A Three‐way Balance in The Beaufort Gyre: The Ice‐Ocean Governor, Wind Stress, and Eddy Diffusivity
The Beaufort Gyre (BG) is a large anticyclonic circulation in the Arctic Ocean. Its strength is directly related to the halocline depth, and therefore also to the storage of freshwater. It has recently been proposed that the equilibrium state of the BG is set by the Ice‐Ocean Governor, a negative fe...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hal.science/hal-04202278 https://hal.science/hal-04202278/document https://hal.science/hal-04202278/file/JGR%20Oceans%20-%202019%20-%20Doddridge%20-%20A%20Three%E2%80%90Way%20Balance%20in%20the%20Beaufort%20Gyre%20The%20Ice%E2%80%90Ocean%20Governor%20Wind%20Stress%20and%20Eddy.pdf https://doi.org/10.1029/2018JC014897 |
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ftccsdartic:oai:HAL:hal-04202278v1 2023-12-17T10:25:41+01:00 A Three‐way Balance in The Beaufort Gyre: The Ice‐Ocean Governor, Wind Stress, and Eddy Diffusivity Doddridge, Edward W. Meneghello, Gianluca Marshall, John Scott, Jon Lique, Camille Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2019-05 https://hal.science/hal-04202278 https://hal.science/hal-04202278/document https://hal.science/hal-04202278/file/JGR%20Oceans%20-%202019%20-%20Doddridge%20-%20A%20Three%E2%80%90Way%20Balance%20in%20the%20Beaufort%20Gyre%20The%20Ice%E2%80%90Ocean%20Governor%20Wind%20Stress%20and%20Eddy.pdf https://doi.org/10.1029/2018JC014897 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JC014897 hal-04202278 https://hal.science/hal-04202278 https://hal.science/hal-04202278/document https://hal.science/hal-04202278/file/JGR%20Oceans%20-%202019%20-%20Doddridge%20-%20A%20Three%E2%80%90Way%20Balance%20in%20the%20Beaufort%20Gyre%20The%20Ice%E2%80%90Ocean%20Governor%20Wind%20Stress%20and%20Eddy.pdf doi:10.1029/2018JC014897 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-04202278 Journal of Geophysical Research. Oceans, 2019, 124 (5), pp.3107-3124. ⟨10.1029/2018JC014897⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1029/2018JC014897 2023-11-18T23:42:50Z The Beaufort Gyre (BG) is a large anticyclonic circulation in the Arctic Ocean. Its strength is directly related to the halocline depth, and therefore also to the storage of freshwater. It has recently been proposed that the equilibrium state of the BG is set by the Ice‐Ocean Governor, a negative feedback between surface currents and ice‐ocean stress, rather than a balance between lateral mesoscale eddy fluxes and surface Ekman pumping. However, mesoscale eddies are present in the Arctic Ocean; it is therefore important to extend the Ice‐Ocean Governor theory to include lateral fluxes due to mesoscale eddies. Here, a non‐linear ordinary differential equation is derived that represents the effects of wind stress, the Ice‐Ocean Governor, and eddy fluxes. Equilibrium and time‐varying solutions to this three‐way balance equation are obtained and shown to closely match the output from a hierarchy of numerical simulations, indicating that the analytical model represents the processes controlling BG equilibration. The equilibration timescale derived from this three‐way balance is faster than the eddy equilibration timescale and slower than the Ice‐Ocean Governor equilibration timescales for most values of eddy diffusivity. The sensitivity of the BG equilibrium depth to changes in eddy diffusivity and the presence of the Ice‐Ocean Governor is also explored. These results show that predicting the response of the BG to changing surface forcing and sea ice conditions requires faithfully capturing the three‐way balance between the Ice‐Ocean Governor, wind stress, and eddy fluxes Article in Journal/Newspaper Arctic Arctic Ocean Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Arctic Ocean Journal of Geophysical Research: Oceans 124 5 3107 3124 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Doddridge, Edward W. Meneghello, Gianluca Marshall, John Scott, Jon Lique, Camille A Three‐way Balance in The Beaufort Gyre: The Ice‐Ocean Governor, Wind Stress, and Eddy Diffusivity |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
The Beaufort Gyre (BG) is a large anticyclonic circulation in the Arctic Ocean. Its strength is directly related to the halocline depth, and therefore also to the storage of freshwater. It has recently been proposed that the equilibrium state of the BG is set by the Ice‐Ocean Governor, a negative feedback between surface currents and ice‐ocean stress, rather than a balance between lateral mesoscale eddy fluxes and surface Ekman pumping. However, mesoscale eddies are present in the Arctic Ocean; it is therefore important to extend the Ice‐Ocean Governor theory to include lateral fluxes due to mesoscale eddies. Here, a non‐linear ordinary differential equation is derived that represents the effects of wind stress, the Ice‐Ocean Governor, and eddy fluxes. Equilibrium and time‐varying solutions to this three‐way balance equation are obtained and shown to closely match the output from a hierarchy of numerical simulations, indicating that the analytical model represents the processes controlling BG equilibration. The equilibration timescale derived from this three‐way balance is faster than the eddy equilibration timescale and slower than the Ice‐Ocean Governor equilibration timescales for most values of eddy diffusivity. The sensitivity of the BG equilibrium depth to changes in eddy diffusivity and the presence of the Ice‐Ocean Governor is also explored. These results show that predicting the response of the BG to changing surface forcing and sea ice conditions requires faithfully capturing the three‐way balance between the Ice‐Ocean Governor, wind stress, and eddy fluxes |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Doddridge, Edward W. Meneghello, Gianluca Marshall, John Scott, Jon Lique, Camille |
author_facet |
Doddridge, Edward W. Meneghello, Gianluca Marshall, John Scott, Jon Lique, Camille |
author_sort |
Doddridge, Edward W. |
title |
A Three‐way Balance in The Beaufort Gyre: The Ice‐Ocean Governor, Wind Stress, and Eddy Diffusivity |
title_short |
A Three‐way Balance in The Beaufort Gyre: The Ice‐Ocean Governor, Wind Stress, and Eddy Diffusivity |
title_full |
A Three‐way Balance in The Beaufort Gyre: The Ice‐Ocean Governor, Wind Stress, and Eddy Diffusivity |
title_fullStr |
A Three‐way Balance in The Beaufort Gyre: The Ice‐Ocean Governor, Wind Stress, and Eddy Diffusivity |
title_full_unstemmed |
A Three‐way Balance in The Beaufort Gyre: The Ice‐Ocean Governor, Wind Stress, and Eddy Diffusivity |
title_sort |
three‐way balance in the beaufort gyre: the ice‐ocean governor, wind stress, and eddy diffusivity |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-04202278 https://hal.science/hal-04202278/document https://hal.science/hal-04202278/file/JGR%20Oceans%20-%202019%20-%20Doddridge%20-%20A%20Three%E2%80%90Way%20Balance%20in%20the%20Beaufort%20Gyre%20The%20Ice%E2%80%90Ocean%20Governor%20Wind%20Stress%20and%20Eddy.pdf https://doi.org/10.1029/2018JC014897 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-04202278 Journal of Geophysical Research. Oceans, 2019, 124 (5), pp.3107-3124. ⟨10.1029/2018JC014897⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JC014897 hal-04202278 https://hal.science/hal-04202278 https://hal.science/hal-04202278/document https://hal.science/hal-04202278/file/JGR%20Oceans%20-%202019%20-%20Doddridge%20-%20A%20Three%E2%80%90Way%20Balance%20in%20the%20Beaufort%20Gyre%20The%20Ice%E2%80%90Ocean%20Governor%20Wind%20Stress%20and%20Eddy.pdf doi:10.1029/2018JC014897 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2018JC014897 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
5 |
container_start_page |
3107 |
op_container_end_page |
3124 |
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1785577325032636416 |