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Influence of mesoscale eddies on biological production in the Mozambique Channel: Several contrasted examples from a coupled ocean-biogeochemistry model ArchiMer
Jose, Yonss; Aumont, Olivier; Machu, Eric; Penven, Pierrick; Moloney, C. L.; Maury, Olivier.
The impact of mesoscale activity on phytoplankton and nutrient distribution in the Mozambique Channel was simulated by coupling a biogeochemical model (PISCES) with a regional oceanic model (ROMS). Examples of the effects of eddies on the biogeochemistry of the Mozambique Channel are presented to illustrate the complexity of the system. In the model, several cyclonic eddies were found with low concentrations of chlorophyll at their cores, which contrasts with previous studies in the open ocean. In addition, several anticyclonic eddies were simulated with high concentrations of chlorophyll at their cores. Phytoplankton growth within these mesoscale features (both cyclonic and anticyclonic eddies) occurred in response to nutrient injection into the euphotic...
Tipo: Text Palavras-chave: Ocean physical-biogeochemical coupling; Cyclonic and anticyclonic eddies; Chlorophyll; Nutrients; Mozambique Channel.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00162/27320/25549.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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