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Role of bathymetry in Agulhas Current configuration and behaviour - art. no. L23611 ArchiMer
Speich, Sabrina; Lutjeharms, J. R. E.; Penven, P; Blanke, Bruno.
The Agulhas Current forms an important link in the global ocean thermohaline circulation by its role in the interocean exchange of water south of Africa. This process of ring shedding at the current's retroflection is dependent on perturbations to its trajectory that are sensitive to bathymetry. These perturbations may furthermore force the current to intersect shallow regions resulting in substantial changes to its path. A number of other flow characteristics of the system have also been deemed to be influenced by bathymetry. How dependent is Agulhas Current behaviour therefore on the bottom topography? We have used a regional, primitive equation model for initial experimentation. Removing the Agulhas Bank leads to enhanced interocean flux, indicating its...
Tipo: Text Palavras-chave: Inter ocean exchange; Inter ocean flux; Thermohaline circulation; Southwest Africa; Agulhas current.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2308.pdf
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Benefits of radar-derived surface current assimilation for South of Africa ocean circulation ArchiMer
Couvelard, Xavier; Messager, Christophe; Penven, Pierrick; Smet, Sébastien; Lattes, Philippe.
The oceanic circulation south of Africa is characterised by a complex dynamics with a strong variability due to the presence of the Agulhas current and numerous eddies. This area of interest is also the location of several natural gas fields under seafloor which are targeted for drilling and exploitation. The complex and powerful ocean currents induces significant issues for ship operations at the surface as well as under the surface for deep sea operations. Therefore, the knowledge of the state of the currents and the ability to forecast them in a realistic manners could greatly enforce the safety of various marine operation. Following this objective, an array of HF radar systems were deployed to allow a detailed knowledge of the Agulhas currents and its...
Tipo: Text Palavras-chave: 4DVAR; Agulhas current; HF radar; ROMS; Forecast.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00677/78929/81299.pdf
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