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DIFFERENCES IN WATER VAPOR RADIATIVE TRANSFER AMONG 1D MODELS CAN SIGNIFICANTLY AFFECT THE INNER EDGE OF THE HABITABLE ZONE

hal.structure.identifierDepartment of Physiology, University of Pennsylvania
dc.contributor.authorYANG, Jun
hal.structure.identifierECLIPSE 2018
dc.contributor.authorLECONTE, J.
dc.contributor.authorWOLF, Eric T.
dc.contributor.authorGOLDBLATT, Colin
dc.contributor.authorFELDL, Nicole
hal.structure.identifierMcGill University = Université McGill [Montréal, Canada]
dc.contributor.authorMERLIS, Timothy
dc.contributor.authorWANG, Yuwei
dc.contributor.authorKOLL, Daniel D. B.
dc.contributor.authorDING, Feng
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorFORGET, Francois
dc.contributor.authorABBOT, Dorian S.
hal.structure.identifierBritish Antarctic Survey [BAS]
dc.contributor.authorWOLF, Eric
dc.contributor.authorKOLL, Daniel
dc.contributor.authorABBOT, Dorian
dc.date.issued2018
dc.identifier.issn2041-8205
dc.description.abstractEnAn accurate estimate of the inner edge of the habitable zone is critical for determining which exoplanets are potentially habitable and for designing future telescopes to observe them. Here, we explore differences in estimating the inner edge among seven one-dimensional (1D) radiative transfer models: two line-by-line codes (SMART and LBLRTM) as well as five band codes (CAM3, CAM4_Wolf, LMDG, SBDART, and AM2) that are currently being used in global climate models. We compare radiative fluxes and spectra in clear-sky conditions around G- and M-stars, with fixed moist adiabatic profiles for surface temperatures from 250 to 360 K. We find that divergences among the models arise mainly from large uncertainties in water vapor absorption in the window region (10 um) and in the region between 0.2 and 1.5 um. Differences in outgoing longwave radiation increase with surface temperature and reach 10-20 Wm^-2; differences in shortwave reach up to 60 Wm^-2, especially at the surface and in the troposphere, and are larger for an M-dwarf spectrum than a solar spectrum. Differences between the two line-by-line models are significant, although smaller than among the band models. Our results imply that the uncertainty in estimating the insolation threshold of the inner edge (the runaway greenhouse limit) due only to clear-sky radiative transfer is ~10% of modern Earth's solar constant (i.e., ~34 Wm^-2 in global mean) among band models and ~3% between the two line-by-line models. These comparisons show that future work is needed focusing on improving water vapor absorption coefficients in both shortwave and longwave, as well as on increasing the resolution of stellar spectra in broadband models.
dc.language.isoen
dc.publisherBristol : IOP Publishing
dc.title.enDIFFERENCES IN WATER VAPOR RADIATIVE TRANSFER AMONG 1D MODELS CAN SIGNIFICANTLY AFFECT THE INNER EDGE OF THE HABITABLE ZONE
dc.typeArticle de revue
dc.identifier.doi10.3847/0004-637X/826/2/222
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv1809.01397
bordeaux.journalThe Astrophysical journal letters
bordeaux.pageen attente
bordeaux.peerReviewedoui
hal.identifierhal-01868916
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01868916v1
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