engleski

The Geomed2 project: the Geoid and DOT of the Mediterranean Sea

The main scope of the GEOMED2 project is the determination of a high-accuracy and high-resolution geoid and DOT models for the Mediterranean Sea. The processing methodology is based on the well-known remove-compute-restore procedure and both stochastic and integral/spectral methods for the determination of the geoid and the rigorous combination of heterogeneous data. All the available gravity observations for the wider Mediterranean basin were collected, validated, homogenized and unified in terms of their horizontal coordinates and gravity systems, so as to derive a reliable gravity data base to be used for the determination of the geoid. Particularly, marine gravity were track by track debiased in order to remove existing inconsistencies among the different gravity campaigns. Base on the collected data, the geoid has been computed in the wider Mediterranean area, i.e. in the area bounded between 30° < φ < 48° -10° < λ < 40°. The available gravity data have been gridded on a regular 2’ x 2’ grid in the computation area employing ordinary kriging, servicing both as input to the geoid estimation methodologies and as a project deliverable to be disseminated as a new approximation of the gravity field over the Mediterranean. Fast-collocation, 1dFFT and 2dFFT employing the original Wong-Gore modified Stokes kernel and the KTH methods have been applied in order to get the geoid estimate. The different geoid estimates have been then compared with altimeter data to obtain different estimates of the Dynamic Ocean Topography (DOT), which will allow the definition of the currents pattern in the Mediterranean Sea.

Geoid ; Mediterranean Sea ; GEOMED

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