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Radiative-convective models of the atmospheres of Uranus and Neptune: heating sources and seasonal effects

hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
hal.structure.identifierLaboratoire Atmosphères, Milieux, Observations Spatiales [LATMOS]
dc.contributor.authorMILCARECK, Gwenaël
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorGUERLET, Sandrine
hal.structure.identifierPLANETO - LATMOS
dc.contributor.authorMONTMESSIN, Franck
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorSPIGA, Aymeric
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorLECONTE, Jeremy
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorMILLOUR, Ehouarn
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorCLEMENT, Noe
hal.structure.identifierDepartment of Physics and Astronomy [Leicester]
dc.contributor.authorFLETCHER, Leigh
hal.structure.identifierDepartment of Physics and Astronomy [Leicester]
dc.contributor.authorROMAN, Michael
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorLELLOUCH, Emmanuel
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorMORENO, Raphael
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorCAVALIE, Thibault
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorCARRION-GONZALEZ, Oscar
dc.date.issued2024-03-20
dc.identifier.issn0004-6361
dc.description.abstractEnThe observations made during the Voyager 2 yby have shown that the stratosphere of Uranus and that of Neptune are warmer than expected by previous models. In addition, no seasonal variability of the thermal structure has been observed on Uranus since Voyager 2 era and signi cant subseasonal variations have been revealed on Neptune.Aims. In this paper, we evaluate different realistic heat sources that can induce suf cient heating to warm the atmosphere of these planets and we estimate the seasonal effects on the thermal structure.Methods. The seasonal radiative-convective model developed by the Laboratoire de Météorologie Dynamique was used to reproduce the thermal structure of these planets. Three hypotheses for the heating sources were explored separately: aerosol layers, a higher methane mole fraction, and thermospheric conduction.Results. Our modelling indicates that aerosols with plausible scattering properties can produce the requisite heating for Uranus, but not for Neptune. Alternatively, greater stratospheric methane abundances can provide the missing heating on both planets, but the large values needed are inconsistent with current observational constraints. In contrast, adding thermospheric conduction cannot warm the stratosphere of both planets alone. The combination of these heat sources is also investigated. In the upper troposphere of both planets, the meridional thermal structures produced by our model are found inconsistent with those retrieved from Voyager 2/IRIS data. Furthermore, our models predict seasonal variations should exist within the stratospheres of both planets while observations showed that Uranus seems to be invariant to meridional contrasts and only subseasonal temperature trends are visible on Neptune. However, a warm south pole is seen in our simulations of Neptune as observed since 2003.
dc.description.sponsorshipSimulations et Observations de la dynamique atmosphérique d'Uranus et Neptune
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enradiative transfer, planets and satellites: atmospheres, planets and satellites: gaseous planets
dc.title.enRadiative-convective models of the atmospheres of Uranus and Neptune: heating sources and seasonal effects
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/202348987
dc.subject.halPlanète et Univers [physics]
dc.identifier.arxiv2403.13399
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA103
bordeaux.volume686
bordeaux.peerReviewedoui
hal.identifierinsu-04518319
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-04518319v1
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