Tracing the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation
Abstract. The flow which constitutes the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation model has been investigated with the help of a particle tracking method. In the region of North Atlantic Deep Water formation a thousand trajectories were calculated backward in ti...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.163.9546 2023-05-15T13:39:13+02:00 Tracing the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation Sybren S. Drijfhout Ernst Maier-reimer Uwe Mikolajewicz The Pennsylvania State University CiteSeerX Archives 1996 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.163.9546 http://www.knmi.nl/publications/fulltexts/jgr96.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.163.9546 http://www.knmi.nl/publications/fulltexts/jgr96.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.knmi.nl/publications/fulltexts/jgr96.pdf text 1996 ftciteseerx 2016-01-07T15:48:30Z Abstract. The flow which constitutes the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation model has been investigated with the help of a particle tracking method. In the region of North Atlantic Deep Water formation a thousand trajectories were calculated backward in time to the point where they upwell from the deep ocean. Both the three-dimensional velocity field and convective overturning have been used for this calculation. Together, the trajectories form a representative picture of the upper branch of the conveyor belt in the model. In the Atlantic Ocean the path and strength (17 Sv) of the conveyor belt in the model are found to be consistent with observations. All trajectories enter the South Atlantic via Drake Passage, as the model does not simulate any Agulhas leakage. Large changes in water masses occur in the South Atlantic midlatitudes and subtropical North Atlantic. Along its path in the Atlantic the water in the conveyor belt is transformed from Antarctic Intermediate Water to Central North Atlantic Water. On the average the timescale on which the water mass characteristics are approximately conserved is only a few years compared to the timescale of 70 years for the conveyor belt to cross the Atlantic. The ventilation of thermocline waters in the South Atlantic midlatitudes is overestimated in the model due to too much convective deepening of the winter mixed layer. As a result the fraction of the conveyor belt water flowing in the surface layer is also overestimated, along with integrated effects of atmospheric forcing. The abnormally strong water mass transformation in the South Atlantic might be related to the absence of Agulhas leakage in the model. Text Antarc* Antarctic Drake Passage North Atlantic Deep Water North Atlantic Unknown Antarctic Drake Passage |
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English |
description |
Abstract. The flow which constitutes the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation model has been investigated with the help of a particle tracking method. In the region of North Atlantic Deep Water formation a thousand trajectories were calculated backward in time to the point where they upwell from the deep ocean. Both the three-dimensional velocity field and convective overturning have been used for this calculation. Together, the trajectories form a representative picture of the upper branch of the conveyor belt in the model. In the Atlantic Ocean the path and strength (17 Sv) of the conveyor belt in the model are found to be consistent with observations. All trajectories enter the South Atlantic via Drake Passage, as the model does not simulate any Agulhas leakage. Large changes in water masses occur in the South Atlantic midlatitudes and subtropical North Atlantic. Along its path in the Atlantic the water in the conveyor belt is transformed from Antarctic Intermediate Water to Central North Atlantic Water. On the average the timescale on which the water mass characteristics are approximately conserved is only a few years compared to the timescale of 70 years for the conveyor belt to cross the Atlantic. The ventilation of thermocline waters in the South Atlantic midlatitudes is overestimated in the model due to too much convective deepening of the winter mixed layer. As a result the fraction of the conveyor belt water flowing in the surface layer is also overestimated, along with integrated effects of atmospheric forcing. The abnormally strong water mass transformation in the South Atlantic might be related to the absence of Agulhas leakage in the model. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Sybren S. Drijfhout Ernst Maier-reimer Uwe Mikolajewicz |
spellingShingle |
Sybren S. Drijfhout Ernst Maier-reimer Uwe Mikolajewicz Tracing the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation |
author_facet |
Sybren S. Drijfhout Ernst Maier-reimer Uwe Mikolajewicz |
author_sort |
Sybren S. Drijfhout |
title |
Tracing the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation |
title_short |
Tracing the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation |
title_full |
Tracing the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation |
title_fullStr |
Tracing the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation |
title_full_unstemmed |
Tracing the conveyor belt in the Hamburg large-scale geostrophic ocean general circulation |
title_sort |
tracing the conveyor belt in the hamburg large-scale geostrophic ocean general circulation |
publishDate |
1996 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.163.9546 http://www.knmi.nl/publications/fulltexts/jgr96.pdf |
geographic |
Antarctic Drake Passage |
geographic_facet |
Antarctic Drake Passage |
genre |
Antarc* Antarctic Drake Passage North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Drake Passage North Atlantic Deep Water North Atlantic |
op_source |
http://www.knmi.nl/publications/fulltexts/jgr96.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.163.9546 http://www.knmi.nl/publications/fulltexts/jgr96.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766116274631344128 |