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Modeling the Wake of the Marquesas Archipelago ArchiMer
Raapoto, H.; Martinez, E.; Petrenko, A.; Doglioli, A. M.; Maes, C..
In this study, a high-resolution (∼2.5 km) numerical model was set up to investigate the fine-scale activity within the region of the Marquesas archipelago. This has never been performed before. The robustness of the model results is assessed by comparison with remote sensing and in situ observations. Our results highlight regions of warm waters leeward of the different islands with high eddy kinetic energy (EKE) on their sides. The analysis of energy conversion terms reveals contributions to EKE variability by wind, baroclinic, and barotropic instabilities. The use of a geometry-based eddy detection algorithm reveals the generation of cyclonic and anticyclonic eddies in the wake of the largest islands, with both an inshore and offshore effect. Maximum...
Tipo: Text Palavras-chave: Marquesas archipelago; Island wakes; Fine-scale processes; Eddy kinetic energy; Eddy detection; Island mass effect.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00428/53986/55146.pdf
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A surface “super-convergence” pathway connecting the South Indian Ocean to the subtropical South Pacific gyre ArchiMer
Maes, C.; Grima, N.; Blanke, Bruno; Martinez, E.; Paviet-salomon, T.; Huck, Thierry.
We study the dispersion and convergence of marine floating material by surface currents from a model reanalysis that represents explicitly mesoscale eddy variability. Lagrangian experiments about the long-term evolution (29 years) of an initially homogeneous concentration of particles are performed at global scale with horizontal current at ¼° resolution and refreshed daily over the 1985-2013 period. Results confirm and document the five known sites of surface convergence at the scale of individual oceanic basins, but also reveal a convergent pathway connecting the South Indian subtropical region with the convergence zone of the South Pacific through the Great Australian Bight, the Tasman Sea and the southwest Pacific Ocean. This “super-convergent” pathway...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00425/53631/54461.pdf
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