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Registros recuperados: 9
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A New Coupled Ocean-Waves-Atmosphere Model Designed for Tropical Storm Studies: Example of Tropical Cyclone Bejisa (2013-2014) in the South-West Indian Ocean 5
Pianezze, J.; Barthe, C.; Bielli, S.; Tulet, P.; Jullien, Swen; Cambon, Gildas; Bousquet, O.; Claeys, M.; Cordier, E..
Ocean-Waves-Atmosphere (OWA) exchanges are not well represented in current Numerical Weather Prediction (NWP) systems, which can lead to large uncertainties in tropical cyclone track and intensity forecasts. In order to explore and better understand the impact of OWA interactions on tropical cyclone modelling, a fully coupled OWA system based on the atmospheric model Meso-NH, the oceanic model CROCO and the wave model WW3 and called MSWC was designed and applied to the case of tropical cyclone Bejisa (2013-2014). The fully coupled OWA simulation shows good agreement with the literature and available observations. In particular, simulated significant wave height is within 30 cm of measurements made with buoys and altimeters. Short-term (< 2 days)...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00428/53983/55169.pdf
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Coupled physical/biogeochemical modeling including O-2-dependent processes in the Eastern Boundary Upwelling Systems: application in the Benguela 5
Gutknecht, E.; Dadou, Isabelle; Le Vu, B.; Cambon, Gildas; Sudre, J.; Garcon, V.; Machu, Eric; Rixen, T.; Kock, A.; Flohr, A.; Paulmier, A.; Lavik, G..
The Eastern Boundary Upwelling Systems (EBUS) contribute to one fifth of the global catches in the ocean. Often associated with Oxygen Minimum Zones (OMZs), EBUS represent key regions for the oceanic nitrogen (N) cycle. Important bioavailable N loss due to denitrification and anammox processes as well as greenhouse gas emissions (e. g, N2O) occur also in these EBUS. However, their dynamics are currently crudely represented in global models. In the climate change context, improving our capability to properly represent these areas is crucial due to anticipated changes in the winds, productivity, and oxygen content. We developed a biogeochemical model (BioEBUS) taking into account the main processes linked with EBUS and associated OMZs. We implemented this...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00152/26314/24376.pdf
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Enhanced vertical mixing in coastal upwelling systems driven by diurnal-inertial resonance: numerical experiments 5
Fearon, Giles; Herbette, Steven; Veitch, Jennifer; Cambon, Gildas; Lucas, Andrew J.; Lemarié, Florian; Vichi, Marcello.
The land‐sea breeze is resonant with the inertial response of the ocean at the critical latitude of 30°N/S. 1D‐vertical numerical experiments were undertaken to study the key drivers of enhanced diapycnal mixing in coastal upwelling systems driven by diurnal‐inertial resonance near the critical latitude. The effect of the land boundary was implicitly included in the model through the `Craig approximation' for first order cross‐shore surface elevation gradient response. The model indicates that for shallow water depths (<~100~m), bottom shear stresses must be accounted for in the formulation of the ‘Craig approximation’, as they serve to enhance the cross‐shore surface elevation gradient response, while reducing shear and mixing at the thermocline. The...
Tipo: Text Palavras-chave: Inertial oscillations<; /AUTHOR_KEYWORD>; Land-sea breeze<; /AUTHOR_KEYWORD>; Diurnal-inertial resonance<; /AUTHOR_KEYWORD>; Coastal upwelling<; /AUTHOR_KEYWORD>; Diapycnal mixing<; /AUTHOR_KEYWORD>; Phytoplankton blooms<; /AUTHOR_KEYWORD>.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00643/75507/76384.pdf
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Etude numérique de la mer d'Iroise : dynamique, variabilité du front d'Ouessant et évaluation des échanges cross-frontaux 5
Cambon, Gildas.
This thesis was written in the framework of a realistic modelisation for the study of the Iroise Sea. The first two parts deal with its digital implementation and validation based on observation. We then focus on the analysis of the main structures and physical processes operating in the Iroise Sea: first the Ouessant tidal front and the processes associated with the connexion of surface and bottom mixing layers, then the average eulerian residual circulation for which we tried to quantify the relative part of the different processes involved. We then mapped the different dynamic regimes involved: some cyclostrophic regimes can be observed around the islands and in shallow water areas, and a geostrophic regime clearly appears, at front level, especially in...
Tipo: Text Palavras-chave: Realistic numerical modelling; Cross frontal transports; Tidal front; Tides; Mean general circulation; Iroise Sea; Modélisation numérique réaliste; Transports cross frontaux; Front de marée; Marée; Circulation générale moyenne; Front d'Ouessant; Mer d'Iroise.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6166.pdf
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Lagrangian pathways in the southern Benguela upwelling system 5
Ragoasha, Natalie; Herbette, Steven; Cambon, Gildas; Veitch, Jennifer; Reason, Chris; Roy, Claude.
The effect of ocean currents on fish eggs and larvae during their journey from spawning to nursery grounds in the Southern Benguela upwelling system is poorly understood. The survival and successful transport of fish eggs and larvae results from complex biological and physical processes. This study focuses on the advective processes, more specifically on how the dynamics and characteristics of the ocean currents shape the Lagrangian pathways in the Southern Benguela. A mesoscale eddy resolving interannual (1989–2010) simulation of the region, with a horizontal resolution of 7.5 km, is used to study processes impacting the connectivity between the western edge of the Agulhas Bank and the west coast upwelling region. A set of Lagrangian experiments are...
Tipo: Text Palavras-chave: Benguela; Upwelling; Alongshore connectivity; Lagrangian pathways; Coastal jet; Poleward undercurrent.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59904/63085.pdf
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Nitrogen transfers off Walvis Bay: a 3-D coupled physical/biogeochemical modeling approach in the Namibian upwelling system 5
Gutknecht, E.; Dadou, Isabelle; Marchesiello, P.; Cambon, Gildas; Le Vu, B.; Sudre, J.; Garcon, V.; Machu, Eric; Rixen, T.; Kock, A.; Flohr, A.; Paulmier, A.; Lavik, G..
Eastern boundary upwelling systems (EBUS) are regions of high primary production often associated with oxygen minimum zones (OMZs). They represent key regions for the oceanic nitrogen (N) cycle. By exporting organic matter (OM) and nutrients produced in the coastal region to the open ocean, EBUS can play an important role in sustaining primary production in subtropical gyres. However, losses of fixed inorganic N through denitrification and anammox processes take place in oxygen depleted environments such as EBUS, and can potentially mitigate the role of these regions as a source of N to the open ocean. EBUS can also represent a considerable source of nitrous oxide (N2O) to the atmosphere, affecting the atmospheric budget of N2O. In this paper a 3-D coupled...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00152/26316/24373.pdf
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Observations of the Ushant tidal front in September 2007 5
Le Boyer, A.; Cambon, Gildas; Daniault, N.; Herbette, Steven; Le Cann, B.; Marie, Louis; Morin, P..
The Ushant tidal front is the dominant feature of the summer season hydrological structure of the Iroise Sea. It separates tidally mixed coastal waters from thermally stratified open Celtic Sea waters. This article reports on observations made in September 2007 during two short cruises that took place aboard R/V "Cotes de la Manche", and gives a general account of the physical structure of the front along one cross-frontal transect. The data set comprises data from a 4 month ADCP mooring, short CTD/fluorescence/nutrients transects, Lagrangian drifter trajectories, and HF radar surface current measurements. One finding is that the surface and bottom fronts, being affected by different dynamical influences, are not necessarily coincident in the vertical....
Tipo: Text Palavras-chave: Nutrients; Drifters; HF radars; Hydrology; Tidal mixing front; Shelf dynamics.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6417.pdf
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Twenty-Seven Years of Scatterometer Surface Wind Analysis over Eastern Boundary Upwelling Systems 5
Bentamy, Abderrahim; Grodsky, Semyon A; Cambon, Gildas; Tandeo, Pierre; Capet, Xavier; Roy, Claude; Herbette, Steven; Grouazel, Antoine.
More than twelve satellite scatterometers have operated since 1992 through the present, providing the main source of surface wind vector observations over global oceans. In this study, these scatterometer winds are used in combination with radiometers and synthetic aperture radars (SAR) for the better determination and characterization of high spatial and temporal resolution of regional surface wind parameters, including wind speed and direction, wind stress components, wind stress curl, and divergence. In this paper, a 27-year-long (1992–2018) 6-h satellite wind analysis with a spatial resolution of 0.125° in latitude and longitude is calculated using spatial structure functions derived from high-resolution SAR data. The main objective is to improve...
Tipo: Text Palavras-chave: Satellite scatterometer; Surface wind; Upwelling systems; Long time series.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00682/79416/81989.pdf
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Two Decades [1992-2012] of Surface Wind Analyses based on Satellite Scatterometer Observations 5
Desbiolles, Fabien; Bentamy, Abderrahim; Blanke, Bruno; Roy, Claude; Mestas-nunez, Alberto M.; Grodsky, Semyon A.; Herbette, Steven; Cambon, Gildas; Maes, Christophe.
Surface winds (equivalent neutral wind velocities at 10 m) from scatterometer missions since 1992 have been used to build up a 20-year climate series. Optimal interpolation and kriging methods have been applied to continuously provide surface wind speed and direction estimates over the global ocean on a regular grid in space and time. The use of other data sources such as radiometer data (SSM/I) and atmospheric wind reanalyses (ERA-Interim) has allowed building a blended product available at 1/4° spatial resolution and every 6 hours from 1992 to 2012. Sampling issues throughout the different missions (ERS-1, ERS-2, QuikSCAT, and ASCAT) and their possible impact on the homogeneity of the gridded product are discussed. In addition, we assess carefully the...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00366/47686/47725.pdf
Registros recuperados: 9
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