Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model
An inverse box model of the Scotia Sea is constructed using hydrographic, tracer, and velocity data collected along the rim of the basin during the Antarctic Large-Scale Box Analysis and the Role of the Scotia Sea (ALBATROSS) cruise. The model provides an estimate of the time-mean three-dimensional...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2003
|
Subjects: | |
Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/15926/ https://ueaeprints.uea.ac.uk/id/eprint/15926/1/DS_32.pdf https://doi.org/10.1175/1520-0485(2003)033<2565:WMCFAM>2.0.CO;2 |
id |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:15926 |
---|---|
record_format |
openpolar |
spelling |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:15926 2023-06-06T11:46:18+02:00 Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model Naveira Garabato, Alberto C. Stevens, David P. Heywood, Karen J. 2003 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/15926/ https://ueaeprints.uea.ac.uk/id/eprint/15926/1/DS_32.pdf https://doi.org/10.1175/1520-0485(2003)033<2565:WMCFAM>2.0.CO;2 en eng https://ueaeprints.uea.ac.uk/id/eprint/15926/1/DS_32.pdf Naveira Garabato, Alberto C., Stevens, David P. and Heywood, Karen J. (2003) Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model. Journal of Physical Oceanography, 33 (12). pp. 2565-2587. ISSN 0022-3670 doi:10.1175/1520-0485(2003)033<2565:WMCFAM>2.0.CO;2 Article PeerReviewed 2003 ftuniveastangl https://doi.org/10.1175/1520-0485(2003)033<2565:WMCFAM>2.0.CO;2 2023-04-13T22:31:21Z An inverse box model of the Scotia Sea is constructed using hydrographic, tracer, and velocity data collected along the rim of the basin during the Antarctic Large-Scale Box Analysis and the Role of the Scotia Sea (ALBATROSS) cruise. The model provides an estimate of the time-mean three-dimensional circulation as the Antarctic Circumpolar Current (ACC) crosses the region. It concurrently solves for geostrophic and wind-driven Ekman transports across the boundaries of the basin, air–sea-driven diapycnal fluxes, and “interior” diapycnal fluxes below the ocean surface. An increase is diagnosed in the ACC volume transport from 143 ± 13 Sv (Sv = 106 m3 s-1) at Drake Passage to 149 ± 16 Sv on leaving the Scotia Sea, supplied by the import of 5.9 ± 1.7 Sv of Weddell Sea Deep Water (WSDW) over the South Scotia Ridge. There is a lateral redistribution of the transport, primarily in response to a topographically induced branching of the 70–80 Sv polar front (PF) jet and an increase in the transport associated with the subantarctic front (SAF) from 31 ± 7 to 48 ± 4 Sv. A vertical rearrangement of the transport also occurs, with differences O(2 Sv) in the transports of intermediate and deep water masses. These volume transport changes are accompanied by a net reduction (increase) in the heat (freshwater) flux associated with the ACC by 0.02 ± 0.020 PW (0.020 ± 0.017 Sv), the main cause of which is the cooling and freshening of the Circumpolar Deep Water (CDW) layer in the Scotia Sea. The model suggests that the Scotia Sea hosts intense diapycnal mixing in the ocean interior extending 1500–2000 m above the rough topography of the basin. Despite these model results, no evidence is found for a significant diapycnal link between the upper and lower classes of CDW (and hence between the “shallow” and “deep” cells of the Southern Ocean meridional overturning circulation). On the contrary, the boundary between Upper and Lower CDW separates two distinct regimes of diapycnal mixing involving volume fluxes of 1–3 Sv. Whereas in the ... Article in Journal/Newspaper Antarc* Antarctic Drake Passage Scotia Sea Southern Ocean Weddell Sea University of East Anglia: UEA Digital Repository Antarctic Southern Ocean The Antarctic Weddell Sea Drake Passage Scotia Sea Weddell South Scotia Ridge ENVELOPE(-46.500,-46.500,-60.000,-60.000) |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
An inverse box model of the Scotia Sea is constructed using hydrographic, tracer, and velocity data collected along the rim of the basin during the Antarctic Large-Scale Box Analysis and the Role of the Scotia Sea (ALBATROSS) cruise. The model provides an estimate of the time-mean three-dimensional circulation as the Antarctic Circumpolar Current (ACC) crosses the region. It concurrently solves for geostrophic and wind-driven Ekman transports across the boundaries of the basin, air–sea-driven diapycnal fluxes, and “interior” diapycnal fluxes below the ocean surface. An increase is diagnosed in the ACC volume transport from 143 ± 13 Sv (Sv = 106 m3 s-1) at Drake Passage to 149 ± 16 Sv on leaving the Scotia Sea, supplied by the import of 5.9 ± 1.7 Sv of Weddell Sea Deep Water (WSDW) over the South Scotia Ridge. There is a lateral redistribution of the transport, primarily in response to a topographically induced branching of the 70–80 Sv polar front (PF) jet and an increase in the transport associated with the subantarctic front (SAF) from 31 ± 7 to 48 ± 4 Sv. A vertical rearrangement of the transport also occurs, with differences O(2 Sv) in the transports of intermediate and deep water masses. These volume transport changes are accompanied by a net reduction (increase) in the heat (freshwater) flux associated with the ACC by 0.02 ± 0.020 PW (0.020 ± 0.017 Sv), the main cause of which is the cooling and freshening of the Circumpolar Deep Water (CDW) layer in the Scotia Sea. The model suggests that the Scotia Sea hosts intense diapycnal mixing in the ocean interior extending 1500–2000 m above the rough topography of the basin. Despite these model results, no evidence is found for a significant diapycnal link between the upper and lower classes of CDW (and hence between the “shallow” and “deep” cells of the Southern Ocean meridional overturning circulation). On the contrary, the boundary between Upper and Lower CDW separates two distinct regimes of diapycnal mixing involving volume fluxes of 1–3 Sv. Whereas in the ... |
format |
Article in Journal/Newspaper |
author |
Naveira Garabato, Alberto C. Stevens, David P. Heywood, Karen J. |
spellingShingle |
Naveira Garabato, Alberto C. Stevens, David P. Heywood, Karen J. Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model |
author_facet |
Naveira Garabato, Alberto C. Stevens, David P. Heywood, Karen J. |
author_sort |
Naveira Garabato, Alberto C. |
title |
Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model |
title_short |
Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model |
title_full |
Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model |
title_fullStr |
Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model |
title_full_unstemmed |
Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model |
title_sort |
water mass conversion, fluxes, and mixing in the scotia sea diagnosed by an inverse model |
publishDate |
2003 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/15926/ https://ueaeprints.uea.ac.uk/id/eprint/15926/1/DS_32.pdf https://doi.org/10.1175/1520-0485(2003)033<2565:WMCFAM>2.0.CO;2 |
long_lat |
ENVELOPE(-46.500,-46.500,-60.000,-60.000) |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Sea Drake Passage Scotia Sea Weddell South Scotia Ridge |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Sea Drake Passage Scotia Sea Weddell South Scotia Ridge |
genre |
Antarc* Antarctic Drake Passage Scotia Sea Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Drake Passage Scotia Sea Southern Ocean Weddell Sea |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/15926/1/DS_32.pdf Naveira Garabato, Alberto C., Stevens, David P. and Heywood, Karen J. (2003) Water mass conversion, fluxes, and mixing in the Scotia Sea diagnosed by an inverse model. Journal of Physical Oceanography, 33 (12). pp. 2565-2587. ISSN 0022-3670 doi:10.1175/1520-0485(2003)033<2565:WMCFAM>2.0.CO;2 |
op_doi |
https://doi.org/10.1175/1520-0485(2003)033<2565:WMCFAM>2.0.CO;2 |
_version_ |
1767951557145395200 |