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Evaluation of real time and future global monitoring and forecasting systems at Mercator Ocean 5
Lellouche, Jean-michel; Le Gallouedec, O.; Drevillon, Marie; Regnier, C.; Greiner, Eric; Garric, Gilles; Ferry, N.; Desportes, C.; Testut, Charles-emmanuel; Bricaud, C.; Bourdalle-badie, R.; Tranchant, B.; Benkiran, Mounir; Drillet, Y.; Daudin, A.; De Nicola, C..
Since December 2010, the global analysis and forecast of the MyOcean system consists in the Mercator Océan NEMO global 1/4° configuration with a 1/12° "zoom" over the Atlantic and Mediterranean Sea. The zoom open boundaries come from the global 1/4° at 20° S and 80° N. The data assimilation uses a reduced order Kalman filter with a 3-D multivariate modal decomposition of the forecast error. It includes an adaptative error and a localization algorithm. A 3D-Var scheme corrects for the slowly evolving large-scale biases in temperature and salinity. Altimeter data, satellite temperature and in situ temperature and salinity vertical profiles are jointly assimilated to estimate the initial conditions for the numerical ocean forecasting. This paper gives a...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00129/23983/21940.pdf
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Evolution of the Arctic Ocean Salinity, 2007-08: Contrast between the Canadian and the Eurasian Basins 5
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...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00035/14637/11946.pdf
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Recent updates to the Copernicus Marine Service global ocean monitoring and forecasting real-time 1∕12° high-resolution system 5
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...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00458/56993/58884.pdf
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