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Registros recuperados: 4
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Control and Stabilization of the Gulf Stream by Oceanic Current Interaction with the Atmosphere ArchiMer
Renault, Lionel; Molemaker, Maarten Jeroen; Gula, Jonathan; Masson, Sebastien; Mcwilliams, James C..
The Gulf Stream (GS) is known to have a strong influence on climate, for example, by transporting heat from the tropics to higher latitudes. Although the GS transport intensity presents a clear interannual variability, satellite observations reveal its mean path is stable. Numerical models can simulate some characteristics of the mean GS path, but persistent biases keep the GS separation and postseparation unstable and therefore unrealistic. This study investigates how the integration of ocean surface currents into the ocean–atmosphere coupling interface of numerical models impacts the GS. The authors show for the first time that the current feedback, through its eddy killing effect, stabilizes the GS separation and postseparation, resolving long-lasting...
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00358/46879/46760.pdf
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Dampening of Submesoscale Currents by Air-Sea Stress Coupling in the Californian Upwelling System ArchiMer
Renault, Lionel; Mcwilliams, James C.; Gula, Jonathan.
Oceanic submesoscale currents (SMCs) occur on an scale of 0.1-10 km horizontally and have a large influence on the oceanic variability and on ecosystems. At the mesoscale (10-250 km), oceanic thermal and current feedbacks are known to have a significant influence on the atmosphere and on oceanic dynamics. However, air-sea interactions at the submesoscale are not well known because the small size of SMCs presents observational and simulation barriers. Using high-resolution coupled oceanic and atmospheric models for the Central California region during the upwelling season, we show that the current feedback acting through the surface stress dominates the thermal feedback effect on the ocean and dampens the SMC variability by approximate to 17% +/- 4%. As for...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00456/56804/58672.pdf
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Effects of upwelling duration and phytoplankton growth regime on dissolved oxygen levels in an idealized Iberian Peninsula upwelling system ArchiMer
Bettencourt, João H.; Rossi, Vincent; Renault, Lionel; Haynes, Peter; Morel, Yves; Garçon, Véronique.
We apply a coupled modelling system composed of a state-of-the-art hydrodynamical model and a low complexity biogeochemical model to an idealized Iberian Peninsula upwelling system to identify the main drivers of dissolved oxygen variability and to study its response to changes in the duration of the upwelling season and in phytoplankton growth regime. We find that the export of oxygenated waters by upwelling front turbulence is a major sink for nearshore dissolved oxygen. In our simulations of summer upwelling, when phytoplankton population is generally dominated by diatoms whose growth is largely enhanced by nutrient input, net primary production and air-sea exchange compensate dissolved oxygen depletion by offshore export over the shelf. A shorter...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00516/62747/67135.pdf
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Modulation of the Agulhas Current Retroflection and Leakage by Oceanic Current Interaction with the Atmosphere in Coupled Simulations ArchiMer
Renault, Lionel; Mcwilliams, James C.; Penven, Pierrick.
Coupled ocean-atmosphere simulations are carried out for the Mozambique Channel, the Agulhas Current System, and the Benguela Upwelling System to assess the ocean surface current feedback to the atmosphere and its impact on the Agulhas Current (AC) retroflection and leakage. Consistent with previous studies, we show that the current feedback slows down the oceanic mean circulation and acts as an oceanic eddy killer by modulating the energy transfer between the atmosphere and the ocean, reducing by 25% the mesoscale energy and inducing a pathway of energy transfer from the ocean to the atmosphere. The current feedback, by dampening the Eddy Kinetic Energy (EKE), shifts westward the distribution of the AC retroflection location, reducing the presence of...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00389/50077/50670.pdf
Registros recuperados: 4
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