A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean
International audience We have developed a new method to accelerate tracer simulations to steady-state in a 3-D global ocean model, run off-line. Using this technique, our simulations for natural 14 C ran 17 times faster when compared to those made with the standard non-accelerated approach. For max...
Published in: | Precambrian Research |
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Main Authors: | , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
1998
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Online Access: | https://hal.science/hal-00772199 https://doi.org/10.1007/S003820050212 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes Aumont, Olivier Orr, James C. Jamous, D. Monfray, Patrick Marti, Olivier Madec, Gurvan A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience We have developed a new method to accelerate tracer simulations to steady-state in a 3-D global ocean model, run off-line. Using this technique, our simulations for natural 14 C ran 17 times faster when compared to those made with the standard non-accelerated approach. For maximum acceleration we wish to initialize the model with tracer fields that are as close as possible to the final equilibrium solution. Our initial tracer fields were derived by judiciously constructing a much faster, lower-resolution (degraded), off-line model from advective and turbulent fields predicted from the parent on-line model, an ocean general circulation model (OGCM). No on-line version of the degraded model exists; it is based entirely on results from the parent OGCM. Degradation was made horizontally over sets of four adjacent grid-cell squares for each vertical layer of the parent model. However, final resolution did not suffer because as a second step, after allowing the degraded model to reach equilibrium, we used its tracer output to re-initialize the parent model (at the original resolution). After re-initialization, the parent model must then be integrated only to a few hundred years before reaching equilibrium. To validate our degradation-integration technique (DEGINT), we compared 14 C results from runs with and without this approach. Differences are less than 10‰ throughout 98.5% of the ocean volume. Predicted natural 14 C appears reasonable over most of the ocean. In the Atlantic, modeled Δ 14 C indicates that as observed, the North Atlantic Deep Water (NADW) fills the deep North Atlantic, and Antartic Intermediate Water (AAIW) infiltrates northward; conversely, simulated Antarctic Bottom Water (AABW) does not penetrate northward beyond the equator as it should. In the Pacific, in surface eastern equatorial waters, the model produces a north-south assymetry similar to that observed; other global ocean models do not, because their resolution is inadequate to resolve equatorial dynamics properly, ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Aumont, Olivier Orr, James C. Jamous, D. Monfray, Patrick Marti, Olivier Madec, Gurvan |
author_facet |
Aumont, Olivier Orr, James C. Jamous, D. Monfray, Patrick Marti, Olivier Madec, Gurvan |
author_sort |
Aumont, Olivier |
title |
A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean |
title_short |
A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean |
title_full |
A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean |
title_fullStr |
A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean |
title_full_unstemmed |
A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean |
title_sort |
degradation approach to accelerate simulations to steady-state in a 3-d tracer transport model of the global ocean |
publisher |
HAL CCSD |
publishDate |
1998 |
url |
https://hal.science/hal-00772199 https://doi.org/10.1007/S003820050212 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic antartic* NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic antartic* NADW North Atlantic Deep Water North Atlantic |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00772199 Climate Dynamics, 1998, 14, pp.101-116. ⟨10.1007/S003820050212⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/S003820050212 hal-00772199 https://hal.science/hal-00772199 BIBCODE: 1998ClDy.14.101A doi:10.1007/S003820050212 |
op_doi |
https://doi.org/10.1007/S003820050212 |
container_title |
Precambrian Research |
container_volume |
309 |
container_start_page |
271 |
op_container_end_page |
289 |
_version_ |
1766272559057207296 |
spelling |
ftunivnantes:oai:HAL:hal-00772199v1 2023-05-15T14:02:21+02:00 A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean Aumont, Olivier Orr, James C. Jamous, D. Monfray, Patrick Marti, Olivier Madec, Gurvan Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 1998 https://hal.science/hal-00772199 https://doi.org/10.1007/S003820050212 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/S003820050212 hal-00772199 https://hal.science/hal-00772199 BIBCODE: 1998ClDy.14.101A doi:10.1007/S003820050212 ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-00772199 Climate Dynamics, 1998, 14, pp.101-116. ⟨10.1007/S003820050212⟩ [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 1998 ftunivnantes https://doi.org/10.1007/S003820050212 2023-01-17T23:43:51Z International audience We have developed a new method to accelerate tracer simulations to steady-state in a 3-D global ocean model, run off-line. Using this technique, our simulations for natural 14 C ran 17 times faster when compared to those made with the standard non-accelerated approach. For maximum acceleration we wish to initialize the model with tracer fields that are as close as possible to the final equilibrium solution. Our initial tracer fields were derived by judiciously constructing a much faster, lower-resolution (degraded), off-line model from advective and turbulent fields predicted from the parent on-line model, an ocean general circulation model (OGCM). No on-line version of the degraded model exists; it is based entirely on results from the parent OGCM. Degradation was made horizontally over sets of four adjacent grid-cell squares for each vertical layer of the parent model. However, final resolution did not suffer because as a second step, after allowing the degraded model to reach equilibrium, we used its tracer output to re-initialize the parent model (at the original resolution). After re-initialization, the parent model must then be integrated only to a few hundred years before reaching equilibrium. To validate our degradation-integration technique (DEGINT), we compared 14 C results from runs with and without this approach. Differences are less than 10‰ throughout 98.5% of the ocean volume. Predicted natural 14 C appears reasonable over most of the ocean. In the Atlantic, modeled Δ 14 C indicates that as observed, the North Atlantic Deep Water (NADW) fills the deep North Atlantic, and Antartic Intermediate Water (AAIW) infiltrates northward; conversely, simulated Antarctic Bottom Water (AABW) does not penetrate northward beyond the equator as it should. In the Pacific, in surface eastern equatorial waters, the model produces a north-south assymetry similar to that observed; other global ocean models do not, because their resolution is inadequate to resolve equatorial dynamics properly, ... Article in Journal/Newspaper Antarc* Antarctic antartic* NADW North Atlantic Deep Water North Atlantic Université de Nantes: HAL-UNIV-NANTES Antarctic Pacific Precambrian Research 309 271 289 |