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2D-photochemical modeling of Saturn’s stratosphere: hydrocarbon and water distributions

dc.contributor.authorHUE, V.
hal.structure.identifierASP 2014
dc.contributor.authorCAVALIÉ, T.
hal.structure.identifierECLIPSE 2014
dc.contributor.authorHERSANT, F.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
hal.structure.identifierASP 2014
dc.contributor.authorDOBRIJEVIC, M.
hal.structure.identifierSouthwest Research Institute [San Antonio] [SwRI]
dc.contributor.authorGREATHOUSE, Thomas,
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
dc.contributor.authorLELLOUCH, Emmanuel,
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorHARTOGH, Paul,
dc.contributor.authorCASSIDY, Timothy,
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorSPIGA, Aymeric,
dc.contributor.authorGUERLET, Sandrine,
hal.structure.identifierArmand-Frappier Santé Biotechnologie Research Centre [INRS-AFSB]
dc.contributor.authorSYLVESTRE, Melody,
dc.date.issued2014-11
dc.date.conference2014-11-09
dc.description.abstractEnSaturn’s axial tilt of 27° produces seasons in a similar way as on Earth. The seasonal forcing over Saturn’s 30 years period influences the production/loss of the major atmospheric absorbers and coolants through photochemistry, and influences therefore Saturn’s stratospheric temperatures. We have developed a 2D time-dependent photochemical model of Saturn’s atmosphere [Hue et al., in prep.], coupled to a radiative-climate model [Greathouse et al., 2008] to study seasonal effects on its atmospheric composition. Cassini spacecraft has revealed that the distribution of hydrocarbons in Saturn’s stratosphere [Guerlet et al., 2009] differs from pure photochemical predictions, i.e. without meridional transport [Moses et al., 2005]. Differences between the observed distribution of hydrocarbons and 2D-photochemical predictions are likely to be an indicator of dynamical forcing.Disentangling the origin of water in the stratosphere of this planet has been a long-term issue. Due to Saturn’s cold tropopause trap, which acts as a transport barrier, the water vapor observed by the Infrared Space Observatory (ISO) [Feuchtgruber et al., 1997] has an external origin. Three external sources have been identified: (i) permanent flux from interplanetary dust particles, (ii) local sources form planetary environments (rings, satellites), (iii) large cometary impacts, similar to Shoemaker-Levy 9 on Jupiter. Previous observations of Saturn with Herschel’s Hsso program [Hartogh et al., 2009] led to the detection of a water torus around Saturn [Hartogh et al., 2011], fed by Enceladus’ geysers. A substantial fraction of this torus is predicted to be a local source of water for Saturn’s and its satellites, as it will spread in this system [Cassidy et al., 2010]. Using the new 2D-photochemical model, we test here the validity of Enceladus’ torus as the source of Saturn’s stratospheric water.References : Hue et al., in prep. Greathouse et al., 2008. AGU Fall Meeting(Abstract P21B06). Guerlet et al., 2009. Icarus, 203, 214-232. Moses et al., 2005. JGR 110. Feuchtgruber et al., 1997. 389, 159-162. Hartogh et al., 2009. PSS 57, 1596-1606 Hartogh et al., 2011. A&A, 532, L2. Cassidy et al., 2010. Icarus, 209, 696-703
dc.language.isoen
dc.title.en2D-photochemical modeling of Saturn’s stratosphere: hydrocarbon and water distributions
dc.typeCommunication dans un congrès
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.page#508.08
bordeaux.volume46
bordeaux.conference.titleAmerican Astronomical Society, DPS meeting #46, #508.08 - 2014, held in Tucson (USA) 2014-11-09
bordeaux.countryUS
bordeaux.conference.cityTucson
bordeaux.peerReviewednon
hal.identifierhal-01082264
hal.version1
hal.invitednon
hal.proceedingsnon
hal.conference.end2014-11-14
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01082264v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2014-11&rft.volume=46&rft.spage=%23508.08&rft.epage=%23508.08&rft.au=HUE,%20V.&CAVALI%C3%89,%20T.&HERSANT,%20F.&DOBRIJEVIC,%20M.&GREATHOUSE,%20Thomas,&rft.genre=unknown


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