• Radiocarbon in Seawater and Organisms from the Pacific Coast of Baja California

      Druffel, Ellen R. M.; Williams, Peter M. (Department of Geosciences, The University of Arizona, 1991-01-01)
      Radiocarbon was measured in dissolved inorganic carbon (DIC) and living organisms collected off the west coast of Baja California in October 1980. Samples from three locations were examined. Delta-14C of DIC at the southernmost station was higher than those further north, which reflects reduced upwelling in the southern region. Crabs and anchovies had Delta-14C values significantly lower than surface DIC Delta-14C, indicating the incorporation of ‘older', sediment-derived carbon sources from their diets. Comparisons are made between our DIC Delta-14C measurements and those obtained during other cruises and at a coastal site, from 1959 through 1987. Two distinct time histories of DIC Delta-14C are apparent for the post-bomb period: 1) a lower Delta-14C curve for sites close to the coast influenced by enhanced coastal upwelling; and 2) a higher Delta-14C curve for sites further offshore within the California Current.