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| Registros recuperados: 10 | |
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| Penduff, Thierry; Serazin, Guillaume; Leroux, Stephanie; Close, Sally; Molines, Jean-marc; Barnier, Bernard; Bessieres, Laurent; Terray, Laurent; Maze, Guillaume. |
| Global ocean models that admit mesoscale turbulence spontaneously generate a substantial interannual-to-multidecadal chaotic intrinsic variability in the absence of atmospheric forcing variability at these timescales. is phenomenon is substantially weaker in non-turbulent ocean models but provides a marked stochastic avor to the low-frequency variability in eddying ocean models, which are being cou- pled to the atmosphere for next-generation climate projections. In order to disentangle the atmospherically forced and intrinsic ocean variabilities, the OCCIPUT (OceaniC Chaos – ImPacts, strUcture, predicTability) project performed a long (1960–2015), large ensemble (50 members) of global ocean/sea ice 1/4° simulations driven by the same atmospheric... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00448/55959/57440.pdf |
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| Lique, Camille; Garric, Gilles; Treguier, Anne-marie; Barnier, Bernard; Ferry, Nicolas; Testut, Charles-emmanuel; Ardhuin, Fanny. |
| The authors investigate the variability of salinity in the Arctic Ocean and in the Nordic and Labrador Seas over recent years to see how the freshwater balance in the Arctic and the exchanges with the North Atlantic have been affected by the recent important sea ice melting, especially during the 2007 sea ice extent minimum. The Global Ocean Reanalysis and Simulations (GLORYS1) global ocean reanalysis based on a global coupled ocean sea ice model with an average of 12-km grid resolution in the Arctic Ocean is used in this regard. Although no sea ice data and no data under sea ice are assimilated, simulation over the 2001-09 period is shown to represent fairly well the 2007 sea ice event and the different components accounting for the ocean and sea ice... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00035/14637/11946.pdf |
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| Le Sommer, Julien; Penduff, Thierry; Theetten, Sebastien; Madec, Gurvan; Barnier, Bernard. |
| Recent studies have shown that the use of an enstrophy-and-energy-conserving momentum advection scheme substantially reduces widespread biases of mean currents in the global 1/4 degrees DRAKKAR model. This paper investigates the origin of these improvements. A series of sensitivity simulations with different momentum advection schemes is performed with the North Atlantic 1/4 degrees DRAKKAR model. Three second order momentum advection schemes conserving, respectively, enstrophy (ens), energy (efx) and both quantities (een) are tested and their impact on the model solution are compared. The mean kinetic energy vertical profile is found to change up to 10% depending on the chosen scheme. This sensitivity is maximum in bottom layers. The analysis of the... |
| Tipo: Text |
Palavras-chave: Z level models; Topography; Momentum advection schemes. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6440.pdf |
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| Treguier, Anne-marie; Gourcuff, Claire; Lherminier, Pascale; Mercier, Herle; Barnier, Bernard; Madec, Gurvan; Molines, Jean-marc; Penduff, Thierry; Czeschel, Lars; Boning, Claus. |
| Numerical models are used to estimate the meridional overturning and transports along the paths of two hydrographic cruises, carried out in 1997 and 2002 from Greenland to Portugal. We have examined the influence of the different paths of the two cruises and found that it could explain 0.4 to 2 Sv of difference in overturning (the precise value is model-dependent). Models show a decrease in the overturning circulation between 1997 and 2002, with different amplitudes. The CLIPPER ATL6 model reproduces well the observed weakening of the overturning in density coordinates between the cruises; in the model, the change is due to the combination of interannual and high-frequency forcing and internal variability associated with eddies and meanders. Examination of... |
| Tipo: Text |
Palavras-chave: Ocean model; Thermohaline circulation; North Atlantic; Climate variability; Oceanography. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2199.pdf |
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| Molines, Jean-marc; Treguier, Anne-marie; Barnier, Bernard; Brodeau, Laurent; Le Sommer, Julien; Madec, Gurvan; Penduff, Thierry; Theetten, Sebastien; Drillet, Yann; Talandier, Claude; Orr, James; Lachkar, Zouair. |
| Tipo: Text |
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| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/00027/13871/11023.pdf |
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| Treguier, Anne-marie; Deshayes, Julie; Le Sommer, Julien; Lique, Camille; Madec, G.; Penduff, Thierry; Molines, Jean-marc; Barnier, Bernard; Bourdalle-badie, Romain; Talandier, Claude. |
| The meridional transport of salt is computed in a global eddy-resolving numerical model (1/12 degrees resolution) in order to improve our understanding of the ocean salinity budget. A methodology is proposed that allows a global analysis of the salinity balance in relation to surface water fluxes, without defining a "freshwater anomaly" based on an arbitrary reference salinity. The method consists of a decomposition of the meridional transport into (i) the transport by the time-longitude-depth mean velocity, (ii) time-mean velocity recirculations and (iii) transient eddy perturbations. Water is added (rainfall and rivers) or removed (evaporation) at the ocean surface at different latitudes, which creates convergences and divergences of mass transport with... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00192/30319/28790.pdf |
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| Barnier, Bernard; Lazure, Pascal. |
| L'océanographie physique côtière a pour objet d'observer, de comprendre et de prévoir le fonctionnement hydrodynamique du milieu côtier, avec comme enjeux, dans le cadre d'applications pluridisciplinaires, la pollution côtière, la gestion et la préservation des écosystèmes et des ressources halieutiques, la contribution des zones côtières aux puits de carbone, l'hydrodynamique sédimentaire et les échanges eau - sédiments. Contrairement à l'océanographie du large, l'océanographie côtière n'a pas bénéficié de grands programmes internationaux (tel que le World Ocean Circulation Experiment -WOCE) pour structurer ses activités de recherche dans le domaine de l'observation et de la modélisation au niveau national ou international. De plus, les problèmes traités... |
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| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00020/13162/10212.pdf |
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| Hirschi, Joel J. M.; Barnier, Bernard; Boning, Claus; Biastoch, Arne; Blaker, Adam T.; Coward, Andrew; Danilov, Sergey; Drijfhout, Sybren; Getzlaff, Klaus; Griffies, Steven M.; Hasumi, Hiroyasu; Hewitt, Helene; Iovino, Doroteaciro; Kawasaki, Takao; Kiss, Andrew E.; Koldunov, Nikolay; Marzocchi, Alice; Mecking, Jennifer, V; Moat, Ben; Molines, Jean-marc; Myers, Paul G.; Penduff, Thierry; Roberts, Malcolm; Treguier, Anne-marie; Sein, Dmitry, V; Sidorenko, Dimitry; Small, Justin; Spence, Paul; Thompson, Luanne; Weijer, Wilbert; Xu, Xiaobiao. |
| The Atlantic meridional overturning circulation (AMOC) represents the zonally integrated stream function of meridional volume transport in the Atlantic Basin. The AMOC plays an important role in transporting heat meridionally in the climate system. Observations suggest a heat transport by the AMOC of 1.3 PW at 26 degrees N-a latitude which is close to where the Atlantic northward heat transport is thought to reach its maximum. This shapes the climate of the North Atlantic region as we know it today. In recent years there has been significant progress both in our ability to observe the AMOC in nature and to simulate it in numerical models. Most previous modeling investigations of the AMOC and its impact on climate have relied on models with horizontal... |
| Tipo: Text |
Palavras-chave: Atlantic Meridional Overturning; High-resolution modeling; Mesoscale. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00657/76865/78146.pdf |
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| Registros recuperados: 10 | |
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