The importance of insolation changes for paleo ice sheet modeling

The growth and retreat of continental ice sheets in the past has largely been a response to changing climatic forcing. Since ablation is the principal component of mass loss for land-based ice sheets, the calculation of surface melt is an important aspect of paleo ice sheet modeling. Changes in inso...

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Detalles Bibliográficos
Autores: Robinson, Alexander, Goelzer, H.
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/101919
Acceso en línea:http://hdl.handle.net/10261/101919
Access Level:acceso abierto
Palabra clave:Paleoclimatología
Palaeoclimatology
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spelling The importance of insolation changes for paleo ice sheet modelingRobinson, AlexanderGoelzer, H.PaleoclimatologíaPalaeoclimatologyThe growth and retreat of continental ice sheets in the past has largely been a response to changing climatic forcing. Since ablation is the principal component of mass loss for land-based ice sheets, the calculation of surface melt is an important aspect of paleo ice sheet modeling. Changes in insolation are often not accounted for in calculations of surface melt, under the assumption that the near-surface temperature transmits the majority of the climatic forcing to the ice sheet. To assess how this could affect paleo simulations, here we investigate the importance of different orbital configurations for estimating melt on the Greenland ice sheet. We find that during peak Eemian conditions, increased insolation contributes 20-50% to the surface melt anomaly. However, this percentage depends strongly on the temperature anomaly at the time. For higher temperature anomalies, the role of insolation changes is less important. This relationship is not homogenous over the ice sheet, since the contribution of insolation to melt is modulated by the local surface albedo. In coupled simulations, the additional insolation-induced melt translates into up to threefold more ice volume loss, compared to output using a model that does not account for insolation changes. We also introduce a simple correction factor that allows reduced-complexity melt models to account for changes in insolation. © Author(s) 2014. CC Attribution 3.0 License.Peer ReviewedCopernicus Publications2014201420142014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/101919reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://www.the-cryosphere.net/8/1419/2014/info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1019192026-05-22T06:33:51Z
dc.title.none.fl_str_mv The importance of insolation changes for paleo ice sheet modeling
title The importance of insolation changes for paleo ice sheet modeling
spellingShingle The importance of insolation changes for paleo ice sheet modeling
Robinson, Alexander
Paleoclimatología
Palaeoclimatology
title_short The importance of insolation changes for paleo ice sheet modeling
title_full The importance of insolation changes for paleo ice sheet modeling
title_fullStr The importance of insolation changes for paleo ice sheet modeling
title_full_unstemmed The importance of insolation changes for paleo ice sheet modeling
title_sort The importance of insolation changes for paleo ice sheet modeling
dc.creator.none.fl_str_mv Robinson, Alexander
Goelzer, H.
author Robinson, Alexander
author_facet Robinson, Alexander
Goelzer, H.
author_role author
author2 Goelzer, H.
author2_role author
dc.subject.none.fl_str_mv Paleoclimatología
Palaeoclimatology
topic Paleoclimatología
Palaeoclimatology
description The growth and retreat of continental ice sheets in the past has largely been a response to changing climatic forcing. Since ablation is the principal component of mass loss for land-based ice sheets, the calculation of surface melt is an important aspect of paleo ice sheet modeling. Changes in insolation are often not accounted for in calculations of surface melt, under the assumption that the near-surface temperature transmits the majority of the climatic forcing to the ice sheet. To assess how this could affect paleo simulations, here we investigate the importance of different orbital configurations for estimating melt on the Greenland ice sheet. We find that during peak Eemian conditions, increased insolation contributes 20-50% to the surface melt anomaly. However, this percentage depends strongly on the temperature anomaly at the time. For higher temperature anomalies, the role of insolation changes is less important. This relationship is not homogenous over the ice sheet, since the contribution of insolation to melt is modulated by the local surface albedo. In coupled simulations, the additional insolation-induced melt translates into up to threefold more ice volume loss, compared to output using a model that does not account for insolation changes. We also introduce a simple correction factor that allows reduced-complexity melt models to account for changes in insolation. © Author(s) 2014. CC Attribution 3.0 License.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014
2014
2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
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dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/101919
url http://hdl.handle.net/10261/101919
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://www.the-cryosphere.net/8/1419/2014/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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