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Geoid and high resolution sea surface topography modelling in the mediterranean from gravimetry, altimetry and GOCE data: evaluation by simulation

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Abstract

The determination of local geoid models has traditionally been carried out on land and at sea using gravity anomaly and satellite altimetry data, while it will be aided by the data expected from satellite missions such as those from the Gravity field and steady-state ocean circulation explorer (GOCE). To assess the performance of heterogeneous data combination to local geoid determination, simulated data for the central Mediterranean Sea are analyzed. These data include marine and land gravity anomalies, altimetric sea surface heights, and GOCE observations processed with the space-wise approach. A spectral analysis of the aforementioned data shows their complementary character. GOCE data cover long wavelengths and account for the lack of such information from gravity anomalies. This is exploited for the estimation of local covariance function models, where it is seen that models computed with GOCE data and gravity anomaly empirical covariance functions perform better than models computed without GOCE data. The geoid is estimated by different data combinations and the results show that GOCE data improve the solutions for areas covered poorly with other data types, while also accounting for any long wavelength errors of the adopted reference model that exist even when the ground gravity data are dense. At sea, the altimetric data provide the dominant geoid information. However, the geoid accuracy is sensitive to orbit calibration errors and unmodeled sea surface topography (SST) effects. If such effects are present, the combination of GOCE and gravity anomaly data can improve the geoid accuracy. The present work also presents results from simulations for the recovery of the stationary SST, which show that the combination of geoid heights obtained from a spherical harmonic geopotential model derived from GOCE with satellite altimetry data can provide SST models with some centimeters of error. However, combining data from GOCE with gravity anomalies in a collocation approach can result in the estimation of a higher resolution geoid, more suitable for high resolution mean dynamic SST modeling. Such simulations can be performed toward the development and evaluation of SST recovery methods.

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Authors and Affiliations

  1. DIIAR, Politecnico di Milano, Piazza Leonardo da Vinci, 32-20133, Milan, Italy

    R. Barzaghi

  2. DIIAR, Politecnico di Milano, Polo Regionale di Como, Via Valleggio, 11-22100, Como, Italy

    N. Tselfes

  3. Department of Geodesy and Surveying, Aristotle University of Thessaloniki, School of Rural and Surveying Engineering, University Box 440, 54124, Thessaloniki, Greece

    I. N. Tziavos & G. S. Vergos

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  1. R. Barzaghi
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  2. N. Tselfes
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  3. I. N. Tziavos
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  4. G. S. Vergos
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Correspondence to G. S. Vergos.

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Barzaghi, R., Tselfes, N., Tziavos, I.N. et al. Geoid and high resolution sea surface topography modelling in the mediterranean from gravimetry, altimetry and GOCE data: evaluation by simulation. J Geod 83, 751–772 (2009). https://doi.org/10.1007/s00190-008-0292-z

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