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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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| Speer, Kevin G; Tziperman, Eli; Feliks, Yizhak. |
| A reduced-gravity model for a dense bottom layer under a motionless deep layer is used to investigate bottom layer flow with topography. The two competing effects in the model are topography, which introduces a topographic beta effect, and strong layer thickness variation, which allows for the possibility of zero-layer thickness or grounding. The goal is to arrive at a simple, observationally relevant characterization of the model which can help to distinguish different dynamical mechanisms operating in the ocean. Several regimes are identified, including situations for which the layer depth goes to zero with and without topography. Ways of distinguishing observationally between competing effects are suggested. The study is motivated by the observed shift... |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00193/30390/29227.pdf |
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