The thermally-driven ocean circulation with realistic bathymetry
The global circulation driven solely by relaxation to an idealized surface temperature profile and to interior mixing is examined. Forcing by winds and evaporation/precipitation is excluded. The resulting circulation resembles the observed in many ways, and the overturning is of similar magnitude. T...
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ftoslouniv:oai:www.duo.uio.no:10852/62169 2023-05-15T13:46:09+02:00 The thermally-driven ocean circulation with realistic bathymetry Gjermundsen, Ada Lacasce, Joseph Henry Denstad, Liv 2018-02-12T11:17:26Z http://hdl.handle.net/10852/62169 http://urn.nb.no/URN:NBN:no-64748 https://doi.org/10.1175/JPO-D-17-0147.1 EN eng American Meteorological Society NOTUR/NORSTORE/NN9358K http://urn.nb.no/URN:NBN:no-64748 Gjermundsen, Ada Lacasce, Joseph Henry Denstad, Liv . The thermally-driven ocean circulation with realistic bathymetry. Journal of Physical Oceanography. 2018 http://hdl.handle.net/10852/62169 1564285 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Physical Oceanography&rft.volume=&rft.spage=&rft.date=2018 Journal of Physical Oceanography http://dx.doi.org/10.1175/JPO-D-17-0147.1 URN:NBN:no-64748 Fulltext https://www.duo.uio.no/bitstream/handle/10852/62169/4/jpo-d-17-0147.1%281%29.pdf 0022-3670 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2018 ftoslouniv https://doi.org/10.1175/JPO-D-17-0147.1 2020-06-21T08:51:46Z The global circulation driven solely by relaxation to an idealized surface temperature profile and to interior mixing is examined. Forcing by winds and evaporation/precipitation is excluded. The resulting circulation resembles the observed in many ways, and the overturning is of similar magnitude. The overturning is driven by large-scale upwelling in the interior (which is relatively large, because of the use of a constant mixing coefficient). The compensating downwelling occurs in the northern North Atlantic and in the Ross and Weddell Seas, with an additional, smaller contribution from the northern North Pacific. The latter is weaker because the Bering Strait limits the northward extent of the flow. The downwelling occurs in frictional layers near the boundaries and depends on the lateral shear in the horizontal flow. The shear, in turn, is linked to the imposed surface temperature gradient via thermal wind, and as such, the downwelling can be reduced or eliminated in selected regions by removing the surface gradient. Doing so in the northern North Atlantic causes the (thermally driven) Antarctic Circumpolar Current to intensify, increasing the sinking along Antarctica. Eliminating the surface gradient in the Southern Ocean increases the sinking in the North Atlantic and Pacific. As there is upwelling also in the western boundary currents, the flow must increase even more to accomplish the necessary downwelling. The implications of the results are then considered, particularly with respect to Arctic intensification of global warming, which will reduce the surface temperature gradient. This research was originally published in the Journal of Physical Oceanography. © 2018 American Meteorological Society Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic Bering Strait Global warming North Atlantic Southern Ocean Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Antarctic Arctic Bering Strait Pacific Southern Ocean Weddell Journal of Physical Oceanography 48 3 647 665 |
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Open Polar |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
The global circulation driven solely by relaxation to an idealized surface temperature profile and to interior mixing is examined. Forcing by winds and evaporation/precipitation is excluded. The resulting circulation resembles the observed in many ways, and the overturning is of similar magnitude. The overturning is driven by large-scale upwelling in the interior (which is relatively large, because of the use of a constant mixing coefficient). The compensating downwelling occurs in the northern North Atlantic and in the Ross and Weddell Seas, with an additional, smaller contribution from the northern North Pacific. The latter is weaker because the Bering Strait limits the northward extent of the flow. The downwelling occurs in frictional layers near the boundaries and depends on the lateral shear in the horizontal flow. The shear, in turn, is linked to the imposed surface temperature gradient via thermal wind, and as such, the downwelling can be reduced or eliminated in selected regions by removing the surface gradient. Doing so in the northern North Atlantic causes the (thermally driven) Antarctic Circumpolar Current to intensify, increasing the sinking along Antarctica. Eliminating the surface gradient in the Southern Ocean increases the sinking in the North Atlantic and Pacific. As there is upwelling also in the western boundary currents, the flow must increase even more to accomplish the necessary downwelling. The implications of the results are then considered, particularly with respect to Arctic intensification of global warming, which will reduce the surface temperature gradient. This research was originally published in the Journal of Physical Oceanography. © 2018 American Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Gjermundsen, Ada Lacasce, Joseph Henry Denstad, Liv |
spellingShingle |
Gjermundsen, Ada Lacasce, Joseph Henry Denstad, Liv The thermally-driven ocean circulation with realistic bathymetry |
author_facet |
Gjermundsen, Ada Lacasce, Joseph Henry Denstad, Liv |
author_sort |
Gjermundsen, Ada |
title |
The thermally-driven ocean circulation with realistic bathymetry |
title_short |
The thermally-driven ocean circulation with realistic bathymetry |
title_full |
The thermally-driven ocean circulation with realistic bathymetry |
title_fullStr |
The thermally-driven ocean circulation with realistic bathymetry |
title_full_unstemmed |
The thermally-driven ocean circulation with realistic bathymetry |
title_sort |
thermally-driven ocean circulation with realistic bathymetry |
publisher |
American Meteorological Society |
publishDate |
2018 |
url |
http://hdl.handle.net/10852/62169 http://urn.nb.no/URN:NBN:no-64748 https://doi.org/10.1175/JPO-D-17-0147.1 |
geographic |
Antarctic Arctic Bering Strait Pacific Southern Ocean Weddell |
geographic_facet |
Antarctic Arctic Bering Strait Pacific Southern Ocean Weddell |
genre |
Antarc* Antarctic Antarctica Arctic Bering Strait Global warming North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Arctic Bering Strait Global warming North Atlantic Southern Ocean |
op_source |
0022-3670 |
op_relation |
NOTUR/NORSTORE/NN9358K http://urn.nb.no/URN:NBN:no-64748 Gjermundsen, Ada Lacasce, Joseph Henry Denstad, Liv . The thermally-driven ocean circulation with realistic bathymetry. Journal of Physical Oceanography. 2018 http://hdl.handle.net/10852/62169 1564285 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Physical Oceanography&rft.volume=&rft.spage=&rft.date=2018 Journal of Physical Oceanography http://dx.doi.org/10.1175/JPO-D-17-0147.1 URN:NBN:no-64748 Fulltext https://www.duo.uio.no/bitstream/handle/10852/62169/4/jpo-d-17-0147.1%281%29.pdf |
op_doi |
https://doi.org/10.1175/JPO-D-17-0147.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
48 |
container_issue |
3 |
container_start_page |
647 |
op_container_end_page |
665 |
_version_ |
1766237812374372352 |