Biogeochemical Studies conducted in the OMEX Area during the Belgica Cruises: preliminary Results:I. Distribution of surface water properties: Transect OMEX.II Vertical distribution of water properties: Goban Spur. III. Transects across the continental margin: Goban Spur and Banc de La Chapelle. IV. Seasonal evolution of primary production: Banc de La Chapelle 1990-1993. V. Transects across the Iberian shelf Break:preliminary resultse