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| Ramanantsoa, Juliano D.; Penven, P.; Krug, M.; Gula, J.; Rouault, M.. |
| Cruise data sets, satellite remote sensing observations, and model data analyses are combined to highlight the existence of a coastal surface poleward flow in the southwest of Madagascar: the Southwest MAdagascar Coastal Current (SMACC). The SMACC is a relatively shallow (<300 m) and narrow (<100 km wide) warm and salty coastal surface current, which flows along the south western coast of Madagascar toward the south, opposite to the dominant winds. The warm water surface signature of the SMACC extends from 22°S (upstream) to 26.4°S (downstream). The SMACC exhibits a seasonal variability: more intense in summer and reduced in winter. The average volume transport of its core is about 1.3 Sv with a mean summer maximum of 2.1 Sv. It is forced by a strong... |
| Tipo: Text |
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| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00428/53984/55159.pdf |
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| Dilmahamod, Ahmad Fehmi; Aguiar-gonzalez, B.; Penven, P.; Reason, C. J. C.; De Ruijter, W. P. M.; Malan, N.; Hermes, J. C.. |
| South Indian Ocean eddies (SIDDIES), originating from a high evaporation region in the eastern Indian Ocean, are investigated by tracking individual eddies from satellite data and co‐located Argo floats. A subsurface‐eddy identification method, based on its steric dynamic height anomaly, is devised to assign Argo profiles to surface eddies (surfSIDDIES) or subsurface eddies (subSIDDIES). These westward‐propagating, long‐lived features (>3 months) prevail over a preferential latitudinal band, forming a permanent structure linking the eastern to the western Indian Ocean, that we call the 'SIDDIES Corridor'. Key features have been revealed in the mean thermohaline vertical structure of these eddies. Anticyclonic SIDDIES are characterized by positive... |
| Tipo: Text |
Palavras-chave: South Indian Ocean; Eddy corridor; Surface and subsurface eddies; Long-lived eddies; Eddy demography; Heat; Freshwater fluxes. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00440/55194/56670.pdf |
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| Jose, Y. S.; Penven, P.; Aumont, O.; Machu, E.; Moloney, C. L.; Shillington, F.; Maury, O.. |
| We used a coupled physical-biogeochemical model to investigate how the strong eddy activity typical of the Mozambique Channel affects biological production. A numerical experiment was carried out, in which mesoscale dynamics were suppressed by cancelling the nonlinear terms for horizontal momentum in the Naviers-Stokes equation. Mesoscale dynamics were found to be responsible for (1) increased offshore production in the Mozambique Channel as a result of net eddy-induced offshore transport of nutrient-rich coastal waters; (2) decreased shelf production along the central Mozambican and south-west Madagascar coast caused by a reduction in nutrient availability related to the net eddy-induced lateral transport of nutrients; (3) increased coastal production... |
| Tipo: Text |
Palavras-chave: Mesoscale dynamics; Chlorophyll; Primary production; Mozambique Channel. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00317/42860/42286.pdf |
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