Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa
Recent current measurements in the tropical eastern North Atlantic reproduce the components of the large scale flow field. However, the observations as well as the 1/12°-FLAME model computations indicate that a lot of eddy scale variability is superimposed on the mean flow field. Despite of the dist...
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ftoceanrep:oai:oceanrep.geomar.de:5767 2023-05-15T13:37:37+02:00 Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa Stramma, Lothar Hüttl, Sabine Schafstall, Jens 2005 text https://oceanrep.geomar.de/id/eprint/5767/ https://oceanrep.geomar.de/id/eprint/5767/1/2005JC002939.pdf https://doi.org/10.1029/2005JC002939 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/5767/1/2005JC002939.pdf Stramma, L. , Hüttl, S. and Schafstall, J. (2005) Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa. Open Access Journal of Geophysical Research: Oceans, 110 . C12006. DOI 10.1029/2005JC002939 <https://doi.org/10.1029/2005JC002939>. doi:10.1029/2005JC002939 info:eu-repo/semantics/openAccess Article PeerReviewed 2005 ftoceanrep https://doi.org/10.1029/2005JC002939 2023-04-07T14:51:33Z Recent current measurements in the tropical eastern North Atlantic reproduce the components of the large scale flow field. However, the observations as well as the 1/12°-FLAME model computations indicate that a lot of eddy scale variability is superimposed on the mean flow field. Despite of the disturbance by variability the signature of the Guinea Dome is well present. In November 2002 the Guinea Dome transport from direct observations was about 2.8 Sv above σ θ = 25.8 kg/m3 and 4 Sv between σ θ = 25.8 and 27.1 kg/m3. The oxygen minimum in the shadow zone comprises the central water and the Antarctic Intermediate Water (AAIW) layers and is located between the equatorial current system and the North Equatorial Current. The North Equatorial Counter- and Undercurrents at 3° to 6°N are major oxygen sources for the central water layer of the low-oxygen regions in the northeastern tropical Atlantic. A second, northern North Equatorial Countercurrent (nNECC) band exists at 8° to 10°N. The nNECC carries oxygen rich water from the southern hemisphere eastward but with an admixture of water from the northern hemisphere. A float at 200 m depth was spreading eastward in the North Equatorial Undercurrent (NEUC), at 28°W it shifted northward into the nNECC, and then was trapped in the Guinea Dome region for more than 3 years. The model indicates the region 22° to 32°W as the area of exchange between the NECC/NEUC and the nNECC bands. In the AAIW layer the northern Intermediate Countercurrent acts as oxygen source for the oxygen minimum zone. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Northeast Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic The Antarctic Journal of Geophysical Research 110 C12 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Recent current measurements in the tropical eastern North Atlantic reproduce the components of the large scale flow field. However, the observations as well as the 1/12°-FLAME model computations indicate that a lot of eddy scale variability is superimposed on the mean flow field. Despite of the disturbance by variability the signature of the Guinea Dome is well present. In November 2002 the Guinea Dome transport from direct observations was about 2.8 Sv above σ θ = 25.8 kg/m3 and 4 Sv between σ θ = 25.8 and 27.1 kg/m3. The oxygen minimum in the shadow zone comprises the central water and the Antarctic Intermediate Water (AAIW) layers and is located between the equatorial current system and the North Equatorial Current. The North Equatorial Counter- and Undercurrents at 3° to 6°N are major oxygen sources for the central water layer of the low-oxygen regions in the northeastern tropical Atlantic. A second, northern North Equatorial Countercurrent (nNECC) band exists at 8° to 10°N. The nNECC carries oxygen rich water from the southern hemisphere eastward but with an admixture of water from the northern hemisphere. A float at 200 m depth was spreading eastward in the North Equatorial Undercurrent (NEUC), at 28°W it shifted northward into the nNECC, and then was trapped in the Guinea Dome region for more than 3 years. The model indicates the region 22° to 32°W as the area of exchange between the NECC/NEUC and the nNECC bands. In the AAIW layer the northern Intermediate Countercurrent acts as oxygen source for the oxygen minimum zone. |
format |
Article in Journal/Newspaper |
author |
Stramma, Lothar Hüttl, Sabine Schafstall, Jens |
spellingShingle |
Stramma, Lothar Hüttl, Sabine Schafstall, Jens Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa |
author_facet |
Stramma, Lothar Hüttl, Sabine Schafstall, Jens |
author_sort |
Stramma, Lothar |
title |
Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa |
title_short |
Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa |
title_full |
Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa |
title_fullStr |
Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa |
title_full_unstemmed |
Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa |
title_sort |
water masses and currents in the upper tropical northeast atlantic off northwest africa |
publisher |
AGU (American Geophysical Union) |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/5767/ https://oceanrep.geomar.de/id/eprint/5767/1/2005JC002939.pdf https://doi.org/10.1029/2005JC002939 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic North Atlantic Northeast Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Northeast Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/5767/1/2005JC002939.pdf Stramma, L. , Hüttl, S. and Schafstall, J. (2005) Water masses and currents in the upper tropical Northeast Atlantic off Northwest Africa. Open Access Journal of Geophysical Research: Oceans, 110 . C12006. DOI 10.1029/2005JC002939 <https://doi.org/10.1029/2005JC002939>. doi:10.1029/2005JC002939 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2005JC002939 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
C12 |
_version_ |
1766095039312691200 |