A decomposition of the Atlantic Meridional Overturning Circulation into physical components using its sensitivity to vertical diffusivity
International audience The sensitivity of the Atlantic Ocean meridional overturning circulation to the vertical diffusion coefficient in the global coupled atmosphere–ocean–sea ice model CLIMBER-3 is investigated. An important feature of the three-dimensional ocean model is its low-diffusive tracer...
Published in: | Journal of Physical Oceanography |
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Main Authors: | , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2006
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Online Access: | https://hal.science/hal-00164658 https://hal.science/hal-00164658/document https://hal.science/hal-00164658/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20A%20Decomposition%20of%20the%20Atlantic%20Meridional%20Overturning%20Circulation%20into%20Physical%20Components%20Using%20Its%20Sensitivity%20to%20Vertical%20Diffusivity.pdf https://doi.org/10.1175/JPO2891.1 |
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Open Polar |
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Université de Paris: Portail HAL |
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ftunivparis |
language |
English |
topic |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Mignot, Juliette Levermann, Anders Griesel, Alexa A decomposition of the Atlantic Meridional Overturning Circulation into physical components using its sensitivity to vertical diffusivity |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience The sensitivity of the Atlantic Ocean meridional overturning circulation to the vertical diffusion coefficient in the global coupled atmosphere–ocean–sea ice model CLIMBER-3 is investigated. An important feature of the three-dimensional ocean model is its low-diffusive tracer advection scheme. The strength Mmax of the Atlantic overturning is decomposed into three components: 1) the flow MS exported southward at 30°S, 2) the large-scale upward flow that balances vertical diffusion in the Atlantic, and 3) a winddependent upwelling flux Wbound along the Atlantic boundaries that is not due to vertical diffusion. The export of water at 30°S varies only weakly with , but is strongly correlated with the strength of the overflow over the Greenland–Scotland ridge. The location of deep convection is found to be mixing dependent such that a shift from the Nordic seas to the Irminger Sea is detected for high values of . The ratio R MS/Mmax gives a measure of the interhemispheric overturning efficiency and is found to decrease linearly with . The diffusion-induced upwelling in the Atlantic is mostly due to the uniform background value of while parameterization of enhanced mixing over rough topography and in stratified areas gives only a weak contribution to the overturning strength. It increases linearly with . This is consistent with the classic 2/3 scaling law only when taking the linear variation of the density difference to into account. The value of Wbound is roughly constant with but depends linearly on the wind stress strength in the North Atlantic. The pycnocline depth is not sensitive to changes in in the model used herein, and the results suggest that it is primarily set by the forcing of the Southern Ocean winds. The scaling of the total overturning strength with depends on the combined sensitivity of each of the terms to . In the range of background diffusivity values in which no switch in deep convection sites is detected, Mmax scales linearly with the vertical diffusivity. It is argued ... |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-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 Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Potsdam Institute for Climate Impact Research (PIK) |
format |
Article in Journal/Newspaper |
author |
Mignot, Juliette Levermann, Anders Griesel, Alexa |
author_facet |
Mignot, Juliette Levermann, Anders Griesel, Alexa |
author_sort |
Mignot, Juliette |
title |
A decomposition of the Atlantic Meridional Overturning Circulation into physical components using its sensitivity to vertical diffusivity |
title_short |
A decomposition of the Atlantic Meridional Overturning Circulation into physical components using its sensitivity to vertical diffusivity |
title_full |
A decomposition of the Atlantic Meridional Overturning Circulation into physical components using its sensitivity to vertical diffusivity |
title_fullStr |
A decomposition of the Atlantic Meridional Overturning Circulation into physical components using its sensitivity to vertical diffusivity |
title_full_unstemmed |
A decomposition of the Atlantic Meridional Overturning Circulation into physical components using its sensitivity to vertical diffusivity |
title_sort |
decomposition of the atlantic meridional overturning circulation into physical components using its sensitivity to vertical diffusivity |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00164658 https://hal.science/hal-00164658/document https://hal.science/hal-00164658/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20A%20Decomposition%20of%20the%20Atlantic%20Meridional%20Overturning%20Circulation%20into%20Physical%20Components%20Using%20Its%20Sensitivity%20to%20Vertical%20Diffusivity.pdf https://doi.org/10.1175/JPO2891.1 |
genre |
Greenland Greenland-Scotland Ridge Nordic Seas North Atlantic Sea ice Southern Ocean |
genre_facet |
Greenland Greenland-Scotland Ridge Nordic Seas North Atlantic Sea ice Southern Ocean |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-00164658 Journal of Physical Oceanography, 2006, 36 (4), pp.636-650. ⟨10.1175/JPO2891.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO2891.1 hal-00164658 https://hal.science/hal-00164658 https://hal.science/hal-00164658/document https://hal.science/hal-00164658/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20A%20Decomposition%20of%20the%20Atlantic%20Meridional%20Overturning%20Circulation%20into%20Physical%20Components%20Using%20Its%20Sensitivity%20to%20Vertical%20Diffusivity.pdf doi:10.1175/JPO2891.1 IRD: fdi:010080329 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JPO2891.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
36 |
container_issue |
4 |
container_start_page |
636 |
op_container_end_page |
650 |
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1799481089675231232 |
spelling |
ftunivparis:oai:HAL:hal-00164658v1 2024-05-19T07:41:29+00:00 A decomposition of the Atlantic Meridional Overturning Circulation into physical components using its sensitivity to vertical diffusivity Mignot, Juliette Levermann, Anders Griesel, Alexa Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-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 Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Potsdam Institute for Climate Impact Research (PIK) 2006-04 https://hal.science/hal-00164658 https://hal.science/hal-00164658/document https://hal.science/hal-00164658/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20A%20Decomposition%20of%20the%20Atlantic%20Meridional%20Overturning%20Circulation%20into%20Physical%20Components%20Using%20Its%20Sensitivity%20to%20Vertical%20Diffusivity.pdf https://doi.org/10.1175/JPO2891.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO2891.1 hal-00164658 https://hal.science/hal-00164658 https://hal.science/hal-00164658/document https://hal.science/hal-00164658/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20A%20Decomposition%20of%20the%20Atlantic%20Meridional%20Overturning%20Circulation%20into%20Physical%20Components%20Using%20Its%20Sensitivity%20to%20Vertical%20Diffusivity.pdf doi:10.1175/JPO2891.1 IRD: fdi:010080329 info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-00164658 Journal of Physical Oceanography, 2006, 36 (4), pp.636-650. ⟨10.1175/JPO2891.1⟩ [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/article Journal articles 2006 ftunivparis https://doi.org/10.1175/JPO2891.1 2024-04-23T03:39:56Z International audience The sensitivity of the Atlantic Ocean meridional overturning circulation to the vertical diffusion coefficient in the global coupled atmosphere–ocean–sea ice model CLIMBER-3 is investigated. An important feature of the three-dimensional ocean model is its low-diffusive tracer advection scheme. The strength Mmax of the Atlantic overturning is decomposed into three components: 1) the flow MS exported southward at 30°S, 2) the large-scale upward flow that balances vertical diffusion in the Atlantic, and 3) a winddependent upwelling flux Wbound along the Atlantic boundaries that is not due to vertical diffusion. The export of water at 30°S varies only weakly with , but is strongly correlated with the strength of the overflow over the Greenland–Scotland ridge. The location of deep convection is found to be mixing dependent such that a shift from the Nordic seas to the Irminger Sea is detected for high values of . The ratio R MS/Mmax gives a measure of the interhemispheric overturning efficiency and is found to decrease linearly with . The diffusion-induced upwelling in the Atlantic is mostly due to the uniform background value of while parameterization of enhanced mixing over rough topography and in stratified areas gives only a weak contribution to the overturning strength. It increases linearly with . This is consistent with the classic 2/3 scaling law only when taking the linear variation of the density difference to into account. The value of Wbound is roughly constant with but depends linearly on the wind stress strength in the North Atlantic. The pycnocline depth is not sensitive to changes in in the model used herein, and the results suggest that it is primarily set by the forcing of the Southern Ocean winds. The scaling of the total overturning strength with depends on the combined sensitivity of each of the terms to . In the range of background diffusivity values in which no switch in deep convection sites is detected, Mmax scales linearly with the vertical diffusivity. It is argued ... Article in Journal/Newspaper Greenland Greenland-Scotland Ridge Nordic Seas North Atlantic Sea ice Southern Ocean Université de Paris: Portail HAL Journal of Physical Oceanography 36 4 636 650 |