A new approach for simulating the paleo-evolution of the Northern Hemisphere ice sheets
Offline forcing methods for ice-sheet models often make use of an index approach in which temperature anomalies relative to the present are calculated by combining a simulated glacial–interglacial climatic anomaly field, interpolated through an index derived from the Greenland ice-core temperature r...
Published in: | Geoscientific Model Development |
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2018
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Online Access: | http://hdl.handle.net/10261/186530 https://doi.org/10.5194/gmd-11-2299-2018 https://doi.org/10.13039/501100003176 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100002911 |
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ftcsic:oai:digital.csic.es:10261/186530 2024-02-11T10:04:27+01:00 A new approach for simulating the paleo-evolution of the Northern Hemisphere ice sheets Banderas, Rubén Álvarez-Solas, J. Robinson, Alexander Montoya, Marisa Ministerio de Economía y Competitividad (España) Universidad Complutense de Madrid European Commission Campus de Excelencia Internacional Moncloa Ministerio de Educación, Cultura y Deporte (España) Ministerio de Ciencia, Innovación y Universidades (España) Robinson, Alexander 2018-06-19 http://hdl.handle.net/10261/186530 https://doi.org/10.5194/gmd-11-2299-2018 https://doi.org/10.13039/501100003176 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100002911 en eng European Geosciences Union #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2014-59384-R info:eu-repo/grantAgreement/EC/H2020/703251 Publisher's version https://doi.org/10.5194/gmd-11-2299-2018 Sí Geoscientific Model Development 11: 2299-2314 (2018) 1991-959X http://hdl.handle.net/10261/186530 doi:10.5194/gmd-11-2299-2018 1991-9603 http://dx.doi.org/10.13039/501100003176 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100002911 open artículo http://purl.org/coar/resource_type/c_6501 2018 ftcsic https://doi.org/10.5194/gmd-11-2299-201810.13039/50110000317610.13039/50110000332910.13039/50110000078010.13039/501100002911 2024-01-16T10:41:33Z Offline forcing methods for ice-sheet models often make use of an index approach in which temperature anomalies relative to the present are calculated by combining a simulated glacial–interglacial climatic anomaly field, interpolated through an index derived from the Greenland ice-core temperature reconstruction, with present-day climatologies. An important drawback of this approach is that it clearly misrepresents climate variability at millennial timescales. The reason for this is that the spatial glacial–interglacial anomaly field used is associated with orbital climatic variations, while it is scaled following the characteristic time evolution of the index, which includes orbital and millennial-scale climate variability. The spatial patterns of orbital and millennial variability are clearly not the same, as indicated by a wealth of models and data. As a result, this method can be expected to lead to a misrepresentation of climate variability and thus of the past evolution of Northern Hemisphere (NH) ice sheets. Here we illustrate the problems derived from this approach and propose a new offline climate forcing method that attempts to better represent the characteristic pattern of millennial-scale climate variability by including an additional spatial anomaly field associated with this timescale. To this end, three different synthetic transient forcing climatologies are developed for the past 120 kyr following a perturbative approach and are applied to an ice-sheet model. The impact of the climatologies on the paleo-evolution of the NH ice sheets is evaluated. The first method follows the usual index approach in which temperature anomalies relative to the present are calculated by combining a simulated glacial–interglacial climatic anomaly field, interpolated through an index derived from ice-core data, with present-day climatologies. In the second approach the representation of millennial-scale climate variability is improved by incorporating a simulated stadial–interstadial anomaly field. The third is a ... Article in Journal/Newspaper Greenland Greenland ice core ice core Ice Sheet Digital.CSIC (Spanish National Research Council) Greenland Geoscientific Model Development 11 6 2299 2314 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
Offline forcing methods for ice-sheet models often make use of an index approach in which temperature anomalies relative to the present are calculated by combining a simulated glacial–interglacial climatic anomaly field, interpolated through an index derived from the Greenland ice-core temperature reconstruction, with present-day climatologies. An important drawback of this approach is that it clearly misrepresents climate variability at millennial timescales. The reason for this is that the spatial glacial–interglacial anomaly field used is associated with orbital climatic variations, while it is scaled following the characteristic time evolution of the index, which includes orbital and millennial-scale climate variability. The spatial patterns of orbital and millennial variability are clearly not the same, as indicated by a wealth of models and data. As a result, this method can be expected to lead to a misrepresentation of climate variability and thus of the past evolution of Northern Hemisphere (NH) ice sheets. Here we illustrate the problems derived from this approach and propose a new offline climate forcing method that attempts to better represent the characteristic pattern of millennial-scale climate variability by including an additional spatial anomaly field associated with this timescale. To this end, three different synthetic transient forcing climatologies are developed for the past 120 kyr following a perturbative approach and are applied to an ice-sheet model. The impact of the climatologies on the paleo-evolution of the NH ice sheets is evaluated. The first method follows the usual index approach in which temperature anomalies relative to the present are calculated by combining a simulated glacial–interglacial climatic anomaly field, interpolated through an index derived from ice-core data, with present-day climatologies. In the second approach the representation of millennial-scale climate variability is improved by incorporating a simulated stadial–interstadial anomaly field. The third is a ... |
author2 |
Ministerio de Economía y Competitividad (España) Universidad Complutense de Madrid European Commission Campus de Excelencia Internacional Moncloa Ministerio de Educación, Cultura y Deporte (España) Ministerio de Ciencia, Innovación y Universidades (España) Robinson, Alexander |
format |
Article in Journal/Newspaper |
author |
Banderas, Rubén Álvarez-Solas, J. Robinson, Alexander Montoya, Marisa |
spellingShingle |
Banderas, Rubén Álvarez-Solas, J. Robinson, Alexander Montoya, Marisa A new approach for simulating the paleo-evolution of the Northern Hemisphere ice sheets |
author_facet |
Banderas, Rubén Álvarez-Solas, J. Robinson, Alexander Montoya, Marisa |
author_sort |
Banderas, Rubén |
title |
A new approach for simulating the paleo-evolution of the Northern Hemisphere ice sheets |
title_short |
A new approach for simulating the paleo-evolution of the Northern Hemisphere ice sheets |
title_full |
A new approach for simulating the paleo-evolution of the Northern Hemisphere ice sheets |
title_fullStr |
A new approach for simulating the paleo-evolution of the Northern Hemisphere ice sheets |
title_full_unstemmed |
A new approach for simulating the paleo-evolution of the Northern Hemisphere ice sheets |
title_sort |
new approach for simulating the paleo-evolution of the northern hemisphere ice sheets |
publisher |
European Geosciences Union |
publishDate |
2018 |
url |
http://hdl.handle.net/10261/186530 https://doi.org/10.5194/gmd-11-2299-2018 https://doi.org/10.13039/501100003176 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100002911 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core Ice Sheet |
genre_facet |
Greenland Greenland ice core ice core Ice Sheet |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2014-59384-R info:eu-repo/grantAgreement/EC/H2020/703251 Publisher's version https://doi.org/10.5194/gmd-11-2299-2018 Sí Geoscientific Model Development 11: 2299-2314 (2018) 1991-959X http://hdl.handle.net/10261/186530 doi:10.5194/gmd-11-2299-2018 1991-9603 http://dx.doi.org/10.13039/501100003176 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100002911 |
op_rights |
open |
op_doi |
https://doi.org/10.5194/gmd-11-2299-201810.13039/50110000317610.13039/50110000332910.13039/50110000078010.13039/501100002911 |
container_title |
Geoscientific Model Development |
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11 |
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6 |
container_start_page |
2299 |
op_container_end_page |
2314 |
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1790601046714744832 |