An ocean modelling and assimilation guide to using GOCE geoid products

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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  • Author: Haines, K.

    Reading University, Environmental Systems Science Centre

  • Author: Johannessen, J. A.

    NERSC, Nansen Environmental and Remote Sensing Centre

  • Author: Knudsen, Per

    Geodesy, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Lea, D.

    Met Office

  • Author: Rio, M. -H.

    CLS DOS, Collecte Localisation Satellites

  • Author: Bertino, L.

    NERSC, Nansen Environmental and Remote Sensing Centre

  • Author: Davidson, F.

    DFO-NAFC MPO-NAFC

  • Author: Hernandez, F.

    Mercator Ocean/ IRD

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We review the procedures and challenges that must be considered when using geoid data derived from the Gravity and steady-state Ocean Circulation Explorer (GOCE) mission in order to constrain the circulation and water mass representation in an ocean general circulation model. It covers the combination of the geoid information with time-mean sea level information derived from satellite altimeter data, to construct a mean dynamic topography (MDT), and considers how this complements the time-varying sea level anomaly, also available from the satellite altimeter. We particularly consider the compatibility of these different fields in their spatial scale content, their temporal representation, and in their error covariances. These considerations are very important when the resulting data are to be used to estimate ocean circulation and its corresponding errors. We describe the further steps needed for assimilating the resulting dynamic topography information into an ocean circulation model using three different operational forecasting and data assimilation systems. We look at methods used for assimilating altimeter anomaly data in the absence of a suitable geoid, and then discuss different approaches which have been tried for assimilating the additional geoid information. We review the problems that have been encountered and the lessons learned in order the help future users. Finally we present some results from the use of GRACE geoid information in the operational oceanography community and discuss the future potential gains that may be obtained from a new GOCE geoid.
Original languageEnglish
JournalOcean Science
Publication date2011
Volume7
Journal number1
Pages151-164
ISSN1812-0784
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 7
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