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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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| Fornerino, M.; Molines, Jean-marc; Le Provost, Christian. |
| Ce rapport présente la synthêse des travaux effectués à l'Institut de Mécanique de Grenoble dans le cadre du contrat C.N. E.X.O. 80/6260 dont l'objet principal était l'amélioration du modèle numérique de circulation des marées dans la Manche développé antérieurenent dans notre Laboratoire. Pour ce faire, il était proposé d'établir une procédure permettant de prendre en compte un nombre élevé de composantes de marées pour la définition des conditions aux limites. Une amélioration sensible de la représentativité de la réponse du modèle en comparaison avec ce que l'on connaît de la nature en était attendue, en particulier en ce qui concerne les composantes non linéaires d'ordre supérieur (sixième diurnes) et les courants de dérives. Le travail réalisé... |
| Tipo: Text |
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| Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/00105/21641/19222.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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| Treguier, Anne-marie; Deshayes, Julie; Lique, Camille; Dussin, Raphael; Molines, Jean-marc. |
| The meridional transport of salt in the Atlantic ocean is an important process for climate, controlling the stability of the meridional overturning circulation. The contribution of transient eddies to this transport is quantified in an eddy resolving North Atlantic model at 1/12 degrees resolution (NATL12), and compared with lower resolution North-Atlantic and global 1/4 degrees models. In NATL12 between 10 degrees N and 40 degrees N, there is a volume loss by evaporation of 0.6 Sverdrups (Sv). The divergence of the eddy flux of salt (normalized by a reference salinity of 34.8) is 0.2 Sv over the region, a significant fraction of the total air-seawater exchange, but it is compensated by an opposite convergent transport of salt by the mean flow, so that the... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00083/19441/17052.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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| 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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| Assassi, Charefeddine; Vandermeirsch, Frederic; Morel, Yves; Charria, Guillaume; Theetten, Sebastien; Dussin, Raphael; Molines, Jean-marc. |
| The aim of this study is to better understand the different overriding mechanisms that control the evolution of the temperature in the Bay of Biscay, through realistic simulations over a period of 50 years. Based on the work of Michel et al. (2009) on the variability of temperature in the Bay of Biscay (Fig1). We will extend the understanding of the interannual variability to the haline contents and the circulation at regional scale. Here we compare two global simulations, ORCA-G70 and ORCA-GRD100 (¼°resolution), that differs mainly in the vertical resolution and we show their variability. |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00197/30778/29137.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... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00192/30319/28790.pdf |
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