Impact of the North Atlantic Oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison
Observational studies based on altimeter data have shown that in many regions of the World Ocean the oceanic eddy kinetic energy (EKE) significantly varies on interannual timescales. Comparing altimeter-based EKE maps for 1993 and 1996, Stammer and Wunsch (1998) discuss a significant meridional redi...
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Online Access: | https://hal.science/hal-00182983 https://hal.science/hal-00182983/document https://hal.science/hal-00182983/file/Impact_of_the_North.pdf https://doi.org/10.1175/JPO2618.1 |
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ftunigrenoble:oai:HAL:hal-00182983v1 2024-05-12T08:07:24+00:00 Impact of the North Atlantic Oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison Penduff, Thierry Barnier, Bernard Dewar, William, K O'Brien, James, J Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Florida State University Tallahassee (FSU) Center for Ocean-Atmospheric Prediction Studies (COAPS) 2004 https://hal.science/hal-00182983 https://hal.science/hal-00182983/document https://hal.science/hal-00182983/file/Impact_of_the_North.pdf https://doi.org/10.1175/JPO2618.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO2618.1 hal-00182983 https://hal.science/hal-00182983 https://hal.science/hal-00182983/document https://hal.science/hal-00182983/file/Impact_of_the_North.pdf doi:10.1175/JPO2618.1 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-00182983 Journal of Physical Oceanography, 2004, 34 (12), pp.2615-2629. ⟨10.1175/JPO2618.1⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2004 ftunigrenoble https://doi.org/10.1175/JPO2618.1 2024-04-18T03:36:08Z Observational studies based on altimeter data have shown that in many regions of the World Ocean the oceanic eddy kinetic energy (EKE) significantly varies on interannual timescales. Comparing altimeter-based EKE maps for 1993 and 1996, Stammer and Wunsch (1998) discuss a significant meridional redistribution of EKE in the North Atlantic and speculated about the possible influence of the NAO cycle. This hypothesis is examined using 7 years of T/P altimeter data and three 1/6 o -resolution Atlantic Ocean model simulations from the French CLIPPER numerical experiment performed over the period 1979-2000. The subpolar-subtropical meridional contrast of EKE actually appears to vary on interannual timescales in the real ocean, and the model reproduces it realistically. The NAO cycle forces the meridional contrast of energy input by the wind. Our analysis suggests that after 1993, the large amplitude of the NAO cycle induces an adjustment of the large-scale circulation (Gulf Stream/North Atlantic Current), of its baroclinically unstable character, and, in turn, of the distribution of EKE. Model results suggest that before 1994, most NAO-like fluctuations were not followed by EKE redistributions, probably because NAO oscillations were weaker. Strong NAO index modulations are followed by gyre-scale EKE fluctuations with a 9-10 months lag, suggesting that complex, nonlinear adjustment processes are involved in this oceanic adjustment. Article in Journal/Newspaper north atlantic current North Atlantic North Atlantic oscillation Université Grenoble Alpes: HAL Journal of Physical Oceanography 34 12 2615 2629 |
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Open Polar |
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Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Penduff, Thierry Barnier, Bernard Dewar, William, K O'Brien, James, J Impact of the North Atlantic Oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
Observational studies based on altimeter data have shown that in many regions of the World Ocean the oceanic eddy kinetic energy (EKE) significantly varies on interannual timescales. Comparing altimeter-based EKE maps for 1993 and 1996, Stammer and Wunsch (1998) discuss a significant meridional redistribution of EKE in the North Atlantic and speculated about the possible influence of the NAO cycle. This hypothesis is examined using 7 years of T/P altimeter data and three 1/6 o -resolution Atlantic Ocean model simulations from the French CLIPPER numerical experiment performed over the period 1979-2000. The subpolar-subtropical meridional contrast of EKE actually appears to vary on interannual timescales in the real ocean, and the model reproduces it realistically. The NAO cycle forces the meridional contrast of energy input by the wind. Our analysis suggests that after 1993, the large amplitude of the NAO cycle induces an adjustment of the large-scale circulation (Gulf Stream/North Atlantic Current), of its baroclinically unstable character, and, in turn, of the distribution of EKE. Model results suggest that before 1994, most NAO-like fluctuations were not followed by EKE redistributions, probably because NAO oscillations were weaker. Strong NAO index modulations are followed by gyre-scale EKE fluctuations with a 9-10 months lag, suggesting that complex, nonlinear adjustment processes are involved in this oceanic adjustment. |
author2 |
Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Florida State University Tallahassee (FSU) Center for Ocean-Atmospheric Prediction Studies (COAPS) |
format |
Article in Journal/Newspaper |
author |
Penduff, Thierry Barnier, Bernard Dewar, William, K O'Brien, James, J |
author_facet |
Penduff, Thierry Barnier, Bernard Dewar, William, K O'Brien, James, J |
author_sort |
Penduff, Thierry |
title |
Impact of the North Atlantic Oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison |
title_short |
Impact of the North Atlantic Oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison |
title_full |
Impact of the North Atlantic Oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison |
title_fullStr |
Impact of the North Atlantic Oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison |
title_full_unstemmed |
Impact of the North Atlantic Oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison |
title_sort |
impact of the north atlantic oscillation on the oceanic eddy flow: dynamical insights from a model-data comparison |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00182983 https://hal.science/hal-00182983/document https://hal.science/hal-00182983/file/Impact_of_the_North.pdf https://doi.org/10.1175/JPO2618.1 |
genre |
north atlantic current North Atlantic North Atlantic oscillation |
genre_facet |
north atlantic current North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-00182983 Journal of Physical Oceanography, 2004, 34 (12), pp.2615-2629. ⟨10.1175/JPO2618.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO2618.1 hal-00182983 https://hal.science/hal-00182983 https://hal.science/hal-00182983/document https://hal.science/hal-00182983/file/Impact_of_the_North.pdf doi:10.1175/JPO2618.1 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JPO2618.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
34 |
container_issue |
12 |
container_start_page |
2615 |
op_container_end_page |
2629 |
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1798850060458393600 |