p. 187 - 199 EVOLUTION DES TEMPERATURES DE L'EAU A LA SURFACE, EN ETE 1990 (MAI-AOUT), AU LARGE DES COTES DE LA R.I. MAURITANIE Cornelia Maxim Institute Roumain de Recherches Marines Constanta Abstract The hydrological and meteorological observations carried out in the summer of 1990 continued to show the presence of all the elements which characterize a cold year, with intense upwelling. The cooling trend of the offshore Mauritanian waters noted since 1988 has been confirmed by the extension in time of the "passate" winds and water temperature of 15 degrees C southern to 17 degrees N lat.