Global-scale energy and freshwater balance in glacial climate: A comparison of three PMIP2 LGM simulations
Three coupled atmosphere-ocean general circulation model (AOGCM) simulations of the Last Glacial Maximum (I-GM: about 21000 yr before present), conducted under the protocol of the second phase of the Paleoclimate Modelling Intercomparison Project (PMIP2), have been analyzed from a viewpoint of large...
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Online Access: | http://hdl.handle.net/2078.1/36350 https://doi.org/10.1175/2008JCLI2104.1 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:36350 2024-05-12T08:08:08+00:00 Global-scale energy and freshwater balance in glacial climate: A comparison of three PMIP2 LGM simulations Murakami, Shigenori Ohgaito, Rumi Abe-Ouchi, Ayako Crucifix, Michel Otto-Bliesner, Bette L. UCL 2008 http://hdl.handle.net/2078.1/36350 https://doi.org/10.1175/2008JCLI2104.1 eng eng Amer Meteorological Soc boreal:36350 http://hdl.handle.net/2078.1/36350 doi:10.1175/2008JCLI2104.1 urn:ISSN:0894-8755 urn:EISSN:1520-0442 Journal of Climate, Vol. 21, no. 19, p. 5008-5033 (2008) info:eu-repo/semantics/article 2008 ftunivlouvain https://doi.org/10.1175/2008JCLI2104.1 2024-04-17T17:33:35Z Three coupled atmosphere-ocean general circulation model (AOGCM) simulations of the Last Glacial Maximum (I-GM: about 21000 yr before present), conducted under the protocol of the second phase of the Paleoclimate Modelling Intercomparison Project (PMIP2), have been analyzed from a viewpoint of large-scale energy and freshwater balance. Atmospheric latent heat (LH) transport decreases at most latitudes due to reduced water vapour content in the lower troposphere. and dry static energy (DSE) transport in northern midlatitudes increases and changes the intensity contrast between the Pacific and Atlantic regions due to enhanced stationary waves over the North American ice Sheets. In low latitudes. even with an intensified Hadley circulation in the Northern Hemisphere (NH), reduced DSE transport by the mean zonal circulation as well as a reduced equatorward LH transport is observed. The oceanic heat transport at NH midlatitudes increases owing to intensified subpolar gyres, and the Atlantic heat transport at low latitudes increases in all models whether or not meridional overturning circulation (MOC) intensifies. As a result, total poleward energy transport at the LGM increases in NH mid- and low latitudes in all models. Oceanic freshwater transport decreases. compensating for the response of the atmospheric water vapor transport. These responses in the atmosphere and ocean make the northern North Atlantic Ocean cold and relatively fresh. and the Southern Ocean relatively warm and saline. This is a common and robust feature in all odels. The resultant ocean densities and ocean MOC response. however. show model dependency. Article in Journal/Newspaper North Atlantic Southern Ocean DIAL@UCLouvain (Université catholique de Louvain) Southern Ocean Pacific Journal of Climate 21 19 5008 5033 |
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Open Polar |
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DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
description |
Three coupled atmosphere-ocean general circulation model (AOGCM) simulations of the Last Glacial Maximum (I-GM: about 21000 yr before present), conducted under the protocol of the second phase of the Paleoclimate Modelling Intercomparison Project (PMIP2), have been analyzed from a viewpoint of large-scale energy and freshwater balance. Atmospheric latent heat (LH) transport decreases at most latitudes due to reduced water vapour content in the lower troposphere. and dry static energy (DSE) transport in northern midlatitudes increases and changes the intensity contrast between the Pacific and Atlantic regions due to enhanced stationary waves over the North American ice Sheets. In low latitudes. even with an intensified Hadley circulation in the Northern Hemisphere (NH), reduced DSE transport by the mean zonal circulation as well as a reduced equatorward LH transport is observed. The oceanic heat transport at NH midlatitudes increases owing to intensified subpolar gyres, and the Atlantic heat transport at low latitudes increases in all models whether or not meridional overturning circulation (MOC) intensifies. As a result, total poleward energy transport at the LGM increases in NH mid- and low latitudes in all models. Oceanic freshwater transport decreases. compensating for the response of the atmospheric water vapor transport. These responses in the atmosphere and ocean make the northern North Atlantic Ocean cold and relatively fresh. and the Southern Ocean relatively warm and saline. This is a common and robust feature in all odels. The resultant ocean densities and ocean MOC response. however. show model dependency. |
author2 |
UCL |
format |
Article in Journal/Newspaper |
author |
Murakami, Shigenori Ohgaito, Rumi Abe-Ouchi, Ayako Crucifix, Michel Otto-Bliesner, Bette L. |
spellingShingle |
Murakami, Shigenori Ohgaito, Rumi Abe-Ouchi, Ayako Crucifix, Michel Otto-Bliesner, Bette L. Global-scale energy and freshwater balance in glacial climate: A comparison of three PMIP2 LGM simulations |
author_facet |
Murakami, Shigenori Ohgaito, Rumi Abe-Ouchi, Ayako Crucifix, Michel Otto-Bliesner, Bette L. |
author_sort |
Murakami, Shigenori |
title |
Global-scale energy and freshwater balance in glacial climate: A comparison of three PMIP2 LGM simulations |
title_short |
Global-scale energy and freshwater balance in glacial climate: A comparison of three PMIP2 LGM simulations |
title_full |
Global-scale energy and freshwater balance in glacial climate: A comparison of three PMIP2 LGM simulations |
title_fullStr |
Global-scale energy and freshwater balance in glacial climate: A comparison of three PMIP2 LGM simulations |
title_full_unstemmed |
Global-scale energy and freshwater balance in glacial climate: A comparison of three PMIP2 LGM simulations |
title_sort |
global-scale energy and freshwater balance in glacial climate: a comparison of three pmip2 lgm simulations |
publisher |
Amer Meteorological Soc |
publishDate |
2008 |
url |
http://hdl.handle.net/2078.1/36350 https://doi.org/10.1175/2008JCLI2104.1 |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Journal of Climate, Vol. 21, no. 19, p. 5008-5033 (2008) |
op_relation |
boreal:36350 http://hdl.handle.net/2078.1/36350 doi:10.1175/2008JCLI2104.1 urn:ISSN:0894-8755 urn:EISSN:1520-0442 |
op_doi |
https://doi.org/10.1175/2008JCLI2104.1 |
container_title |
Journal of Climate |
container_volume |
21 |
container_issue |
19 |
container_start_page |
5008 |
op_container_end_page |
5033 |
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1798851038272290816 |