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Registros recuperados: 4
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Modelling cyclonic eddies in the Delagoa Bight region ArchiMer
Cossa, O.; Pous, Stephane; Penven, P.; Capet, X; Reason, C. J. C..
The objective of this study is to document and shed light on the circulation around the Delagoa Bight region in the southern Mozambique Channel using a realistic modelling approach. A simulation including mesoscale forcings at the boundaries of our regional configuration succeeds in reproducing the general circulation in the region as well as the existence of a semi-permanent cyclonic eddy, whose existence is attested by in situ measurements in the Bight. Characterised by a persistent local minimum in SSH located around 26 °S—34 °E, this cyclonic eddy termed herein the Delagoa Bight lee eddy occurs about 25% of the time with no clear seasonal preference. Poleward moving cyclones, mostly generated further north, occur another 25% of the time in the Bight...
Tipo: Text Palavras-chave: Delagoa Bight; Cyclonic lee eddy; Coastal countercurrent; Numerical model; Mozambique Channel; Shelf processes.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00318/42941/42449.pdf
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SIDDIES Corridor: A Major East-West Pathway of Long-Lived Surface and Subsurface Eddies Crossing the Subtropical South Indian Ocean ArchiMer
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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Suppressing and enhancing effects of mesoscale dynamics on biological production in the Mozambique Channel ArchiMer
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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Uncovering a New Current: The Southwest MAdagascar Coastal Current ArchiMer
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
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00428/53984/55159.pdf
Registros recuperados: 4
Primeira ... 1 ... Última
 

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