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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ftawi:oai:epic.awi.de:44368 2024-09-15T18:19:01+00:00 Dynamical reconstruction of the global ocean state during the Last Glacial Maximum Kurahashi-Nakamura, Takasumi Paul, André Losch, Martin 2017-04-11 application/pdf https://epic.awi.de/id/eprint/44368/ https://epic.awi.de/id/eprint/44368/1/kurahashi-nakamura-etal_revised2.pdf https://doi.org/10.1002/2016PA003001 https://hdl.handle.net/10013/epic.50736 https://hdl.handle.net/10013/epic.50736.d001 unknown Wiley https://epic.awi.de/id/eprint/44368/1/kurahashi-nakamura-etal_revised2.pdf https://hdl.handle.net/10013/epic.50736.d001 Kurahashi-Nakamura, T. , Paul, A. and Losch, M. orcid:0000-0002-3824-5244 (2017) Dynamical reconstruction of the global ocean state during the Last Glacial Maximum , Paleoceanography, 32 . doi:10.1002/2016PA003001 <https://doi.org/10.1002/2016PA003001> , hdl:10013/epic.50736 EPIC3Paleoceanography, Wiley, 32, ISSN: 0883-8305 Article isiRev 2017 ftawi https://doi.org/10.1002/2016PA003001 2024-06-24T04:17:43Z 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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Paleoceanography 32 4 326 350 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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, André Losch, Martin |
spellingShingle |
Kurahashi-Nakamura, Takasumi Paul, André Losch, Martin Dynamical reconstruction of the global ocean state during the Last Glacial Maximum |
author_facet |
Kurahashi-Nakamura, Takasumi Paul, André 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 |
Wiley |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/44368/ https://epic.awi.de/id/eprint/44368/1/kurahashi-nakamura-etal_revised2.pdf https://doi.org/10.1002/2016PA003001 https://hdl.handle.net/10013/epic.50736 https://hdl.handle.net/10013/epic.50736.d001 |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
EPIC3Paleoceanography, Wiley, 32, ISSN: 0883-8305 |
op_relation |
https://epic.awi.de/id/eprint/44368/1/kurahashi-nakamura-etal_revised2.pdf https://hdl.handle.net/10013/epic.50736.d001 Kurahashi-Nakamura, T. , Paul, A. and Losch, M. orcid:0000-0002-3824-5244 (2017) Dynamical reconstruction of the global ocean state during the Last Glacial Maximum , Paleoceanography, 32 . doi:10.1002/2016PA003001 <https://doi.org/10.1002/2016PA003001> , hdl:10013/epic.50736 |
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_ |
1810457116085846016 |