1 Niveau de mer et masses deaux simulées par les Océans forcés: un premier bilan des problèmes entre satellites et OGCMs R. Bourdalle-Badie (Mercator Océan) C. Cassou (Cerfacs) N. Ferry (Mercator Océan) MH Rio (CLS) The Drakkar group
2 Vents diffusiométriques versus vents issus de danalyses météorologiques Vents diffusiométriques: CORE2: issu de la réanalyse NCEP2, mais la moyenne climatologique et le cycle saisonnier proviennent de Quickscat Vents issu danalyses / réanalyses météorologiques: ERA-Interim : assimilation de vents diffusiométriques mais contrainte forte de la physique du modèle atmosphérique Le vent est un forçage clé de la dynamique océanique, surtout dans les tropiques. Impact fort sur la surface moyenne de locéan (MDT)
3 Mean Dynamic Topography GOCE-TIMR3 : MSS CNES-CLS11 minus EGM-TIM-R3 MDT MDT accuracy is close 1~2 cm, largest errors< 5 cm in most areas MDT= imprint of the ocean circulation
4 Impact of CORE2 forcing on the MDT MDT difference: ORCA1 forced by CORE2 minus GOCE-TIMR3 45°S-45°N average of the MDT difference is 0 NEMO ORCA1° MDT: average simulation (C. Cassou, Cerfacs)
5 45°S-45°N average of the MDT difference is 0 Impact of ERA-Interim forcing on the MDT NEMO ORCA1° MDT: average simulation (C. Cassou, Cerfacs) MDT difference: ORCA1 forced by ERA-Interim minus GOCE-TIMR3
6 MDT difference: ORCA1/12° forced by CORE2 minus GOCE-TIMR3 45°S-45°N average of the MDT difference is 0 NEMO ORCA1/12° MDT: average. simulation by Drakkar group (M. Scheinert, IfM Kiel) Impact of CORE2 forcing on the MDT
7 45°S-45°N average of the MDT difference is 0 NEMO ORCA1/12° MDT average Simulation by Drakkar group (B. Barnier, JM Molines LEGI Grenoble) Impact of ERA-Interim forcing on the MDT MDT difference: ORCA1/12° forced by ERA-Interim minus GOCE-TIMR3
8 Difference ORCA1/12° CORE2 - ORCA1/12° ERA-Interim 45°S-45°N average of the MDT difference is average NEMO ORCA1/12° simulation Drakkar group IfM Kiel LEGI, Grenoble Impact of CORE2 / ERA-Interim forcing on the MDT cm
9 Impact of CORE2 on the MDT MDT POP 1° forced by CORE2 – Maximenko / Niiler MDT NCAR simulation cm
10 Impact of CORE2 / ERA-Interim on water masses Temperature difference with LEVITUS at 100m CORE2 ERA-Interim average
11 Impact of CORE2 / ERA-Interim on water masses Temperature difference with LEVITUS at 300m CORE2 ERA-Interim average