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| Bouruet-aubertot, Pascale; Cuypers, Yannis; Ferron, Bruno; Dausse, Denis; Menage, Olivier; Atmadipoera, Agus; Jaya, Indra. |
| Microstructure measurements were performed along two sections through the Halmahera Sea and the Ombai Strait and at a station in the deep Banda Sea. Contrasting dissipation rates (𝜖) and vertical eddy diffusivities (K z ) were obtained with depth-averaged ranges of ∼[9×10−10−10−5] W kg− 1 and of ∼[1×10−5−2×10−3] m2 s− 1, respectively. Similarly, turbulence intensity, I=ϵ/(νN2) with ν the kinematic viscosity and N the buoyancy frequency, was found to vary seven orders of magnitude with values up to 107. These large ranges of variations were correlated with the internal tide energy level, which highlights the contrast between regions close and far from internal tide generations. Finescale parameterizations of 𝜖 induced by the breaking of... |
| Tipo: Text |
Palavras-chave: Turbulence; Internal tides; Vertical mixing; Parameterization; Indonesian seas; Microstructure measurements. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00441/55240/56792.pdf |
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| Waldman, Robin; Somot, Samuel; Herrmann, Marine; Testor, Pierre; Estournel, Claude; Sevault, Florence; Prieur, Louis; Mortier, Laurent; Coppola, Laurent; Taillandier, Vincent; Conan, Pascal; Dausse, Denis. |
| The Northwestern Mediterranean (NWMed) Sea includes one of the best observed ocean deep convection sites in the World. An observing system simulation experiment (OSSE) is developed to provide a methodology for estimating observing network errors. It is applied to quantify dense water volumes in the NWMed during 2012–2013 with their observation error from MOOSE network. Results from the OSSE show low spatiotemporal sampling errors, which confirms MOOSE network ability to measure dense waters. However, results are highly sensitive to instrumental stability. The dense water volume is then estimated in observations from four ship cruises between summers 2012 and 2013. A large seasonal cycle is found, maximal in spring 2013 and dominated by the area west of... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00350/46080/46025.pdf |
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| Testor, Pierre; Bosse, Anthony; Houpert, Loic; Margirier, Felix; Mortier, Laurent; Legoff, Herve; Dausse, Denis; Labaste, Matthieu; Karstensen, Johannes; Hayes, Daniel; Olita, Antonio; Ribotti, Alberto; Schroeder, Katrin; Chiggiato, Jacopo; Onken, Reiner; Heslop, Emma; Mourre, Baptiste; D'Ortenzio, Fabrizio; Mayot, Nicolas; Lavigne, Heloise; De Fommervault, Orens; Coppola, Laurent; Prieur, Louis; Taillandier, Vincent; De Madron, Xavier Durrieu; Bourrin, Francois; Many, Gael; Damien, Pierre; Estournel, Claude; Marsaleix, Patrick; Taupier-letage, Isabelle; Raimbault, Patrick; Waldman, Robin; Bouin, Marie-noelle; Giordani, Herve; Caniaux, Guy; Somot, Samuel; Ducrocq, Veronique; Conan, Pascal. |
| During winter 2012-2013, open-ocean deep convection which is a major driver for the thermohaline circulation and ventilation of the ocean, occurred in the Gulf of Lions (Northwestern Mediterranean Sea) and has been thoroughly documented thanks in particular to the deployment of several gliders, Argo profiling floats, several dedicated ship cruises, and a mooring array during a period of about a year. Thanks to these intense observational efforts, we show that deep convection reached the bottom in winter early in February 2013 in a area of maximum 28±3 109m9. We present new quantitative results with estimates of heat and salt content at the sub-basin scale at different time scales (on the seasonal scale to a ten days basis) through optimal interpolation... |
| Tipo: Text |
Palavras-chave: Ocean observation; Oceanic deep convection; Mediterranean Sea; Energy and buoyancy fluxes; Eddies; Plumes; Symmetric instability. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00415/52639/53494.pdf |
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| Capet, Xavier; Estrade, Philippe; Machu, Eric; Ndoye, Siny; Grelet, Jacques; Lazar, Alban; Marie, Louis; Dausse, Denis; Brehmer, Patrice. |
| Upwelling off southern Senegal and Gambia takes place over a wide shelf with a large area where depths are shallower than 20 m. This results in typical upwelling patterns that are distinct (e.g., more persistent in time and aligned alongshore) from those of other better known systems, including Oregon and Peru where inner shelves are comparatively narrow. Synoptic to superinertial variability of this upwelling center is captured through a 4-week intensive field campaign, representing the most comprehensive measurements of this region to date. The influence of mesoscale activity extends across the shelf break and far over the shelf where it impacts the midshelf upwelling (e.g., strength of the upwelling front and circulation), possibly in concert with wind... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00374/48541/48842.pdf |
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