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| Gasparin, Florent; Greiner, Eric; Lellouche, Jean-michel; Legalloudec, Olivier; Garric, Gilles; Drillet, Yann; Bourdalle-badie, Romain; Le Traon, Pierre-yves; Remy, Elisabeth; Drevillon, Marie. |
| The global high resolution monitoring and forecasting system PSY4 at Mercator Océan, initialized in October 2006, has achieved 11 years of global ocean state estimation. Based on the NEMO global 1/12° configuration, PSY4 includes data assimilation of satellite and multi-instrument in situ observations. In parallel to this monitoring system, a twin-free simulation (with no assimilation) has been performed for the period 2007-2015. In this study, monthly-averaged fields of both ocean state estimates are compared with observation products for the period 2007-2015, to examine the consistency of PSY4 fields with related observations for representing large-scale variability and to provide a baseline that is mainly focused on in situ comparisons for... |
| Tipo: Text |
Palavras-chave: Global ocean monitoring and forecasting system; Climate variability; System evaluation/qualification; Global ocean observing system. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00448/55956/57550.pdf |
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| Lellouche, Jean-michel; Greiner, Eric; Le Galloudec, Olivier; Garric, Gilles; Regnier, Charly; Drevillon, Marie; Benkiran, Mounir; Testut, Charles-emmanuel; Bourdalle-badie, Romain; Gasparin, Florent; Hernandez, Olga; Levier, Bruno; Drilled, Yann; Remy, Elisabeth; Le Traon, Pierre-yves. |
| Since 19 October 2016, and in the framework of Copernicus Marine Environment Monitoring Service (CMEMS), Mercator Ocean has delivered real-time daily services (weekly analyses and daily 10-day forecasts) with a new global 1∕12° high-resolution (eddy-resolving) monitoring and forecasting system. The model component is the NEMO platform driven at the surface by the IFS ECMWF atmospheric analyses and forecasts. Observations are assimilated by means of a reduced-order Kalman filter with a three-dimensional multivariate modal decomposition of the background error. Along-track altimeter data, satellite sea surface temperature, sea ice concentration, and in situ temperature and salinity vertical profiles are jointly assimilated to estimate the initial conditions... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00458/56993/58884.pdf |
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| Benshila, Rachid; Durand, Frederic; Masson, Sebastien; Bourdalle-badie, Romain; De Boyer Montegut, Clement; Papa, Fabrice; Madec,. |
| Salinity in the Bay of Bengal is highly heterogeneous, with extremely fresh waters found at the surface in the Northern part of the basin, and saltier waters at subsurface as well as to the south. This paper investigates the seasonal structure of sea surface salinity of the Bay in a regional high-resolution model forced by ERA-Interim reanalysis and various precipitation products. Surface circulation is believed to drive the spreading of northern Bay of Bengal fresh waters to the rest of the Indian Ocean. We first present a series of experiments to infer the sensitivity of modeled circulation to various numerical choices. Surface circulation is found to be sensitive to the horizontal resolution of the model, with the 1/12° version appearing much more... |
| Tipo: Text |
Palavras-chave: Salinity; Bay of Bengal; Export of fresh water plume; High resolution ocean modeling. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00168/27925/26199.pdf |
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| De Boyer Montegut, Clement; Durand, Fabien; Bourdalle-badie, Romain; Blanke, Bruno. |
| The barrier layer (BL) - a salinity stratification embedded in the upper warm layer - is a common feature of the tropical oceans. In the northern Indian Ocean, it has the potential to significantly alter the air-sea interactions. In the present paper, we investigate the spatio-temporal structure of BL in the Arabian Sea during summer monsoon. This season is indeed a key component of the Asian climate. Based on a comprehensive dataset of Conductivity-Temperature-Depth (CTD) and Argo in situ hydrographic profiles, we find that a BL exists in the central Arabian Sea during summer. However, it is highly heterogeneous in space, and intermittent, with scales of about similar to 100 km or less and a couple of weeks. The BL patterns appear to be closely associated... |
| Tipo: Text |
Palavras-chave: Barrier layer; Arabian Sea; Summer monsoon; ARGO; ASHSW. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00198/30959/29358.pdf |
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| Von Schuckmann, Karina; Le Traon, Pierre-yves; Smith, Neville; Pascual, Ananda; Brasseur, Pierre; Fennel, Katja; Djavidnia, Samy; Aaboe, Signe; Alvarez Fanjul, Enrique; Autret, Emmanuelle; Axell, Lars; Aznar, Roland; Benincasa, Mario; Bentamy, Abderrahim; Boberg, Fredrik; Bourdalle-badie, Romain; Nardelli, Bruno Buongiorno; Brando, Vittorio E.; Bricaud, Clement; Breivik, Lars-anders; Brewin, Robert J. W.; Capet, Arthur; Ceschin, Adrien; Ciliberti, Stefania; Cossarini, Gianpiero; De Alfonso, Marta; De Pascual Collar, Alvaro; De Kloe, Jos; Deshayes, Julie; Desportes, Charles; Drevillon, Marie; Drillet, Yann; Droghei, Riccardo; Dubois, Clotilde; Embury, Owen; Etienne, Helene; Fratianni, Claudia; Garcia Lafuente, Jesus; Garcia Sotillo, Marcos; Garric, Gilles; Gasparin, Florent; Gerin, Riccardo; Good, Simon; Gourrion, Jerome; Gregoire, Marilaure; Greiner, Eric; Guinehut, Stephanie; Gutknecht, Elodie; Hernandez, Fabrice; Hernandez, Olga; Hoyer, Jacob; Jackson, Laura; Jandt, Simon; Josey, Simon; Juza, Melanie; Kennedy, John; Kokkini, Zoi; Korres, Gerasimos; Kouts, Mariliis; Lagemaa, Priidik; Lavergne, Thomas; Le Cann, Bernard; Legeais, Jean-francois; Lemieux-dudon, Benedicte; Levier, Bruno; Lien, Vidar; Maljutenko, Ilja; Manzano, Fernando; Marcos, Marta; Marinova, Veselka; Masina, Simona; Mauri, Elena; Mayer, Michael; Melet, Angelique; Melin, Frederic; Meyssignac, Benoit; Monier, Maeva; Muller, Malte; Mulet, Sandrine; Naranjo, Cristina; Notarstefano, Giulio; Paulmier, Aurelien; Perez Gomez, Begona; Perez Gonzalez, Irene; Peneva, Elisaveta; Perruche, Coralie; Peterson, K. Andrew; Pinardi, Nadia; Pisano, Andrea; Pardo, Silvia; Poulain, Pierre-marie; Raj, Roshin P.; Raudsepp, Urmas; Ravdas, Michaelis; Reid, Rebecca; Rio, Marie-hélène; Salon, Stefano; Samuelsen, Annette; Sammartino, Michela; Sammartino, Simone; Sando, Anne Britt; Santoleri, Rosalia; Sathyendranath, Shubha; She, Jun; Simoncelli, Simona; Solidoro, Cosimo; Stoffelen, Ad; Storto, Andrea; Szerkely, Tanguy; Tamm, Susanne; Tietsche, Steffen; Tinker, Jonathan; Tintore, Joaquin; Trindade, Ana; Van Zanten, Daphne; Vandenbulcke, Luc; Verhoef, Anton; Verbrugge, Nathalie; Viktorsson, Lena; Wakelin, Sarah L.; Zacharioudaki, Anna; Zuo, Hao. |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00601/71276/71010.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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