Charles Desportes, Marie Drévillon, Charly Régnier
(MERCATOR OCEAN/Production Dep./Products Quality)

Corinne Derval (CERFACS), Benoît Tranchant (CLS), Silvana Buarque (MERCATOR OCEAN), Christine Boone (CLS), Stéphanie Guinehut (CLS), Gaëlle Nicolas (CLS)

Eric Greiner, Mounir Benkiran, Nathalie Verbrugge (CLS), Charly Régnier, Fabrice Hernandez, Laurence Crosnier (MERCATOR OCEAN), Jean-Michel Lellouche, Olivier Legalloudec, Gilles Garric (MERCATOR OCEAN), Jean-Marc Molines (CNRS), Sébastien Theeten (Ifremer), Nicolas Pene (AKKA)

This bulletin gives an estimate of the accuracy of MERCATOR OCEAN’s analyses and forecast for the season of April-May-June 2010. It also provides a summary of useful information on the context of the production for this period. Diagnostics will be displayed for all MERCATOR OCEAN’s monitoring and forecasting systems currently producing daily 3D temperature salinity and current products. Finally we present a preliminary intercomparison of a few physical processes viewed by the operational systems and by ORCA12 (with and without data assimilation). The results show that the global ¼° and the Atlantic and Mediterranean 1/12° analyses and forecast still behave very similarly with an accuracy close to the expected levels (as defined in scientific qualification documents), except for the 1/12° displaying significantly better performance in the Mediterranean sea. Anyway this basin tends to be too warm in the model. The global 1/12° (in demonstration) displays at least as good performance and especially less biases than the current systems.