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GOCE Validation via Ocean State Estimation

Vanya Romanova(1), Armin Koehl(1), Detlef Stammer(1) and Frank Siegismund(1)

(1) Universitaet Hamburg, Bundesstr. 53, 20146 Hamburg, Germany


This poster will summarize ongoing ocean syntheses that brings together altimetric and geoid fields, in situ data and a numerical model using data assimilation and its use for geoid validation efforts. Over the last decade, ocean data assimilation has made a remarkable progress, to the point that it is now feasible to perform mathematically rigorous global ocean data synthesis in a routine manner as a core strategy for climate research. In analogy to atmospheric re-analysis, this effort sometimes is referred to as reanalysis. However, in the absence of analyses in the ocean, the term data synthesis seems more appropriate.

To date, several ocean syntheses are being run routinely over the period 1992 through present. Applications of syntheses range from mesoscale and coastal ocean state estimates to the ocean as part in climate system with applications ranging from estimating ocean transports, mixing, surface fluxes to impacts on biogeochemistry.

Results will be presented that illustrate the use of ocean data assimilation in testing the consistency of existing geoid information and their error bars. We will also show recent results that illustrate the impact of modern GRACE geoid fields in improving estimates of the ocean mean and time-varying circulation. Resulting fields will be compared with existing bottom pressure time series to investigate the quality of the estimation results, to investigate the possible impact of new geoid fields for ocean state estimation, and to discuss the impact of ocean state estimation for geoid validation efforts.


Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry