure.identifierDivision of Geological and Planetary Sciences [Pasadena]
dc.contributor.authorAHARONSON, O.
hal.structure.identifierDepartment of Electrical Engineering [Stanford]
dc.contributor.authorZEBKER, H.
hal.structure.identifierLunar and Planetary Laboratory [Tucson] [LPL]
dc.contributor.authorLORENZ, R.
hal.structure.identifierUS Geological Survey [Flagstaff]
dc.contributor.authorKIRK, R. L.
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorPAILLOU, Philippe
hal.structure.identifierLunar and Planetary Laboratory [Tucson] [LPL]
dc.contributor.authorLUNINE, J.
hal.structure.identifierStanford University
dc.contributor.authorWYE, L.
hal.structure.identifierCalifornia Institute of Technology [CALTECH]
dc.contributor.authorCALLAHAN, P.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorWALL, S.
hal.structure.identifierCalifornia Institute of Technology [CALTECH]
dc.contributor.authorELACHI, C.
dc.date.issued2010
dc.identifier.issn2169-9097
dc.description.abstractEnOntario Lacus is the largest and best characterized lake in Titan's south polar region. In June and July 2009, the Cassini RADAR acquired its first Synthetic Aperture Radar (SAR) images of the area. Together with closest approach altimetry acquired in December 2008, these observations provide a unique opportunity to study the lake's nearshore bathymetry and complex refractive properties. Average radar backscatter is observed to decrease exponentially with distance from the local shoreline. This behavior is consistent with attenuation through a deepening layer of liquid and, if local topography is known, can be used to derive absorptive dielectric properties. Accordingly, we estimate nearshore topography from a radar altimetry profile that intersects the shoreline on the East and West sides of the lake. We then analyze SAR backscatter in these regions to determine the imaginary component of the liquid's complex index of refraction ($\kappa$). The derived value, $\kappa$ = (6.1‑1.3+1.7) × 10‑4, corresponds to a loss tangent of tan Δ = (9.2‑2.0+2.5) × 10‑4 and is consistent with a composition dominated by liquid hydrocarbons. This value can be used to test compositional models once the microwave optical properties of candidate materials have been measured. In areas that do not intersect altimetry profiles, relative slopes can be calculated assuming the index of refraction is constant throughout the liquid. Accordingly, we construct a coarse bathymetry map for the nearshore region by measuring bathymetric slopes for eleven additional areas around the lake. These slopes vary by a factor of ∼5 and correlate well with observed shoreline morphologies.
dc.language.isoen
dc.publisherWiley-Blackwell
dc.rights.urihttp://hal.archives-ouvertes.fr/licences/copyright/
dc.subject.enPlanetary Sciences: Solar System Objects: Titan
dc.subject.enPlanetary Sciences: Solid Surface Planets: Hydrology and fluvial processes
dc.subject.enPlanetary Sciences: Solid Surface Planets: Surface materials and properties
dc.subject.enPlanetary Sciences: Solid Surface Planets: Remote sensing
dc.subject.enRadio Science: Radio wave propagation
dc.title.enBathymetry and absorptivity of Titan's Ontario Lacus
dc.typeArticle de revue
dc.identifier.doi10.1029/2009JE003557
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géophysique [physics.geo-ph]
bordeaux.journalJournal of Geophysical Research. Planets
bordeaux.page09009
bordeaux.volume115
bordeaux.issueE9
bordeaux.peerReviewedoui
hal.identifierhal-00542726
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00542726v1
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