On the climatic impact of CO2 ice particles in atmospheres of terrestrial exoplanets

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dc.contributor.authorKitzmann, Daniel
dc.contributor.authorPatzer, A. B. C.
dc.contributor.authorRauer, Heike
dc.date.accessioned2017-11-27T13:14:40Z
dc.date.available2017-11-27T13:14:40Z
dc.date.issued2012
dc.descriptionDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.de
dc.descriptionThis publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.en
dc.description.abstractClouds play a significant role for the energy budget in planetary atmospheres. They can scatter incident stellar radiation back to space, effectively cooling the surface of terrestrial planets. On the other hand, they may contribute to the atmospheric greenhouse effect by trapping outgoing thermal radiation. For exoplanets near the outer boundary of the habitable zone, condensation of CO2 can occur due to the low atmospheric temperatures. These CO2 ice clouds may play an important role for the surface temperature and, therefore, for the question of habitability of those planets. However, the optical properties of CO2 ice crystals differ significantly from those of water droplets or water ice particles. Except for a small number of strong absorption bands, they are almost transparent with respect to absorption. Instead, they are highly effective scatterers at long and short wavelengths. Therefore, the climatic effect of a CO2 ice cloud will depend on how much incident stellar radiation is scattered to space in comparison to the amount of thermal radiation scattered back towards the planetary surface. This contribution aims at the potential greenhouse effect of CO2 ice particles. Their scattering and absorption properties are calculated for assumed particle size distributions with different effective radii and particle densities. An accurate radiative transfer model is used to determine the atmospheric radiation field affected by such CO2 particles. These results are compared to less detailed radiative transfer schemes employed in previous studies.en
dc.identifier.eissn1743-9221
dc.identifier.issn1743-9213
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/7187
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6462
dc.language.isoen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc520 Astronomie und zugeordnete Wissenschaften
dc.subject.ddc526 Mathematische Geografiede
dc.subject.otherplanets and satellitesen
dc.subject.otheratmospheresen
dc.subject.otherscatteringen
dc.subject.otherradiative transferen
dc.titleOn the climatic impact of CO2 ice particles in atmospheres of terrestrial exoplanetsen
dc.typeArticle
dc.type.versionpublishedVersion
dcterms.bibliographicCitation.doi10.1017/s1743921313013045
dcterms.bibliographicCitation.issueS293
dcterms.bibliographicCitation.journaltitleProceedings of the International Astronomical Union
dcterms.bibliographicCitation.originalpublishernameCambridge University Press
dcterms.bibliographicCitation.originalpublisherplaceCambridge
dcterms.bibliographicCitation.pageend308
dcterms.bibliographicCitation.pagestart303
dcterms.bibliographicCitation.volume8
tub.accessrights.dnbdomain
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Zentrum für Astronomie und Astrophysikde
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.instituteZentrum für Astronomie und Astrophysikde
tub.publisher.universityorinstitutionTechnische Universität Berlin

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