An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation
Author Posting. © American Meteorological Society, 2021. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 51(8),(2021): 2425–2441, https://doi.org/10.1175/JP...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/27718 2023-05-15T17:35:22+02:00 An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation Spall, Michael A. 2021-07-13 https://hdl.handle.net/1912/27718 unknown American Meteorological Society https://doi.org/10.1175/JPO-D-20-0317.1 Spall, M. A. (2021). An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation. Journal of Physical Oceanography, 51(8), 2425–2441. https://hdl.handle.net/1912/27718 doi:10.1175/JPO-D-20-0317.1 Spall, M. A. (2021). An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation. Journal of Physical Oceanography, 51(8), 2425–2441. doi:10.1175/JPO-D-20-0317.1 Eddies Large-scale motions Meridional overturning circulation Ocean dynamics Planetary waves Article 2021 ftwhoas https://doi.org/10.1175/JPO-D-20-0317.1 2022-05-28T23:04:19Z Author Posting. © American Meteorological Society, 2021. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 51(8),(2021): 2425–2441, https://doi.org/10.1175/JPO-D-20-0317.1. The frequency and latitudinal dependence of the midlatitude wind-driven meridional overturning circulation (MOC) is studied using theory and linear and nonlinear applications of a quasigeostrophic numerical model. Wind forcing is varied either by changing the strength of the wind or by shifting the meridional location of the wind stress curl pattern. At forcing periods of less than the first-mode baroclinic Rossby wave basin crossing time scale, the linear response in the middepth and deep ocean is in phase and opposite to the Ekman transport. For forcing periods that are close to the Rossby wave basin crossing time scale, the upper and deep MOC are enhanced, and the middepth MOC becomes phase shifted, relative to the Ekman transport. At longer forcing periods the deep MOC weakens and the middepth MOC increases, but eventually for long enough forcing periods (decadal) the entire wind-driven MOC spins down. Nonlinearities and mesoscale eddies are found to be important in two ways. First, baroclinic instability causes the middepth MOC to weaken, lose correlation with the Ekman transport, and lose correlation with the MOC in the opposite gyre. Second, eddy thickness fluxes extend the MOC beyond the latitudes of direct wind forcing. These results are consistent with several recent studies describing the four-dimensional structure of the MOC in the North Atlantic Ocean. This study was supported by National Science Foundation Grant OCE-1947290. 2022-01-13 Article in Journal/Newspaper North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Journal of Physical Oceanography |
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Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Eddies Large-scale motions Meridional overturning circulation Ocean dynamics Planetary waves |
spellingShingle |
Eddies Large-scale motions Meridional overturning circulation Ocean dynamics Planetary waves Spall, Michael A. An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation |
topic_facet |
Eddies Large-scale motions Meridional overturning circulation Ocean dynamics Planetary waves |
description |
Author Posting. © American Meteorological Society, 2021. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 51(8),(2021): 2425–2441, https://doi.org/10.1175/JPO-D-20-0317.1. The frequency and latitudinal dependence of the midlatitude wind-driven meridional overturning circulation (MOC) is studied using theory and linear and nonlinear applications of a quasigeostrophic numerical model. Wind forcing is varied either by changing the strength of the wind or by shifting the meridional location of the wind stress curl pattern. At forcing periods of less than the first-mode baroclinic Rossby wave basin crossing time scale, the linear response in the middepth and deep ocean is in phase and opposite to the Ekman transport. For forcing periods that are close to the Rossby wave basin crossing time scale, the upper and deep MOC are enhanced, and the middepth MOC becomes phase shifted, relative to the Ekman transport. At longer forcing periods the deep MOC weakens and the middepth MOC increases, but eventually for long enough forcing periods (decadal) the entire wind-driven MOC spins down. Nonlinearities and mesoscale eddies are found to be important in two ways. First, baroclinic instability causes the middepth MOC to weaken, lose correlation with the Ekman transport, and lose correlation with the MOC in the opposite gyre. Second, eddy thickness fluxes extend the MOC beyond the latitudes of direct wind forcing. These results are consistent with several recent studies describing the four-dimensional structure of the MOC in the North Atlantic Ocean. This study was supported by National Science Foundation Grant OCE-1947290. 2022-01-13 |
format |
Article in Journal/Newspaper |
author |
Spall, Michael A. |
author_facet |
Spall, Michael A. |
author_sort |
Spall, Michael A. |
title |
An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation |
title_short |
An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation |
title_full |
An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation |
title_fullStr |
An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation |
title_full_unstemmed |
An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation |
title_sort |
idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation |
publisher |
American Meteorological Society |
publishDate |
2021 |
url |
https://hdl.handle.net/1912/27718 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl |
geographic_facet |
Curl |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Spall, M. A. (2021). An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation. Journal of Physical Oceanography, 51(8), 2425–2441. doi:10.1175/JPO-D-20-0317.1 |
op_relation |
https://doi.org/10.1175/JPO-D-20-0317.1 Spall, M. A. (2021). An idealized modeling study of the midlatitude variability of the wind-driven meridional overturning circulation. Journal of Physical Oceanography, 51(8), 2425–2441. https://hdl.handle.net/1912/27718 doi:10.1175/JPO-D-20-0317.1 |
op_doi |
https://doi.org/10.1175/JPO-D-20-0317.1 |
container_title |
Journal of Physical Oceanography |
_version_ |
1766134507620007936 |