Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre
We study the impacts of a continental slope on instability and mesoscale eddy fluxes in idealized 3-layer numerical model simulations. The simulations are inspired by and mimic the situation in the Arctic Ocean's Beaufort Gyre, where anti-cyclonic winds drive anti-cyclonic currents that are gui...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2024
|
Subjects: | |
Online Access: | http://hdl.handle.net/10852/111985 https://doi.org/10.1029/2023JC020757 |
id |
ftoslouniv:oai:www.duo.uio.no:10852/111985 |
---|---|
record_format |
openpolar |
spelling |
ftoslouniv:oai:www.duo.uio.no:10852/111985 2024-09-09T19:26:16+00:00 Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre ENEngelskEnglishInstability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre Isachsen, Pål Erik Vogt-Vincent, Noam S. Johnson, Helen L. Nilsson, Johan 2024-07-30T12:06:46Z http://hdl.handle.net/10852/111985 https://doi.org/10.1029/2023JC020757 EN eng NFR/314826 Isachsen, Pål Erik Vogt-Vincent, Noam S. Johnson, Helen L. Nilsson, Johan . Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre. Journal of Geophysical Research (JGR): Oceans. 2024, 129 http://hdl.handle.net/10852/111985 2283683 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Geophysical Research (JGR): Oceans&rft.volume=129&rft.spage=&rft.date=2024 Journal of Geophysical Research (JGR): Oceans 129 8 https://doi.org/10.1029/2023JC020757 Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ 2169-9275 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2024 ftoslouniv https://doi.org/10.1029/2023JC020757 2024-08-19T14:07:39Z We study the impacts of a continental slope on instability and mesoscale eddy fluxes in idealized 3-layer numerical model simulations. The simulations are inspired by and mimic the situation in the Arctic Ocean's Beaufort Gyre, where anti-cyclonic winds drive anti-cyclonic currents that are guided by the continental slope. The forcing and currents are retrograde with respect to topographic Rossby waves. The focus of the analysis is on eddy potential vorticity (PV) fluxes and eddy-mean flow interactions under the Transformed Eulerian Mean framework. Eddy lateral vorticity fluxes dominate over the continental slope where eddy form stress, that is, vertical momentum flux, is suppressed due to the topographic PV gradient. The diagnosis also shows that while eddy momentum fluxes are up-gradient over parts of the slope, the total quasi-geostrophic PV flux is down-gradient everywhere. We then calculate the linearly unstable modes of the time-mean state and find that the most unstable mode contains several key features of the observed finite-amplitude fluxes over the slope, including down-gradient PV fluxes. When accounting for additional unstable modes, more qualitative features of the observed eddy fluxes in the numerical model are reproduced. Article in Journal/Newspaper Arctic Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Journal of Geophysical Research: Oceans 129 8 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
We study the impacts of a continental slope on instability and mesoscale eddy fluxes in idealized 3-layer numerical model simulations. The simulations are inspired by and mimic the situation in the Arctic Ocean's Beaufort Gyre, where anti-cyclonic winds drive anti-cyclonic currents that are guided by the continental slope. The forcing and currents are retrograde with respect to topographic Rossby waves. The focus of the analysis is on eddy potential vorticity (PV) fluxes and eddy-mean flow interactions under the Transformed Eulerian Mean framework. Eddy lateral vorticity fluxes dominate over the continental slope where eddy form stress, that is, vertical momentum flux, is suppressed due to the topographic PV gradient. The diagnosis also shows that while eddy momentum fluxes are up-gradient over parts of the slope, the total quasi-geostrophic PV flux is down-gradient everywhere. We then calculate the linearly unstable modes of the time-mean state and find that the most unstable mode contains several key features of the observed finite-amplitude fluxes over the slope, including down-gradient PV fluxes. When accounting for additional unstable modes, more qualitative features of the observed eddy fluxes in the numerical model are reproduced. |
format |
Article in Journal/Newspaper |
author |
Isachsen, Pål Erik Vogt-Vincent, Noam S. Johnson, Helen L. Nilsson, Johan |
spellingShingle |
Isachsen, Pål Erik Vogt-Vincent, Noam S. Johnson, Helen L. Nilsson, Johan Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre |
author_facet |
Isachsen, Pål Erik Vogt-Vincent, Noam S. Johnson, Helen L. Nilsson, Johan |
author_sort |
Isachsen, Pål Erik |
title |
Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre |
title_short |
Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre |
title_full |
Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre |
title_fullStr |
Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre |
title_full_unstemmed |
Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre |
title_sort |
instability and mesoscale eddy fluxes in an idealized 3-layer beaufort gyre |
publishDate |
2024 |
url |
http://hdl.handle.net/10852/111985 https://doi.org/10.1029/2023JC020757 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
2169-9275 |
op_relation |
NFR/314826 Isachsen, Pål Erik Vogt-Vincent, Noam S. Johnson, Helen L. Nilsson, Johan . Instability and mesoscale eddy fluxes in an idealized 3-layer Beaufort Gyre. Journal of Geophysical Research (JGR): Oceans. 2024, 129 http://hdl.handle.net/10852/111985 2283683 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Geophysical Research (JGR): Oceans&rft.volume=129&rft.spage=&rft.date=2024 Journal of Geophysical Research (JGR): Oceans 129 8 https://doi.org/10.1029/2023JC020757 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1029/2023JC020757 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
129 |
container_issue |
8 |
_version_ |
1809895929198673920 |