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| Registros recuperados: 12 | |
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| Lebel, Thierry; Parker, Douglas J.; Flamant, Cyrille; Hoeller, Hartmut; Polcher, Jan; Redelsperger, Jean-luc; Thorncroft, Chris; Bock, Olivier; Bourles, Bernard; Galle, Sylvie; Marticorena, Beatrice; Mougin, Eric; Peugeot, Christophe; Cappelaere, Bernard; Descroix, Luc; Diedhiou, Arona; Gaye, Amadou; Lafore, Jean-philippe. |
| The AMMA (African Monsoon Multidiscplinary Analysis) field programme aimed at documenting the West African Monsoon (WAM) climate system, in all its geophysical components. It also includes an important socio-economic component. Encompassing a wide range of spatial and time scales, AMMA is one of the most ambitious such programmes ever set up. While the key accomplishments of AMMA are summarised in this paper, a few lessons of broad interest are also drawn both as a tribute to the extraordinary efforts made by a community of several hundreds of people and as possible guidelines for ensuring a long lasting future to integrated climate and environmental studies in West Africa. |
| Tipo: Text |
Palavras-chave: Field campaigns; Instrument deployment; Long-term monitoring; Capacity building; West Africa. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00214/32510/30990.pdf |
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| Lemarié, Florian; Samson, Guillaume; Redelsperger, Jean-luc; Giordani, Hervé; Brivoal, Théo; Madec, Gurvan. |
| A simplified model of the atmospheric boundary layer (ABL) of intermediate complexity between a bulk parameterization and a three-dimensional atmospheric model is developed and integrated to the Nucleus for European Modelling of the Ocean (NEMO) general circulation model. An objective in the derivation of such a simplified model, called ABL1d, is to reach an apt representation in ocean-only numerical simulations of some of the key processes associated with air–sea interactions at the characteristic scales of the oceanic mesoscale. In this paper we describe the formulation of the ABL1d model and the strategy to constrain this model with large-scale atmospheric data available from reanalysis or real-time forecasts. A particular emphasis is on the appropriate... |
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| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00679/79085/81536.pdf |
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| Pineau-guillou, Lucia; Ardhuin, Fabrice; Bouin, Marie-noelle; Redelsperger, Jean-luc; Chapron, Bertrand; Bidlot, Jean-raymond; Quilfen, Yves. |
| Strong winds may be biased in atmospheric models. Here the ECMWF coupled wave-atmosphere model is used (1) to evaluate strong winds against observations, (2) to test how alternative wind stress parameterizations could lead to a more accurate model. For the period of storms Kaat and Lilli (23 to 27 January 2014), we compared simulated winds with in-situ – moored buoys and platforms - and satellite observations available from the North Atlantic. Five wind stress parameterizations were evaluated. The first result is that moderate simulated winds (5-20 m s-1) match with all observations. However, for strong winds (above 20 m s-1), mean differences appear, as much as -7 m s-1 at 30 m s-1. Significant differences also exist between observations, with buoys and... |
| Tipo: Text |
Palavras-chave: Air-sea exchanges; Northeast Atlantic; Winds; IFS; Sea state; Roughness length; Drag coefficient; Wind stress. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00410/52118/52826.pdf |
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| Lac, Christine; Chaboureau, Jean-pierre; Masson, Valery; Pinty, Jean-pierre; Tulet, Pierre; Escobar, Juan; Leriche, Maud; Barthe, Christelle; Aouizerats, Benjamin; Augros, Clotilde; Aumond, Pierre; Auguste, Franck; Bechtold, Peter; Berthet, Sarah; Bielli, Soline; Bosseur, Frederic; Caumont, Olivier; Cohard, Jean-martial; Colin, Jeanne; Couvreux, Fleur; Cuxart, Joan; Delautier, Gaelle; Dauhut, Thibaut; Ducrocq, Veronique; Filippi, Jean-baptiste; Gazen, Didier; Geoffroy, Olivier; Gheusi, Francois; Honnert, Rachel; Lafore, Jean-philippe; Brossier, Cindy Lebeaupin; Libois, Quentin; Lunet, Thibaut; Mari, Celine; Maric, Tomislav; Mascart, Patrick; Moge, Maxime; Molinie, Gilles; Nuissier, Olivier; Pantillon, Florian; Peyrille, Philippe; Pergaud, Julien; Perraud, Emilie; Pianezze, Joris; Redelsperger, Jean-luc; Ricard, Didier; Richard, Evelyne; Riette, Sebastien; Rodier, Quentin; Schoetter, Robert; Seyfried, Leo; Stein, Joel; Suhre, Karsten; Taufour, Marie; Thouron, Odile; Turner, Sandra; Verrelle, Antoine; Vie, Benoit; Visentin, Florian; Vionnet, Vincent; Wautelet, Philippe. |
| This paper presents the Meso-NH model version 5.4. Meso-NH is an atmospheric non hydrostatic research model that is applied to a broad range of resolutions, from synoptic to turbulent scales, and is designed for studies of physics and chemistry. It is a limited-area model employing advanced numerical techniques, including monotonic advection schemes for scalar transport and fourth-order centered or odd-order WENO advection schemes for momentum. The model includes state-of-the-art physics parameter-ization schemes that are important to represent convectivescale phenomena and turbulent eddies, as well as flows at larger scales. In addition, Meso-NH has been expanded to provide capabilities for a range of Earth system prediction applications such as chemistry... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00444/55549/57137.pdf |
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| Ayet, Alex; Redelsperger, Jean-luc. |
| We present an analytical model reproducing literature‐based numerical simulations of the Marine Atmospheric Boundary Layer (MABL) over a SST front, with wind blowing from the cold to the warm side. Turbulence is parameterised through a varying diffusion coefficient with two critical features: it is parabolic on the vertical and its mean value is decoupled from the MABL height (unlike an Ekman layer model). These two novel features are found essential to recover the internal structure of the MABL from numerical simulations. Different dynamical regimes are obtained and interpreted in terms of non‐dimensional numbers characterising the relative importance of terms driving the momentum equation. A closed‐form expression of the vertically integrated wind... |
| Tipo: Text |
Palavras-chave: Air-sea interaction; Analytical model; Boundary-layer flow; SST front. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00501/61230/64808.pdf |
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| Parsons, D. B.; Beland, M.; Burridge, D.; Bougeault, P.; Brunet, G.; Caughey, J.; Cavallo, S. M.; Charron, M.; Davies, H. C.; Niang, A. Diongue; Ducrocq, V.; Gauthier, P.; Hamill, T. M.; Harr, P. A.; Jones, S. C.; Langland, R. H.; Majumdar, S. J.; Mills, B. N.; Moncrieff, M.; Nakazawa, T.; Paccccagnella, T.; Rabier, F.; Redelsperger, Jean-luc; Riedel, C.; Saunders, R. W.; Shapiro, M. A.; Swinbank, R.; Szunyogh, I.; Thorncroft, C.; Thorpe, A. J.; Wang, X.; Waliser, D.; Wernli, H.; Toth, Z.. |
| The Observing System Research and Predictability Experiment (THORPEX) was a 10-yr, international research program organized by the World Meteorological Organization’s World Weather Research Program. THORPEX was motivated by the need to accelerate the rate of improvement in the accuracy of 1-day to 2-week forecasts of high-impact weather for the benefit of society, the economy, and the environment. THORPEX, which took place from 2005 to 2014, was the first major international program focusing on the advancement of global numerical weather prediction systems since the Global Atmospheric Research Program, which took place almost 40 years earlier, from 1967 through 1982. The scientific achievements of THORPEX were accomplished through bringing together... |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00663/77534/79363.pdf |
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| Couvelard, Xavier; Lemarié, Florian; Samson, Guillaume; Redelsperger, Jean-luc; Ardhuin, Fabrice; Benshila, Rachid; Madec, Gurvan. |
| This paper describes the implementation of a coupling between a three-dimensional ocean general circulation model (NEMO) and a wave model (WW3) to represent the interactions of the upper oceanic flow dynamics with surface waves. The focus is on the impact of such coupling on upper-ocean properties (temperature and currents) and mixed-layer depths (MLD) at global eddying scales. A generic coupling interface has been developed and the NEMO governing equations and boundary conditions have been adapted to include wave-induced terms following the approach of McWilliams et al. (2004) and Ardhuin et al. (2008). In particular, the contributions of Stokes-Coriolis, Vortex and surface pressure forces have been implemented on top of the necessary modifications of the... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00512/62338/66599.pdf |
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| Voldoire, Aurore; Decharme, Bertrand; Pianezze, Joris; Brossier, Cindy Lebeaupin; Sevault, Florence; Seyfried, Leo; Garnier, Valerie; Bielli, Soline; Valcke, Sophie; Alias, Antoinette; Accensi, Mickael; Ardhuin, Fabrice; Bouin, Marie-noelle; Ducrocq, Veronique; Faroux, Stephanie; Giordani, Herve; Leger, Fabien; Marsaleix, Patrick; Rainaud, Romain; Redelsperger, Jean-luc; Richard, Evelyne; Riette, Sebastien. |
| This study presents the principles of the new coupling interface based on the SURFEX multi-surface model and the OASIS3-MCT coupler. As SURFEX can be plugged into several atmospheric models, it can be used in a wide range of applications, from global and regional coupled climate systems to high-resolution numerical weather prediction systems or very fine-scale models dedicated to process studies. The objective of this development is to build and share a common structure for the atmosphere-surface coupling of all these applications, involving on the one hand atmospheric models and on the other hand ocean, ice, hydrology, and wave models. The numerical and physical principles of SURFEX interface between the different component models are described, and the... |
| Tipo: Text |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00412/52391/53239.pdf |
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| Registros recuperados: 12 | |
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