Now showing items 1-7 of 7

  • Application of a hybrid EnKF-OI to ocean forecasting 

    Counillon, François; Sakov, Pavel; Bertino, Laurent (Copernicus Publications on behalf of the European Geosciences Union, 2009-10-01)
    Data assimilation methods often use an ensemble to represent the background error covariance. Two approaches are commonly used; a simple one with a static ensemble, or a more advanced one with a dynamic ensemble. The latter ...
  • Evaluating two numerical advection schemes in HYCOM for eddy-resolving modelling of the Agulhas Current 

    Backeberg, Bjørn C.; Bertino, Laurent; Johannessen, Johnny A. (Copernicus Publications on behalf of the European Geosciences Union, 2009-06-02)
    A 4th order advection scheme is applied in a nested eddy-resolving Hybrid Coordinate Ocean Model (HYCOM) of the greater Agulhas Current system for the purpose of testing advanced numerics as a means for improving the model ...
  • The greater Agulhas Current system: an integrated study of its mesoscale variability 

    Backeberg, Bjørn C.; Johannessen, Johnny A.; Bertino, Laurent; Reason, Chris J.C. (The Institute of Marine Engineering, Science & Technology (IMarEST), 2008-02)
    For the purpose of developing an operational oceanography system for the greater Agulhas Current regime, a high resolution Hybrid Coordinate Ocean Model (HYCOM) has been set in a nested configuration. The intense and complex ...
  • The impact of ensemble filter definition on the assimilation of temperature profiles in the tropical Pacific 

    Leeuwenburgh, O.; Evensen, Geir; Bertino, Laurent (Royal Meteorological Society, 2005-10)
    The traditional analysis scheme in the Ensemble Kalman Filter (EnKF) uses a stochastic perturbation or randomization of the measurements which ensures a correct variance in the updated ensemble. An alternative so called ...
  • Ocean data assimilation systems for GODAE 

    Cummings, James; Bertino, Laurent; Brasseur, Pierre; Fukumori, Ichiro; Kamachi, Masafumi; Martin, Matthew J.; Mogensen, Kristian; Oke, Peter; Testut, Charles Emmanuel; Verron, Jaques; Weaver, Anthony (The Oceanography Society, 2009-09)
    Ocean data assimilation has matured to the point that observations are now routinely combined with model forecasts to produce a variety of ocean products. Approaches to ocean data assimilation vary widely both in terms ...
  • Seasonal-to-decadal predictions with the ensemble kalman filter and the Norwegian earth System Model: A twin experiment 

    Counillon, Francois; Bethke, Ingo; Keenlyside, Noel; Bentsen, Mats; Bertino, Laurent; Zheng, Fei (Co-Action Publishing, 2014-03-10)
    Here, we firstly demonstrate the potential of an advanced flow dependent data assimilation method for performing seasonal-to-decadal prediction and secondly, reassess the use of sea surface temperature (SST) for initialisation ...
  • Validation and intercomparison studies within GODAE 

    Hernandez, F.; Bertino, Laurent; Brassington, Gary; Chassignet, E.; Cummings, James; Davidson, Fraser; Drévillon, M.; Garric, Gilles; Kamachi, Masafumi; Lellouche, J.-M.; Mahdon, R.; Martin, Matthew J.; Ratsimandresy, A.; Regnier, C. (The Oceanography Society, 2009-09)
    During the Global Ocean Data Assimilation Experiment (GODAE), seven international operational centers participated in a dedicated modeling system intercomparison exercise from February to April 2008. The objectives were: ...