Dynamical reconstruction of the global ocean state during the Last Glacial Maximum
The global ocean state for the modern age and for the Last Glacial Maximum (LGM) was dynamically reconstructed with a sophisticated data assimilation technique. A substantial amount of data including global seawater temperature, salinity (only for the modern estimate), and the isotopic composition o...
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ftarchimer:oai:archimer.ifremer.fr:49466 2023-05-15T17:13:53+02:00 Dynamical reconstruction of the global ocean state during the Last Glacial Maximum Kurahashi-nakamura, Takasumi Paul, Andre Losch, Martin 2017-04 application/pdf https://archimer.ifremer.fr/doc/00383/49466/49951.pdf https://doi.org/10.1002/2016PA003001 https://archimer.ifremer.fr/doc/00383/49466/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00383/49466/49951.pdf doi:10.1002/2016PA003001 https://archimer.ifremer.fr/doc/00383/49466/ 2017. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2017-04 , Vol. 32 , N. 4 , P. 326-350 Last Glacial Maximum ocean circulation AMOC proxy records ocean general circulation model data assimilation text Publication info:eu-repo/semantics/article 2017 ftarchimer https://doi.org/10.1002/2016PA003001 2021-09-23T20:29:28Z The global ocean state for the modern age and for the Last Glacial Maximum (LGM) was dynamically reconstructed with a sophisticated data assimilation technique. A substantial amount of data including global seawater temperature, salinity (only for the modern estimate), and the isotopic composition of oxygen and carbon (only in the Atlantic for the LGM) were integrated into an ocean general circulation model with the help of the adjoint method, thereby the model was optimized to reconstruct plausible continuous fields of tracers, overturning circulation and water mass distribution. The adjoint-based LGM state estimation of this study represents the state of the art in terms of the length of forward model runs, the number of observations assimilated, and the model domain. Compared to the modern state, the reconstructed continuous sea-surface temperature field for the LGM shows a global-mean cooling of 2.2 K, and the reconstructed LGM ocean has a more vigorous Atlantic meridional overturning circulation, shallower North Atlantic Deep Water (NADW) equivalent, stronger stratification, and more saline deep water. Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Paleoceanography 32 4 326 350 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Last Glacial Maximum ocean circulation AMOC proxy records ocean general circulation model data assimilation |
spellingShingle |
Last Glacial Maximum ocean circulation AMOC proxy records ocean general circulation model data assimilation Kurahashi-nakamura, Takasumi Paul, Andre Losch, Martin Dynamical reconstruction of the global ocean state during the Last Glacial Maximum |
topic_facet |
Last Glacial Maximum ocean circulation AMOC proxy records ocean general circulation model data assimilation |
description |
The global ocean state for the modern age and for the Last Glacial Maximum (LGM) was dynamically reconstructed with a sophisticated data assimilation technique. A substantial amount of data including global seawater temperature, salinity (only for the modern estimate), and the isotopic composition of oxygen and carbon (only in the Atlantic for the LGM) were integrated into an ocean general circulation model with the help of the adjoint method, thereby the model was optimized to reconstruct plausible continuous fields of tracers, overturning circulation and water mass distribution. The adjoint-based LGM state estimation of this study represents the state of the art in terms of the length of forward model runs, the number of observations assimilated, and the model domain. Compared to the modern state, the reconstructed continuous sea-surface temperature field for the LGM shows a global-mean cooling of 2.2 K, and the reconstructed LGM ocean has a more vigorous Atlantic meridional overturning circulation, shallower North Atlantic Deep Water (NADW) equivalent, stronger stratification, and more saline deep water. |
format |
Article in Journal/Newspaper |
author |
Kurahashi-nakamura, Takasumi Paul, Andre Losch, Martin |
author_facet |
Kurahashi-nakamura, Takasumi Paul, Andre Losch, Martin |
author_sort |
Kurahashi-nakamura, Takasumi |
title |
Dynamical reconstruction of the global ocean state during the Last Glacial Maximum |
title_short |
Dynamical reconstruction of the global ocean state during the Last Glacial Maximum |
title_full |
Dynamical reconstruction of the global ocean state during the Last Glacial Maximum |
title_fullStr |
Dynamical reconstruction of the global ocean state during the Last Glacial Maximum |
title_full_unstemmed |
Dynamical reconstruction of the global ocean state during the Last Glacial Maximum |
title_sort |
dynamical reconstruction of the global ocean state during the last glacial maximum |
publisher |
Amer Geophysical Union |
publishDate |
2017 |
url |
https://archimer.ifremer.fr/doc/00383/49466/49951.pdf https://doi.org/10.1002/2016PA003001 https://archimer.ifremer.fr/doc/00383/49466/ |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2017-04 , Vol. 32 , N. 4 , P. 326-350 |
op_relation |
https://archimer.ifremer.fr/doc/00383/49466/49951.pdf doi:10.1002/2016PA003001 https://archimer.ifremer.fr/doc/00383/49466/ |
op_rights |
2017. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2016PA003001 |
container_title |
Paleoceanography |
container_volume |
32 |
container_issue |
4 |
container_start_page |
326 |
op_container_end_page |
350 |
_version_ |
1766071083389157376 |