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| Lankhorst, Matthias; Fratantoni, David; Ollitrault, Michel; Richardson, Philip; Send, Uwe; Zenk, Walter. |
| A comprehensive analysis of velocity data from subsurface floats in the northwestern tropical Atlantic at two depth layers is presented: one representing the Antarctic Intermediate Water (AAIW, pressure range 600-1050dbar), the other the upper North Atlantic Deep Water (uNADW, pressure range 1200-2050dbar). New data from three independent research programs are combined with previously available data to achieve blanket coverage in space for the AAIW layer, while coverage in the uNADW remains more intermittent. Results from the AAIW` mainly confirm previous studies on the mean flow, namely the equatorial zonal and the boundary currents, but clarify details on pathways, mostly by virtue of the spatial data coverage that sets float observations apart from e.g.... |
| Tipo: Text |
Palavras-chave: Equatorial currents; North Atlantic Deep Water; Antarctic Intermediate Water; Tropical Atlantic; Floats. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6815.pdf |
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| Ollitrault, Michel; Lankhorst, Matthias; Fratantoni, David; Richardson, Philip; Zenk, Walter. |
| Acoustic float data collected near 800 m depth, are used to map zonal mean currents within the Antarctic Intermediate Water (AAIW) tongue in the equatorial Atlantic. Alternating zonal jets of 2° latitudinal width are revealed between 6°S and 6°N. Displacements from profiling floats drifting near 1000 m depth, also reveal similar zonal jets at the base of the AAIW layer. The strongest jets (15 cm s−1 peak) are found at 4°S, 2°S, 0°, 2°N and 4°N. They are coherent longitudinally over order of 3000 km and, poleward of 1°S and 1°N, generally coherent vertically between 800 m and 1000 m. Large seasonal fluctuations exist at both levels: within 1° of equator, AAIW at 800 m flows westward (8 cm s−1 mean) in boreal summer and fall but eastward... |
| Tipo: Text |
Palavras-chave: Seasonal fluctuations; Float data; Zonal current; Antarctic intermediate Water; Equatorial Atlantic ocean. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1112.pdf |
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| Speer, Kevin G; Zenk, Walter. |
| The total transport of Antarctic Bottom Water across the Rio Grande Rise, including the western boundary, the Vema Channel, and the Hunter Channel is estimated from hydrographic measurements across these pathways. The contribution of the Vema Channel is greatest at 3.9 X 10(6) m(3) s(-1), which is very close to earlier estimates. The western boundary current contribution is 2.0 X 10(6) m(3) s(-1) and that of the Hunter Channel 0.7 X 10(6) m(3) s(-1). The lower values outside the Vema Channel are offset by the important source of mass they form to the lower density classes of bottom water. About 40% of the now is concentrated in the highest density class representing the source of Weddell Sea Deep Water to the Brazil Basin. The flow structure is... |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00192/30354/29112.pdf |
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