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Niveau de mer et masses d’eaux 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.

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Niveau de mer et masses d’eaux simulées par les Océans forcés: un premier bilan des problèmes entre satellites et OGCMsR. Bourdalle-Badie (Mercator Océan)C. Cassou (Cerfacs)N. Ferry (Mercator Océan)MH Rio (CLS) The Drakkar group

vents diffusiom triques versus vents issus de d analyses m t orologiques
Vents diffusiométriques versusvents issus de d’analysesmétéorologiques
  • Vents diffusiométriques:
  • CORE2: issu de la réanalyse NCEP2, maisla moyenneclimatologique etle cycle saisonnierproviennent de Quickscat
  • Vents issud’analyses / réanalyses météorologiques:
  • ERA-Interim: assimilation de vents diffusiométriquesmaiscontrainte forte de la physique du modèleatmosphérique
  • Le vent est un forçageclé de la dynamiqueocéanique, surtoutdans les tropiques.
  •  Impact fort sur la surface moyenne de l’océan (MDT)
mean dynamic topography goce timr3 mss cnes cls11 minus egm tim r3 mdt
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
impact of core2 forcing on the mdt
Impact of CORE2 forcing on the MDT
  • MDT difference:
  • ORCA1 forced by CORE2 minus GOCE-TIMR3

NEMO ORCA1° MDT:1993-2007 average

simulation

(C. Cassou, Cerfacs)

45°S-45°N average of the MDT difference is 0

impact of era interim forcing on the mdt
Impact of ERA-Interim forcing on the MDT
  • MDT difference:
  • ORCA1 forced by ERA-Interim minus GOCE-TIMR3

NEMO ORCA1° MDT:1993-2007 average

simulation

(C. Cassou, Cerfacs)

45°S-45°N average of the MDT difference is 0

impact of core2 forcing on the mdt1
Impact of CORE2 forcing on the MDT
  • MDT difference:
  • ORCA1/12° forced by CORE2 minus GOCE-TIMR3

NEMO ORCA1/12° MDT:1998-2007 average.

simulation by

Drakkar group

(M. Scheinert, IfM Kiel)

45°S-45°N average of the MDT difference is 0

impact of era interim forcing on the mdt1
Impact of ERA-Interim forcing on the MDT
  • MDT difference:
  • ORCA1/12° forced by ERA-Interim minus GOCE-TIMR3

NEMO ORCA1/12° MDT1998-2007 average

Simulation by

Drakkar group

(B. Barnier, JM Molines

LEGI Grenoble)

45°S-45°N average of the MDT difference is 0

impact of core2 era interim forcing on the mdt
Impact of CORE2 / ERA-Interim forcing on the MDT
  • Difference
  • ORCA1/12° CORE2 - ORCA1/12° ERA-Interim

1998-2007 average

NEMO ORCA1/12°simulation

Drakkargroup

IfM Kiel

LEGI, Grenoble

cm

45°S-45°N average of the MDT difference is 0

impact of core2 on the mdt
Impact of CORE2 on the MDT
  • MDT POP 1° forced by CORE2 – Maximenko / Niiler MDT

cm

NCAR simulation

impact of core2 era interim on water masses
Impact of CORE2 / ERA-Interim on water masses
  • Temperature difference with LEVITUS at 100m

CORE2

1993-2007 average

ERA-Interim

impact of core2 era interim on water masses1
Impact of CORE2 / ERA-Interim on water masses
  • Temperature difference with LEVITUS at 300m

CORE2

1993-2007 average

ERA-Interim