Seasonal variability of deep currents in the equatorial Atlantic: A model study.
A suite of high-resolution models of the Atlantic Ocean circulation is used to study the deep seasonal current variability in the equatorial regime, with a particular emphasis on its manifestation in the variability of the interhemispheric transports near the western boundary. The basic experiment h...
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ftoceanrep:oai:oceanrep.geomar.de:7012 2023-05-15T17:13:55+02:00 Seasonal variability of deep currents in the equatorial Atlantic: A model study. Böning, Claus W. Kröger, Jürgen 2005-01 text https://oceanrep.geomar.de/id/eprint/7012/ https://oceanrep.geomar.de/id/eprint/7012/1/1-s2.0-S0967063704001700-main.pdf https://doi.org/10.1016/j.dsr.2004.06.015 en eng Elsevier https://oceanrep.geomar.de/id/eprint/7012/1/1-s2.0-S0967063704001700-main.pdf Böning, C. W. and Kröger, J. (2005) Seasonal variability of deep currents in the equatorial Atlantic: A model study. Deep Sea Research Part I: Oceanographic Research Papers, 52 (1). pp. 99-121. DOI 10.1016/j.dsr.2004.06.015 <https://doi.org/10.1016/j.dsr.2004.06.015>. doi:10.1016/j.dsr.2004.06.015 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2005 ftoceanrep https://doi.org/10.1016/j.dsr.2004.06.015 2023-04-07T14:53:57Z A suite of high-resolution models of the Atlantic Ocean circulation is used to study the deep seasonal current variability in the equatorial regime, with a particular emphasis on its manifestation in the variability of the interhemispheric transports near the western boundary. The basic experiment has a resolution of 1/3∘1/3∘ horizontally and 45 vertical levels, and is subject to a monthly mean atmospheric forcing based on ECMWF flux fields. Sensitivity experiments explore the effects of higher horizontal resolution (1/12∘1/12∘), and alternative mixing parameterizations. The model behavior near the equator confirms previous suggestions based on solutions of the WOCE Community Modelling Effort (“CME”) and the “DYNAMO” model intercomparison project, of the presence of a system of vigorous seasonal current oscillations, spanning the whole water column and nearly the whole zonal extent of the basin. The patterns of the primarily zonal current anomalies are fairly robust across the range of model cases investigated, i.e., show relatively little sensitivity to horizontal resolution/mixing, or to the different choices of vertical discretization and vertical mixing as in the DYNAMO cases. The amplitude of the seasonal variation exceeds 10 cm/s in the surface layer, and decreases to about 5 cm/s near 1000 m and 2–3 cm/s in the deep ocean in both the basic 1/3∘1/3∘- and the 1/12∘1/12∘-cases, thereby leading to seasonally reversing current signatures at all depths below the EUC. A particular aspect of the seasonal current variability concerns its manifestation in the southward transport of North Atlantic Deep Water (NADW) by the Deep Western Boundary Current (DWBC). The temporal characteristics of the DWBC variability are in agreement with moored current meter observations at 44∘W44∘W, with simulated DWBC transports varying between a maximum of more than 30 Sv in January/February, and almost vanishing transport in September. However, in contrast to the annual-mean deep water transport which is confined to the DWBC and ... Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Deep Sea Research Part I: Oceanographic Research Papers 52 1 99 121 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
A suite of high-resolution models of the Atlantic Ocean circulation is used to study the deep seasonal current variability in the equatorial regime, with a particular emphasis on its manifestation in the variability of the interhemispheric transports near the western boundary. The basic experiment has a resolution of 1/3∘1/3∘ horizontally and 45 vertical levels, and is subject to a monthly mean atmospheric forcing based on ECMWF flux fields. Sensitivity experiments explore the effects of higher horizontal resolution (1/12∘1/12∘), and alternative mixing parameterizations. The model behavior near the equator confirms previous suggestions based on solutions of the WOCE Community Modelling Effort (“CME”) and the “DYNAMO” model intercomparison project, of the presence of a system of vigorous seasonal current oscillations, spanning the whole water column and nearly the whole zonal extent of the basin. The patterns of the primarily zonal current anomalies are fairly robust across the range of model cases investigated, i.e., show relatively little sensitivity to horizontal resolution/mixing, or to the different choices of vertical discretization and vertical mixing as in the DYNAMO cases. The amplitude of the seasonal variation exceeds 10 cm/s in the surface layer, and decreases to about 5 cm/s near 1000 m and 2–3 cm/s in the deep ocean in both the basic 1/3∘1/3∘- and the 1/12∘1/12∘-cases, thereby leading to seasonally reversing current signatures at all depths below the EUC. A particular aspect of the seasonal current variability concerns its manifestation in the southward transport of North Atlantic Deep Water (NADW) by the Deep Western Boundary Current (DWBC). The temporal characteristics of the DWBC variability are in agreement with moored current meter observations at 44∘W44∘W, with simulated DWBC transports varying between a maximum of more than 30 Sv in January/February, and almost vanishing transport in September. However, in contrast to the annual-mean deep water transport which is confined to the DWBC and ... |
format |
Article in Journal/Newspaper |
author |
Böning, Claus W. Kröger, Jürgen |
spellingShingle |
Böning, Claus W. Kröger, Jürgen Seasonal variability of deep currents in the equatorial Atlantic: A model study. |
author_facet |
Böning, Claus W. Kröger, Jürgen |
author_sort |
Böning, Claus W. |
title |
Seasonal variability of deep currents in the equatorial Atlantic: A model study. |
title_short |
Seasonal variability of deep currents in the equatorial Atlantic: A model study. |
title_full |
Seasonal variability of deep currents in the equatorial Atlantic: A model study. |
title_fullStr |
Seasonal variability of deep currents in the equatorial Atlantic: A model study. |
title_full_unstemmed |
Seasonal variability of deep currents in the equatorial Atlantic: A model study. |
title_sort |
seasonal variability of deep currents in the equatorial atlantic: a model study. |
publisher |
Elsevier |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/7012/ https://oceanrep.geomar.de/id/eprint/7012/1/1-s2.0-S0967063704001700-main.pdf https://doi.org/10.1016/j.dsr.2004.06.015 |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/7012/1/1-s2.0-S0967063704001700-main.pdf Böning, C. W. and Kröger, J. (2005) Seasonal variability of deep currents in the equatorial Atlantic: A model study. Deep Sea Research Part I: Oceanographic Research Papers, 52 (1). pp. 99-121. DOI 10.1016/j.dsr.2004.06.015 <https://doi.org/10.1016/j.dsr.2004.06.015>. doi:10.1016/j.dsr.2004.06.015 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2004.06.015 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
52 |
container_issue |
1 |
container_start_page |
99 |
op_container_end_page |
121 |
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