Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2577
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dc.contributor.authorallCagnazzo, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italiaen
dc.contributor.authorallManzini, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italiaen
dc.contributor.authorallGiorgetta, M. A.; Max Planck Institute for Meteorology, Hamburg, Germanyen
dc.contributor.authorallForster, P. M. F.; School of Earth and Environment, University of Leeds, UKen
dc.date.accessioned2007-10-09T07:35:35Zen
dc.date.available2007-10-09T07:35:35Zen
dc.date.issued2006en
dc.identifier.urihttp://hdl.handle.net/2122/2577en
dc.description.abstractIn order to improve the representation of the shortwave radiative transfer in the MAECHAM5 general circulation model, the spectral resolution of the shortwave radiation parameterization used in the model has been increased and extended in the UV-B and UV-C bands. The upgraded shortwave parameterization is first validated offline with a 4 stream discrete-ordinate line-by-line model. Thereafter, two 20-years simulations with the MAECHAM5 middle atmosphere general circulation model are performed to evaluate the temperature changes and the dynamical feedbacks arising from the newly introduced parameterization. The offline clear-sky comparison of the standard and upgraded parameterizations with the discrete ordinate model shows considerable improvement for the upgraded parameterization in terms of shortwave fluxes and heating rates. In the simulation with the upgraded ratiation parameterization, we report a significant warming of almost the entire atmosphere, largest at 1 hPa at the stratopause, and stronger zonal mean zonal winds in the middle atmosphere. The warming at the summer stratopause alleviates the cold bias present in the model when the standard radiation scheme is used. The stronger zonal mean zonal winds induce a dynamical feedback that results in a dynamical warming (cooling) of the polar winter (summer) mesosphere, caused by an increased downward (upward)circulation in the winter (summer) hemisphere. In the troposphere, the changes in the spectral resolution and the associated changes in the cloud optical parameters introduce a relatively small warming and, consistenly, a moisteneing. The warming occurs mostly in the upper troposphere and can contribute to a possible improvement of the model temperature climatology.en
dc.language.isoEnglishen
dc.relation.ispartofAtmospheric Chemistry and Physics Discussionsen
dc.relation.ispartofseries/ 6 (2006)en
dc.subjectradiationen
dc.subjectCirculationen
dc.subjectModelen
dc.titleImpact of an improved radiation scheme in the MAECHAM5 General Circulation Modelen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber11067–11092en
dc.subject.INGV01. Atmosphere::01.01. Atmosphere::01.01.05. Radiationen
dc.description.fulltextopenen
dc.contributor.authorCagnazzo, C.en
dc.contributor.authorManzini, E.en
dc.contributor.authorGiorgetta, M. A.en
dc.contributor.authorForster, P. M. F.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italiaen
dc.contributor.departmentMax Planck Institute for Meteorology, Hamburg, Germanyen
dc.contributor.departmentSchool of Earth and Environment, University of Leeds, UKen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia-
crisitem.author.deptMax Planck Institute for Meteorology, Hamburg, Germany-
crisitem.author.deptSchool of Earth and Environment, University of Leeds, UK-
crisitem.author.orcid0000-0002-2054-0448-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent01. Atmosphere-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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