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The north polar lakes of Titan as observed by Cassini Radar

hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorMITCHELL, K. L.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorPAILLOU, Philippe
hal.structure.identifierUS Geological Survey [Flagstaff]
dc.contributor.authorKIRK, R. L.
hal.structure.identifierLunar and Planetary Laboratory [Tucson] [LPL]
dc.contributor.authorLUNINE, J.I.
hal.structure.identifierProxemy Research Inc
dc.contributor.authorSTOFAN, E. R.
hal.structure.identifierLunar and Planetary Laboratory [Tucson] [LPL]
dc.contributor.authorRADEBAUGH, J.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorWALL, S. D.
hal.structure.identifierDivision of Geological and Planetary Sciences [Pasadena]
dc.contributor.authorHAYES, A. G.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorLOPES, R. M.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorSTILES, B. W.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorOSTRO, S. J.
hal.structure.identifierJohns Hopkins University Applied Physics Laboratory [Laurel, MD] [APL]
dc.contributor.authorLORENZ, R. D.
hal.structure.identifierWheeling Jesuit University
dc.contributor.authorWOOD, C. A.
dc.contributor.authorCASSINI RADAR TEAM
dc.date.conference2007
dc.description.abstractEnOver the course of a year, Cassini RADAR obtained Synthetic Aperture Radar images covering 69 percent of Titan's polar region north of 65 degrees; the region being 1.4E6 km3 in extent, greater than double the land area of the USA. We observe several hundred lakes with a range of morphological expression, including areally massive and morphologically distinctive "seas", covering ~15% of the polar region. Lakes are extremely radar dark, consistent with a lossy liquid hydrocarbon. Preliminary laboratory estimates suggest that loss tangents in the range 10E4 to 2x10E3 are reasonable, which implies that one can see through at least a few to many tens of m of liquids before the noise floor is reached, consistent with observed brightening towards many lake shores. North polar lake volumes are most likely in the 8E3 - 1.4E6 km3 range. Uncertainties will be reduced as more data, both image-based and experimental, are obtained but we can conclude with a high degree of confidence that hydrocarbon lakes on Titan are more voluminous than known terrestrial oil reserves; current estimates range from 2248 - 3896 billion barrels of oil (J. Hakes, 2000, Long Term World Oil Supply, Meeting of the Am. Ass. Pet. Geol., 18th April 2000, New Orleans, LA, http://www.eia.doe.gov/pub/oil_gas/petroleum/presentations/2000/long_term_supply.), hence 357 - 619 km3 . Small lakes often occupy steep-sided depressions, and although thermal and cryovolcanic origins cannot be completely ruled out, we are seeing growing geomorphologic evidence for dissolution chemistry, indicative of karst-like geology. The dichotomy between small lakes over slightly more than one half of the region, and seas on the other half, may be best explained by a topographic anomaly causing sub-surface flow of materials from the lakes to the seas. This may also explain observations by the Cassini ISS team (E. Turtle et al., in prep.) of a putative massive sea extending considerably further south than other observed north polar lakes.
dc.language.isoen
dc.subject.en9345 Large bodies of water (e.g.
dc.subject.en2400 IONOSPHERE (6929)
dc.subject.en2419 Ion chemistry and composition (0335)
dc.subject.en9345 Large bodies of water (e.g
dc.subject.enlakes and inland seas) (0746)
dc.title.enThe north polar lakes of Titan as observed by Cassini Radar
dc.typeCommunication dans un congrès
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.countryFR
bordeaux.peerReviewedoui
hal.identifierhal-00405463
hal.version1
hal.invitednon
hal.proceedingsnon
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00405463v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=MITCHELL,%20K.%20L.&PAILLOU,%20Philippe&KIRK,%20R.%20L.&LUNINE,%20J.I.&STOFAN,%20E.%20R.&rft.genre=unknown


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