Potential vorticity dynamics of the arctic halocline
Author Posting. © American Meteorological Society, 2020. 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 50(9), (2020): 2491-2506, doi:10.1175/JPO-D-20-0056...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/26683 2023-05-15T14:22:48+02:00 Potential vorticity dynamics of the arctic halocline Spall, Michael A. 2020-08-17 https://hdl.handle.net/1912/26683 unknown American Meteorological Society https://doi.org/10.1175/JPO-D-20-0056.1 Spall, M. (2020). Potential vorticity dynamics of the arctic halocline. Journal of Physical Oceanography, 50(9), 2491-2506. https://hdl.handle.net/1912/26683 doi:10.1175/JPO-D-20-0056.1 Spall, M. (2020). Potential vorticity dynamics of the arctic halocline. Journal of Physical Oceanography, 50(9), 2491-2506. doi:10.1175/JPO-D-20-0056.1 Eddies Ekman pumping/transport Ocean circulation Ocean dynamics Potential vorticity Shallow-water equations Article 2020 ftwhoas https://doi.org/10.1175/JPO-D-20-0056.1 2022-05-28T23:03:59Z Author Posting. © American Meteorological Society, 2020. 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 50(9), (2020): 2491-2506, doi:10.1175/JPO-D-20-0056.1. An idealized two-layer shallow water model is applied to the study of the dynamics of the Arctic Ocean halocline. The model is forced by a surface stress distribution reflective of the observed wind stress pattern and ice motion and by an inflow representing the flow of Pacific Water through Bering Strait. The model reproduces the main elements of the halocline circulation: an anticyclonic Beaufort Gyre in the western basin (representing the Canada Basin), a cyclonic circulation in the eastern basin (representing the Eurasian Basin), and a Transpolar Drift between the two gyres directed from the upwind side of the basin to the downwind side of the basin. Analysis of the potential vorticity budget shows a basin-averaged balance primarily between potential vorticity input at the surface and dissipation at the lateral boundaries. However, advection is a leading-order term not only within the anticyclonic and cyclonic gyres but also between the gyres. This means that the eastern and western basins are dynamically connected through the advection of potential vorticity. Both eddy and mean fluxes play a role in connecting the regions of potential vorticity input at the surface with the opposite gyre and with the viscous boundary layers. These conclusions are based on a series of model runs in which forcing, topography, straits, and the Coriolis parameter were varied. This study was supported by National Science Foundation Grant OPP-1822334. Comments and suggestions from two anonymous referees greatly helped to improve the paper. 2021-02-17 Article in Journal/Newspaper Arctic Arctic Arctic Ocean Bering Strait canada basin Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Arctic Ocean Bering Strait Canada Pacific Western Basin Journal of Physical Oceanography 50 9 2491 2506 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Eddies Ekman pumping/transport Ocean circulation Ocean dynamics Potential vorticity Shallow-water equations |
spellingShingle |
Eddies Ekman pumping/transport Ocean circulation Ocean dynamics Potential vorticity Shallow-water equations Spall, Michael A. Potential vorticity dynamics of the arctic halocline |
topic_facet |
Eddies Ekman pumping/transport Ocean circulation Ocean dynamics Potential vorticity Shallow-water equations |
description |
Author Posting. © American Meteorological Society, 2020. 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 50(9), (2020): 2491-2506, doi:10.1175/JPO-D-20-0056.1. An idealized two-layer shallow water model is applied to the study of the dynamics of the Arctic Ocean halocline. The model is forced by a surface stress distribution reflective of the observed wind stress pattern and ice motion and by an inflow representing the flow of Pacific Water through Bering Strait. The model reproduces the main elements of the halocline circulation: an anticyclonic Beaufort Gyre in the western basin (representing the Canada Basin), a cyclonic circulation in the eastern basin (representing the Eurasian Basin), and a Transpolar Drift between the two gyres directed from the upwind side of the basin to the downwind side of the basin. Analysis of the potential vorticity budget shows a basin-averaged balance primarily between potential vorticity input at the surface and dissipation at the lateral boundaries. However, advection is a leading-order term not only within the anticyclonic and cyclonic gyres but also between the gyres. This means that the eastern and western basins are dynamically connected through the advection of potential vorticity. Both eddy and mean fluxes play a role in connecting the regions of potential vorticity input at the surface with the opposite gyre and with the viscous boundary layers. These conclusions are based on a series of model runs in which forcing, topography, straits, and the Coriolis parameter were varied. This study was supported by National Science Foundation Grant OPP-1822334. Comments and suggestions from two anonymous referees greatly helped to improve the paper. 2021-02-17 |
format |
Article in Journal/Newspaper |
author |
Spall, Michael A. |
author_facet |
Spall, Michael A. |
author_sort |
Spall, Michael A. |
title |
Potential vorticity dynamics of the arctic halocline |
title_short |
Potential vorticity dynamics of the arctic halocline |
title_full |
Potential vorticity dynamics of the arctic halocline |
title_fullStr |
Potential vorticity dynamics of the arctic halocline |
title_full_unstemmed |
Potential vorticity dynamics of the arctic halocline |
title_sort |
potential vorticity dynamics of the arctic halocline |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://hdl.handle.net/1912/26683 |
geographic |
Arctic Arctic Ocean Bering Strait Canada Pacific Western Basin |
geographic_facet |
Arctic Arctic Ocean Bering Strait Canada Pacific Western Basin |
genre |
Arctic Arctic Arctic Ocean Bering Strait canada basin |
genre_facet |
Arctic Arctic Arctic Ocean Bering Strait canada basin |
op_source |
Spall, M. (2020). Potential vorticity dynamics of the arctic halocline. Journal of Physical Oceanography, 50(9), 2491-2506. doi:10.1175/JPO-D-20-0056.1 |
op_relation |
https://doi.org/10.1175/JPO-D-20-0056.1 Spall, M. (2020). Potential vorticity dynamics of the arctic halocline. Journal of Physical Oceanography, 50(9), 2491-2506. https://hdl.handle.net/1912/26683 doi:10.1175/JPO-D-20-0056.1 |
op_doi |
https://doi.org/10.1175/JPO-D-20-0056.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
50 |
container_issue |
9 |
container_start_page |
2491 |
op_container_end_page |
2506 |
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1766295325734076416 |