Impact of instantaneous sea ice removal in a coupled general circulation model
Identifieur interne : 000D84 ( Istex/Curation ); précédent : 000D83; suivant : 000D85Impact of instantaneous sea ice removal in a coupled general circulation model
Auteurs : D. Schröder [Royaume-Uni, Allemagne] ; W. M. Connolley [Royaume-Uni]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2007-07.
Abstract
The impact of extreme sea ice initial conditions on modelled climate is analysed for a fully coupled atmosphere ocean sea ice general circulation model, the Hadley Centre climate model HadCM3. A control run is chosen as reference experiment with greenhouse gas concentration fixed at pre‐industrial conditions. Sensitivity experiments show an almost complete recovery from total removal or strong increase of sea ice after four years. Thus, uncertainties in initial sea ice conditions seem to be unimportant for climate modelling on decadal or longer time scales. When the initial conditions of the ocean mixed layer were adjusted to ice‐free conditions, a few substantial differences remained for more than 15 model years. But these differences are clearly smaller than the uncertainty of the HadCM3 run and all the other 19 IPCC fourth assessment report climate model pre‐industrial runs. It is an important task to improve climate models in simulating the past sea ice variability to enable them to make reliable projections for the 21st century.
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DOI: 10.1029/2007GL030253
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Schröder</name><affiliation wicri:level="1"><mods:affiliation>British Antarctic Survey, Natural Environment Research Council, Cambridge, UK</mods:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>British Antarctic Survey, Natural Environment Research Council, Cambridge</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Now at University of Trier, Department of Environmental Meteorology, Faculty of Geoscience, Trier, Germany.</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Now at University of Trier, Department of Environmental Meteorology, Faculty of Geoscience, Trier</wicri:regionArea></affiliation></author><author><name sortKey="Connolley, W M" sort="Connolley, W M" uniqKey="Connolley W" first="W. M." last="Connolley">W. M. 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Lett.</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2007-07">2007-07</date><biblScope unit="volume">34</biblScope><biblScope unit="issue">14</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0094-8276</idno></series><idno type="istex">4A508849C1919F70B9888BF22B455F17A94E743D</idno><idno type="DOI">10.1029/2007GL030253</idno><idno type="ArticleID">2007GL030253</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">The impact of extreme sea ice initial conditions on modelled climate is analysed for a fully coupled atmosphere ocean sea ice general circulation model, the Hadley Centre climate model HadCM3. A control run is chosen as reference experiment with greenhouse gas concentration fixed at pre‐industrial conditions. Sensitivity experiments show an almost complete recovery from total removal or strong increase of sea ice after four years. Thus, uncertainties in initial sea ice conditions seem to be unimportant for climate modelling on decadal or longer time scales. When the initial conditions of the ocean mixed layer were adjusted to ice‐free conditions, a few substantial differences remained for more than 15 model years. But these differences are clearly smaller than the uncertainty of the HadCM3 run and all the other 19 IPCC fourth assessment report climate model pre‐industrial runs. It is an important task to improve climate models in simulating the past sea ice variability to enable them to make reliable projections for the 21st century.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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