REGIONAL OCEAN TIDE LOADING MODELING AROUND THE IBERIAN PENINSULA

M. Benavent , J. Arnoso , F.G. Montesinos

We developed a new 1/12-degree resolution oceanic tide model in the complex region that surrounds the Iberian Peninsula. The model, named IBER01, allows us to obtain more accurate tidal loading computations for precise geodetic and gravimetric observations in this area. The modeling follows the scheme of data assimilation (coastal tide gauge, bottom pressure sensors and TOPEX/Poseidon altimetry) into a hydrodynamical model, which is based on two dimensional barotropic depth averaged shallow-water equations. Detailed bathymetry data and quadratic bottom friction with a specific drag coefficient for the region have been considered. Improved ocean load maps for the Iberian Peninsula are obtained for 8 harmonic constituents (Q1, P1, O1, K1, N2, M2, S2, K2), after computing the load effect (Newtonian attraction and elastic contribution) using IBER01 and six present-day global oceanic tide models for comparison. The results achieved verify the quality of the new model. Our ocean loading computations reduce considerably the discrepancies between the theoretical Earth tide parameters and those from observations at the level of 0.3%.

Mots clés: Oceanic model; tidal loading; Iberian Peninsula; Earth tide

M. Benavent, J. Arnoso, F.G. Montesinos. REGIONAL OCEAN TIDE LOADING MODELING AROUND THE IBERIAN PENINSULA. Journal of Geodynamics, 2009, 48 (3-5), pp.132. ⟨10.1016/j.jog.2009.09.023⟩. ⟨hal-00594436⟩